Devices for testing and in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools (E21C39)
E21C39 Devices for testing ; in situ the hardness or other properties of minerals, e.g. for giving information as to the selection of suitable mining tools(1663)
FIELD: transportation.SUBSTANCE: method involves the implementation of thermal electric drilling of wells in ice. Simultaneously with the drilling, melt water is sucked from the edge of the working part of the heating crown, which is fed through the hose to the ice surface to the salinity meter, and the drilling speed and salinity of the melt water are recorded on the computer or logger. In further processing of the records the drilling speed is compared with the salinity of melt water, taking into account the time of water passing from the well through the hose to the salinity meter. And the drilling speed, corresponding to the transition of a drill rod from dense ice to lose ice or void and which is the closest to the sharp increase in the salinity of water drained due to the large differences in salinity of melt ice and sea water, increases, is determined as the drill rod coming out of the consolidated layer and the depth of location of its lower boundary is recorded.EFFECT: creation of a method for determining the location of the lower boundary of the consolidated layer.1 cl
FIELD: machine engineering.SUBSTANCE: device contains a hollow body in the form of a pipe, to the upper end of which is attached a drill hose, supplying a hot water to the body, a drill bit is attached to the lower end of the body. The drill bit consists of a tip and a bush. The tip has a small parabolic sharpening about one centimetre in length from the outside and a conical bore inside. The bush with an axial hole along its entire length has a conical groove outside at the bottom and a conical groove inside, on the outside of the conical surface of the bush the rectangular grooves are cut in the form of thread. The tip is attached to the body by means of a thread. The bush is mounted coaxially in the tip. The conical surface of the bush enters the cone hole of the tip so that their ends are flush at the same level, while the grooves on the conical surface of the bush form channels for discharging water from the bit in the form of spread, swirling jets. The bush is pressed against the tip by means of a spring held in place by a nut screwed into the upper part of the tip and has a free move upward with increasing clearance between its outer conical surface and the inner conical surface of the tip.EFFECT: sensitivity is increased to determine the position of the boundaries and the dimensions of voids in ice piles while maintaining a high drilling speed.2 cl, 3 dwg
FIELD: mining engineering.SUBSTANCE: device comprises a frame of sidewalls, beams and stand connected to a closed circuit, a beam installed in the center of the frame, and loading mechanisms. The loading mechanisms are made in the form of vertical and horizontal hydraulic jacks with dynamometers installed leaning against the beam mounted in the frame center and the frame stand, respectively, it is also provided with a plate which is installed horizontally on the surface of the array of crushed rocks and connected by strings with instrumentation for registering vertical deformation of the array, a carriage mounted on the plate configured for horizontal movement, inside which a compression ring with a stamp is fixed. A second horizontal plate, a second carriage on ball bearings, a hydraulic jack and a dynamometer are arranged in series on the stamp of the compression ring and connected to the central beam of the frame, wherein the stamp is connected to instrumentation for registration of its movements.EFFECT: increased efficiency and reliability for determination of Poisson factors and transverse deformation of fragments of crushed rock array and compressibility of rock in the array.2 dwg
FIELD: oil and gas industry.SUBSTANCE: electro-thermal well drilling is performed in ice along with recording on a computer or a drilling speed logger. Simultaneously with drilling, suction of the meltwater heating crown from the edge of the working zone is carried out and then it is supplied onto the ice surface to the location of the drill operator. The operator visually monitors the presence and intensity of the fluid flow, recording the transition from the air-water mixture to the constant fluid flow by marking the drilling speed in the computer register by pressing a special button. The dependence of the drilling speed is compared with the operator's mark on the presence of a constant flow of water, taking into account the time of water passing from the well through the hose to the outlet of the pump. The change in drilling speed, corresponding to the transition of a drill from dense ice to loose ice or the void closest to the mark, is defined as the drill exit from the consolidated layer and the depth of the bottom boundary of the consolidated layer is established.EFFECT: determination of the depth of the bottom boundary of the consolidated layer for non-core drilling.2 cl
FIELD: mining engineering.SUBSTANCE: extracted depth reference benchmark includes an estuarial tube, base and locking plugs connected to the indicators by steel cables. In this case, the estuarial tube is made of galvanized spring material along the diameter of hole, has a slot for its easy insertion into hole, protrudes on the 50-70 mm from hole to the level of fixing the worked out space in light and is the reference point for roof displacement for base and locking indicators. Base and locking plugs are made of spring wire, rolled up in the form of spirals with diameter D=8-10 mm with diluted ends of length L=12-14 mm at an angle α=145-155°, directed into the depth of hole. At the same time, the carrier steel cables of displacement indicators are pivotally mounted on the lower part of the spirals, keeping them on weight; and on the upper part ropes for extracting the plug from hole are mounted, the lower ends of which are fixed on corresponding displacement indicators diametrically opposite to the carrier cables, and have different colours. Displacement indicators are performed from the tubes entering into each other in the sequence of open-casts arrangement, have measuring scales, and, at the ends, openings for releasing and securing ends of cables and adjusting the position of indicator relative to estuarial tube.EFFECT: simplification of measurements and design of reference benchmark and possibility of its reuse.2 dwg
FIELD: mining engineering.SUBSTANCE: device for monitoring roof separation layer on the basis of fiber grid consists of a perpendicular measuring barrel (1) installed in hole drilled in the roof, and an layout case of equipment layout (19) connected from below to the perpendicular measuring barrel (1). Mounting brackets (6) of guide roller and mounting brackets (7) of roller with steel tape are symmetrically mounted on the upper part of layout case (19), and socle beams (15) of constant strength are symmetrically mounted on the lower part. Tension springs (16) are installed on opposite ends of socle beams (15) of constant strength. The other ends of two tension springs (16) are connected to steel wire rope (3). Steel wire rope (3) passes through rollers (17) with steel tape and guide rollers (18), and extends outward from fair-lead (2) of steel wire rope at the top of perpendicular measuring barrel (1). End head of steel wire rope (3) is connected to anchor head (5). Fiber grids A (8) and fiber grid B (9) are symmetrically mounted on the left sides and right sides of the socle beams (15) of constant strength. Fiber grids A (8) and fiber grids B (9) exit outwardly from fiber fair-lead (10) through the same fiber (12) and are connected to the fiber connector (14). Also, method for monitoring roof separation layer on basis of fiber grid in mining operations using a device for monitoring roofing separation layer on basis of fiber grid in mining operations.EFFECT: increasing safety due to higher monitoring efficiency and measurement accuracy.7 cl, 7 dwg
FIELD: measuring equipment.SUBSTANCE: device for measuring ground deformation relates to the field of measuring equipment, particularly to the method of measuring the relative displacements of two points on the ground surface or selected areas of the engineering and construction structures, spaced at the considerable distances occurring due to exposure to exogenous and natural processes. The device for measuring the ground deformation consists of a rope 1 fixed to the anchor 2, which, having passed the route bends, falls onto the shaft 4 of the motor 5 through the mobile unit 3 with a large reduction ratio and the angle sensor of the shaft rotation. The motor is fixed to the housing base 5 of the device measuring system. There are always a few rope turns on the motor shaft 4, that is provided by the braked buffer coil 6 with a sufficient rope reserve capable of measuring even with significant anchor movements. The device for measuring the rope tensile force 7 is introduced in the system, by which the rope tensile force is measured. Voltage from the device for measuring the rope tensile force 7 is input to the signal processing unit 8, the output of which is connected to the input of the motor controlling unit 9, where the difference signal is formed between the digital signal from the device for measuring the rope tensile force and introduced into its memory with a value corresponding to the particular threshold force value F0 - the predetermined small tensile force. The outputs from the unit 9 are connected respectively to the motor 5 and the signal converting unit 10 from the motor controlling unit by the value of the anchor movements. Calculation of the anchor movement values is carried out in the output signal converting unit 10 from the unit 9 by the value of the anchor movements. An encoder 11 is introduced into the measuring circuit to obtain an independent information about the anchor movements, connected to the input of the signal converting unit 12 from the encoder by the value of the anchor movements. The outputs of the units 10 and 12 are connected to the input of the signal comparing unit 13, in which conclusion on the danger degree of the developing processes is made based on the data analysis of the deformation values and due to the geological features of the observation object.EFFECT: improving the measurement accuracy.1 dwg
FIELD: measurement equipment.SUBSTANCE: method involves samples testing till destruction. Samples are produced from the monoliths of the tested material, then they are test for monoaxial tension, compression, and in terms of triaxial stress state. These data are used to build a strength passport with envelope of Mohr's circle of stress limit. Main crack surface roughness (Rz) value is measured for each type of rock stress state based on which the roughness (Rz) change nomogram is constructed for the material destruction main crack surface, depending on the main normal stresses value σin the destruction crack zone. Then, a sample is taken from the area of the main crack of the building structure tested material destruction, and there roughness value Rz1 is measured of the destruction main crack surface through which, using a nomogram obtained, the value is determined of the maximum normal stresses σn.r. The point of the tested material limit state is determined, for which in the vertical axis of the material strength passport a value is set of the maximum normal stress acting in the zone of material destruction of σn.r. and from this point a perpendicular is put to the envelope of Mohr's circles of stress. Using the material limit state point, a Mohr's circle of stress is built for the tested sample of the destroyed structure element, and according to it, principal normal stress values σ2p and σ1p are determined and the material stress state type is defined in which the structure element was destroyed.EFFECT: improved accuracy of stress state assessment of materials that make up the structure, improved reliability of its operation.3 cl, 4 dwg
FIELD: mining.SUBSTANCE: method involves drilling wells and holes in underground mines. A measuring set with a video endoscope fixed at its end and a perspective ruler fixed at a distance of the wide-angle visual angle of the video vision of the video endoscope is inserted into the well. The exact position of the cracks is determined by the depth of the well and its approximate width, the location of the cracks found in the well is fixed along the length of the rod, and the video endoscope and the prospective ruler determine their approximate width, fix them in the observation log, cracks are classified by width. For each class, a measuring cone-probe with a certain step of the measuring rifled steps and their diameter is selected. Cone-probe, anchored on the rod, is injected into the mouth of the measured crack and on the diameter of the steps and their number, depth move hidden areas in rift, define the breadth and depth of its disclosure. Repeated cycles of measurements are carried out according to the classification of previously measured cracks and from the changes in crack opening width determine the dynamics of rock mass deformation processes. The device contains a measuring probe, made in the form of a removable cone-probe, in which completed mounting hole for fastening to the typesetting of the measuring rod, and by forming a cone cut measuring steps, the rod is a rod set with elements of articulation with each other. Measuring steps threaded cone-probe performed with step on its axis in ascending order from h=0.5 mm, with diameters from stages d=1 mm in width measured cracks. At the end of the set of rods, a video endoscope is installed, and a perspective ruler is attached at a distance of the wide-angle visual angle of the video endoscope capture.EFFECT: increasing the accuracy of measurements.3 cl, 5 dwg
FIELD: mining engineering.SUBSTANCE: submersible meter of rock destruction energy efficiency includes a hydraulic cylinder, loading piston with a rod equipped with an indenter. In this case, the hydraulic cylinder contains an intermediate rod connected to two pistons: external and internal, which divide the hydraulic cylinder into four cavities: inlet, middle, pressure and power. In this case, the middle cavity has an outlet to the atmosphere through a window in which a pusher is placed interacting with a stop located on the intermediate rod of the hydraulic cylinder and connected to a movable wedge which is in communication with the hydraulic cylinder body by means of a spacer spring. Between the pressure and the power cavity, hydraulic communication is provided through a channel.EFFECT: increasing the accuracy of determining the energy efficiency of rock destruction, simplifying the operator's work during research.1 dwg
FIELD: mining.SUBSTANCE: scanning is performed by ultrasonic stationary noise signals with the average equal to zero mass sections, located between parallel wells along its depth. The ultrasonic signals reception is carried out by two acoustic transducers, which at each of the scanning sections are located symmetrically relatively to the axis of the emitted acoustic transducer radiating pattern main lobe. Measure the correlation intervals and the cross-correlation coefficient of the signals from the receiving transducers outputs, increasing its clamping force to the well wall until the measured correlation intervals increase is stopped. The values of the measured cross-correlation coefficient are fixed after reaching the specified moment in each section and the graph of this coefficient versus the depth is plotted. The depth, from which the cross-correlation coefficient obtains the constant value, is taken as the abutment pressure zone limits, and the depth, from which the cross-correlation coefficient is less than the specified value, is taken as the stress relief zone limit. The depth, at which the maximum value of the cross-correlation coefficient takes place, corresponds to the maximum stress in the abutment pressure zone.EFFECT: determination of the stresses spatial distribution in the vicinity of the mine workings and the abutment pressure zone maximum depth.3 dwg
FIELD: mining.SUBSTANCE: stabilometer for testing the rock samples contains a sample chamber, a load cylinder with a piston, a pressure sources connected to the chamber and the cylinder, and stabilization loading slide valve, mounted in the piston and fixed by a threaded sleeve at the base of the cylinder. There is the cavity in the piston, where the support sleeve is located, connected to the slide valve and contacting the piston shoulders. There is the drain hole in the load cylinder, where the shut-off control valve with electrical motor is installed, it is electrically connected with the electronic extensometer, the extensometer housing is fixed inside the loading cylinder on the shoulders, and the measuring rod of the extensometer brought out through the hole in the shoulders to the cavity of the piston and contacting the bearing sleeve.EFFECT: improved accuracy of rocks dimensional tests by eliminating inaccuracy, connected to the potential elastic power of the working fluid when it is compressed, and reduction of negative impact of the cylinder, piston and plunger device siltation.1 dwg
FIELD: mining engineering.SUBSTANCE: invention relates to mining engineering and is intended to control the stress-strain state (SSS) of the rock mass, including those having a block structure, and can be used to estimate and forecast the stability of mine workings in the manufacture of mining operations. The way in which the controlled area on the well is being drilled from underground mines in the contour direction of working space. A bleeding core shall be selected, the analysis of which determines the size, location of the natural units in the rock mass and the boundaries between them. One shall carry out the test of bleeding core selected for each type of rock at the borehole depth and determine the value of the maximum allowable elastic deformation of this type of rock. One shall mount benchmarks along the longitudinal axis of the well within the natural blocks. Benchmarks mount places shall be selected in proximity to the boundaries of the natural blocks, and in the absence of the latter - after a certain interval of the well depth. The far benchmark shall be fixed near the contour of the working space. One shall measure the value of displacements between adjacent benchmarks along the longitudinal axis of the well. In addition, one shall measure the values of the displacement of each benchmark along the longitudinal axis of the well relative to the conductor, which is used in calculating the value of deformation of the rock mass, being rigidly fixed to the wellhead, for which each of the benchmarks is equipped with an autonomous flexible coupling, such as stainless steel string, one end of which is fixed on a benchmark and the other end is brought out from the measuring unit mounted on the conductor and is connected to a tensioning device for continuous tensioning of flexible connection with the tensioning device is movable along it. After measuring the displacements, it is the basis for calculation the value of deformation of rock massif and deformations - for the parameters of elastic or inelastic deformations, which are to evaluate SSS rock massif changes at the controlled area. Moreover, the parameters of elastic or inelastic deformations of natural blocks of rock massif shall be determined by comparing the obtained values of deformations of the rock massif to the maximum allowable size of the elastic deformation of this type of rock. Then one shall fix their localization zones, define the parameters of these zones. A beginning of the active phase of rock deformation in zone of inelastic deformation and its duration, up to the collapse of a near circuit massif into worked space, shall be set on those benchmarks on which one records values of the displacement with respect to the conductor with continuous speed. The value of maximum allowable displacements of benchmarks at which there is a collapse of near circuit massif shall be determined when the flexible connection failure of any of the benchmarks, and it is used to forecast future collapses of adjacent roks to the waste space in the subsequent monitoring of SSS on working benchmarks.EFFECT: invention provides increased positioning accuracy of localization of deformation zones.1 dwg
FIELD: data processing.SUBSTANCE: method consists in fact that managing-recording server records oscillations measuring signals from three-dimensional geophone measuring probes installed in entries adjacent to longwall face, synchronously spatially oriented in all measuring channels and in synchronized time interval, as well as in close correlation with signals, informing on cleaning machine operation mode and location in working face and on this basis, during interaction with server localizes seismic phenomena. After cutter-loader each cut cutting analysis of relative changes of stress in coal massif is carried out in front of mining face front by seismic amplitude tomography weakening-attenuation using recorded wave energy. After cutting when loader is stationary, performing active seismic speed or amplitude tomography by illumination of rock mass between gates adjacent to longwall by means of seismic waves, caused by actuation of remote launched from mine surface, by means of converting server pulse oscillations exciters. Stress analysis is performed by passive seismic velocity or amplitude tomography method, using translucent seismic wave shocks as source of vibrations, caused by mining development.EFFECT: then stresses relative changes concentration averaged tomographic map is periodically complied, and separate types of tomography maps are complied.6 cl, 4 dwg
FIELD: geology.SUBSTANCE: invention relates to determination of distribution region, dimensions and geometry of fractures and systems of fractures formed as a result of hydraulic fracturing, more specifically relates to a method and device for creation of microseismic events inside fractures and systems of fractures. Method of mapping of fractures within hydrocarbon-containing subterranean formation zone, through which well extends in a first version comprises pumping a group of particles of centres of connection in fractures of subterranean formation. Selective connection of first reactive particles to particles of centres of connection. Pumping of group of first reactive particles into fractures. Pumping group of second reactive particles into fractures after pumping first reactive particles. Induction in fractures of group of reactions with participation of group of first and second reactive particles. Creating a group of microseismic events as a result of reactions. In a second version, method includes pumping a group of first reactive particles in fracture zone of subterranean formation, pumping group of second reactive particles in fracture after pumping first reactive particles. Selective connection of second reactive particles to first reactive particles. Induction in fractures of group of reactions with participation of a group of first and second reactive particles and creating a group of microseismic events as a result of reactions. In a third version, method includes pumping group reactive particles in fractures of zone of subterranean formation. Each reactive particle contains at least two materials initially separated by a partition. Removal of partition and creation of a group microseismic events in locations of fractures in reactive particles through reaction between at least two materials.EFFECT: technical result is improvement of accuracy and safety of determining sizes and geometry of fractures.32 cl, 20 dwg
FIELD: mining.SUBSTANCE: invention relates to mining industry and can be used at open development of carbonate deposits for the purpose of complex preparation for processing mineral stock. Taking into account preliminary estimation based on acoustic fracturing indicator, specific transformation component is determined additionally for each unit by selecting zones in the direction and depth of fractures by means of sections profiling with determination of the propagation speed of longitudinal, transverse elastic waves in the units and depending on the density, distinguishable strength and thermophysical properties of the selected zones by means of software for specifying the direction of stratification, type of carbonate rocks and prediction of energy impact parameters on the selected unit zones, then it is performed, leaving the integrity of strong rock blocks, first, selective extraction of specified units zones for producing chips of various grades and carbonate raw material with the help of jib pit machine, then recess of strong rock blocks is made.EFFECT: technical result consists in improvement of production efficiency and complexity of carbonate mineral stock, differentiation of the obtained product with increase in its commercial cost, increase in safety, reliability of operations and reduction of capital costs.1 cl
FIELD: mining.SUBSTANCE: invention relates to mining and can be used for determining the direction of action and values of primary stresses in rock mass, evaluation of stress-strain state of mine rock massif, detection of location zones of rock damage and nature of their propagation in underground mining of mineral deposits. Method involves drilling of wells or boreholes in underground mine workings with length from 5 m, with diameter from 40 mm. On internal surface of wells marks are applied in the form of circle with marker or paint. Position of the video endoscope camera relative to horizon is determined, direction of deformation of horizontal and inclined wells, shifts and orientation of cracks are determined with video endoscope in examined wells. Obtained images efficiently determine minimum diameter of the well, the direction of which corresponds to the direction of maximum stresses in rock massif. At the specified parameters are determined images circuits d1, d2, the direction of maximum compression well indicates the direction of action of maximum stresses σ1. Following values are determined: angle α between the vertical and the direction of maximum stresses, angle β between image vertical and the direction of action of maximum stresses, thrust slip ΔH.Graphic image of the analyzed sections is plotted with tracing of, for example, site deformation or slip scheme. Well deformation is determined depending on d1 - initial well diameter, d2 - minimum diameter of the well under deformation and K1 - empirical coefficient taking into account physical and mechanical properties of rocks and structural forest renewal changing massif in direction of maximum stress.EFFECT: technical result consists in improvement of accuracy of determination of the direction of main stresses, enhancing security and efficiency of field development.1 cl, 3 dwg
FIELD: measuring equipment.SUBSTANCE: group of inventions relates to measurement equipment and can be used to assess quality of iron-ore material during production using mining loading devices, mainly excavators and frontal loaders. Method of iron-ore material quality controlling opening is formed in bucket wall, which on inner side of bucket is closed with plug made of nonmagnetic material. In area of formed cavity magnetic field is created by means of permanent magnet with axial magnetization. Measurement of magnetic field variation during bucket filling with rock is performed by means of two digital magnetometers, installed symmetrically relative to magnet in plane, perpendicular to axis of magnet and passing through its center, with opposite oriented measuring axes. Composite signal of magnetometers is transmitted over wired or wireless communication channel on located in mining loading facility cabin and/or control station receiving device, in which according to magnetometers readings correspondence table and iron content percentage content of iron in material is determined, present in bucket. If iron content is not less than specified one, then material in bucket is referred to ore and only when it runs on loading.EFFECT: technical result is aimed at increasing efficiency of mining loading facility by assessing quality of iron-ore material directly in bucket of loading facility with accuracy, providing referring material to ore or rock.17 cl, 5 dwg
FIELD: test equipment.
SUBSTANCE: invention relates to test equipment, to devices for testing materials, in particular, rocks, in analysis of energy interchange in rock mass in order to forecast and prevent dangerous dynamic phenomena. Test bench of energy interchange in blocks of rocks containing a frame, arranged on a frame a platform for sample, platform shifting mechanism, grip for counter-sample and associated mechanism of interlinked pressing of sample and counter-sample. According to invention it is equipped with L-shaped support platform, an additional gripper for additional counter-sample and extra mechanism for interlinked pressing of additional counter-sample and sample, connected with additional gripper for counter specimen, at that the carriage has L-shape and is installed on the support platform to interact with both walls of the support platform. Proposed test bench provides carrying out of tests in new conditions-at action of pressured load as in one, as well as in two directions, oriented at an angle to each other, which enables to simulate energy interchange at action of both gravity and tectonic forces.
EFFECT: this significantly broadens volume of information at investigation of energy interchange in blocks of rock.
1 cl, 2 dwg
FIELD: mining.SUBSTANCE: group of inventions can be used to assess stressed condition of rocks in a rock massif and different structures, such as dams. Method includes installing a device for implementing said method in a rock mass through a well. Method includes determination in a given plane stress values in three directions, oriented at an angle of 120° relative to each other, based on which distribution of stresses is determined in a given plane and stress condition of rocks is assessed. Method includes, in rock mass through well, creating a spherical cavity, which is filled with a solution which solidifies and expands during solidification. Device for implementing method is installed in centre of spherical cavity. Stress distribution is determined in two more planes, which together with first plane form three orthogonal planes passing through centre of spherical cavity. Stress distribution is then presented on orthogonal planes in form of ellipses, on which, as in three projections on orthogonal plane, an ellipsoid is constructed. Further, stress condition of rocks is evaluated based on orientations and numerical values of semi-axes of ellipsoid. Device has a measurement system with force sensors and a recorder. Measuring system is in form of a sphere with radial holes arranged in orthogonal planes passing through centre of sphere. Radial holes are located at an angle of 120° relative to each other in each of said planes. Rods are inserted into said holes. Force sensors are installed between rods and bottom of said holes.EFFECT: control from one point of spatial stress distribution, easier operation and simplified design of device.8 cl, 3 dwg
FIELD: mining.SUBSTANCE: invention relates to investigation of mechanical properties of rocks. Device for determining power consumption of destruction of rocks comprises bed, perforated barrel to accommodate testing rock samples, punch and loading hydraulic cylinder. At that, perforated barrel is installed relative to bed through thrust and radial bearings, and through spline joint is connected with handle for rotation of barrel.EFFECT: technical result consists in simplifying the process of measurement of power consumption due to possibility of removal of fractions of broken rock by means of rotation of perforated barrel.1 cl, 1 dwg
FIELD: test equipment; mining.SUBSTANCE: invention relates to devices of energy interchange at deformation and destruction of block of rock mass. Test bench comprises support frame, with arranged in it sample and counter-sample grippers, hydraulic mechanism of mutual pressing samples, connected with hydraulic mechanism of reciprocal displacements of samples, connected with counter specimen gripper, hydraulic energy accumulators connected with mechanisms of pressing and displacement, pressure sources connected with appropriate storage batteries, pressure pulsators connected with appropriate storage batteries and arranged in form of hydraulic cylinders with rods, which below piston cavity is connected with appropriate storage batteries, cams, kinematically connected with hydraulic cylinder rods, cams rotation shafts and shafts rotation drives. Shafts are aligned, and test bench is equipped with electromagnetic couplings for connection of shafts with appropriate drives and electromagnetic coupling for connection of shafts between themselves.EFFECT: expansion of scope of information at investigation of energy exchange by providing tests both at independent pulsation pressing and moving loads and synchronous pulsation with smooth and stepped change of pulsation frequency to control displacement of pulsation cycles during tests.1 cl, 1 dwg
FIELD: mining.SUBSTANCE: invention relates to mining and can be used for evaluation of stress-strain state of mine rock massif, detection of location zones of rock damage and nature of their propagation to ensure stability of exposures of mine workings and working excavation in underground mining of mineral deposits. Downhole method for determining damaged rock zones involves drilling of wells and bore pits in underground mine workings with diameter of ⌀40÷100 mm and more, with length of 5÷10 m and more. On well walls layer of lime, water-emulsion paint or gypsum is applied. Using photo and video recording equipment negative image of well is produced, from which structural broken condition of investigated mass is determined, distribution of zones of rock damage, and processes of displacement and deformation of mine rock mass.EFFECT: technical result consists in improvement of efficiency and safety of mining operations at development of solid mineral deposits by evaluation of structurally disturbed and seam liable to rock masses, prediction of development of deformation processes.1 cl, 3 dwg
FIELD: mining.SUBSTANCE: device is a welded structure of tower type installed on the top pre-graded site of excavated pit with providing of vertical stability. Its top part has a receiving hopper, then a grid-iron shaking sieve, a sector shutter, a punched swinging deck, an air distributing loop and two receiving hoppers.EFFECT: improvement of reliability of determination of fractional and substance composition of the guarding cushion.1 dwg
FIELD: mining.SUBSTANCE: claimed process comprises the determination of maximum distances of said degassing influence on rocks of the bed and soil. For this, appropriate instruments are used to define the level of coal worked and close seams and degassing level dependence in underworked and overworked coal rock massifs in the second working area. Note here that maximum distances of degassing influence of second working on close coal seams are defined by the distances, the lengths, cut off by revealed relations on the axis of geometrical location of magnitudes of the maximum gas release from close coal seams relative to the second working face line. Note also that indicators of the close seam natural degassing are determined by linear relations including those of second working degassing influence on worked and close coal seams, location of maximum gas release from close coal seams relative to second working face line and the coefficient allowing from quantitative decrease in degassing influence on close coal seams remote from the worked seam.EFFECT: valid magnitudes of the influence, maximum underworked and overworked coal depths at second working areas, hence, precise forecast of the wall gas content and determination of close coal seam degassing parameters at the sections with high rates of face advance.
FIELD: mining.SUBSTANCE: claimed process comprises the erection of gypsum-well observation station in underground working. Gypsum ply, 20-50 cm wide and 0.5-3 cm deep, is applied on working sides, roof and floor, over its cross-section contour. Removal warning devices are secured in gypsum ply by a definite grid. Simultaneously with application of gypsum ply, some 1-2 m therefrom, wells are bored over the working cross-section, in radial directions in depth required for determination of working influence area. Working deformation patter is used to define the direction of the main normal strains σ1 in rock massif. Drilled observation wells are used to define the position of fractures in the massif to get the mapping, that is, a natural display of the well in space. Removal warning devices in gypsum ply are used to define the working convergence. Well mapping results are used to define the direction of the main normal strains and the depth of rock damage are propagation. This allows the determination of working and rock massif deformation mechanism.EFFECT: higher accuracy.2 cl, 4 dwg
FIELD: mining.SUBSTANCE: device for roof bolting monitoring contains check points, each of them is connected by flexible link with the appropriate indicator, and estuarine tube. At that the indicators are secured on the flexible links by the clamps, and are located one in another or are independent from each other. Besides the device for roof bolting monitoring has: the check point is made as spring with unbend ends; the indicators on the external surface have horizontal three-colour marking, it is applied using the paint, or is made out of straps separate or combined on the plate or shell. The indicators have additional shell out of the polymer material; flexible links are made out of stainless steel rope or out of the polymer or composite materials. The estuarine tube is made out of the metal or polymer, or composite materials.EFFECT: simplified installation, increased informativeness and reliability of state monitoring of the roof bolting and displacements of the enclosing rocks of the horizontal and inclined underground mine tunnels.6 cl, 9 dwg
FIELD: mining.SUBSTANCE: invention relates to mining engineering and operations, mining, in particular to devices for studying of physico-mechanical properties of rocks, and can be used in geology, mining, oil and gas industry for calculation of limiting values of pressure of hydraulic fracturing of formation. Essence of the invention is as follows: the rock sample is subjected to external pressure and the speeds of distribution of longitudinal and transversal elastic waves in the sample are measured. A cyclic external pressure load on the sample with alternation of loading and unloading, with gradual growth of external pressure up to the nominal value the achievement of which is obvious at the moment of stabilisation of correlation of the speed of propagation of longitudinal and transversal waves and the increase of external pressure on the sample, as a consequence the resulted values of speed of propagation of longitudinal and transversal waves are considered as true values for calculation of elasticity modulus and Poisson's constant.EFFECT: minimising the error of measurement of speed of propagation of elastic waves in core samples.1 dwg
FIELD: instrumentation.SUBSTANCE: suggested group of inventions relates to measuring equipment, in particular to method of creation of well directional survey systems, and can be used in mining to check the deformation processes relating rocks and filling mass. The well directional probe is suggested, containing cylindrical casing with devices measuring inclination angle of the subhorizontal well, and located in the casing pipe for installation in the said well with possibility of movement along its longitudinal axis. At that devices measuring inclination angle of the subhorizontal well are implemented by the located perpendicular to each other measuring sensor of inclination angle relatively to the horizontal plane, installed in plane of the longitudinal axis of the casing, and sensor of position monitoring of the said measuring sensor in the vertical plane by the probe rotation by the forcing casing elements. The said sensors are connected with inputs of the matching block connected with output of the said probe. From outside the casing has at least two supports secured in the bottom part of the casing at its ends, and in top part at least two spring-loaded elements are provided for continuous contact of the supports in the bottom part of the casing with the internal surface of the casing pipe. Besides the system is suggested to determine the vertical subsidence of the rocks and fill mass, including connected in series said probe, electronic block, made based on the analogue-to-digital converter with power block, interface sub-system with applied software of data acquisition and storage. At that the electronic block is equipped with the ADC and power source by digital data exchange module in real time to the said interface sub-system, that is implemented as PC with common applied software of information processing and conversion, additionally containing block of pre-processing of said sensor signals, and block of rest modes selection, connected with inputs of block of current information displaying in graphical form and test control, which output is connected with input of the block of data presentation and files storage.EFFECT: increased accuracy of measurements of inclination angle of subhorizontal well relatively to the horizontal plane, and increased accuracy of determination of position of zones with local deformations (critical zones).4 cl, 2 dwg
FIELD: mining operations.SUBSTANCE: invention relates to mining operations and can be used to determine the stresses in the rock mass. The method in which the samples are recovered from the mass in the direction coinciding with the direction of the maximum main stress present in it. They are exposed to volumetric heating from 20 to 570°C, then they are left for cooling to a temperature of 140-150°C, the activity of acoustic emission is recorded simultaneously. The ratio of the amplitudes enveloping the acoustic emission activity is determined, occurring during cooling and heating, according to which the reaching by the stress at the test sites of the mass of the load level is determined, equal to or greater than 0.9 times the compressive strength of the rock, representing the transition of the latter to the stage of pre-destruction.EFFECT: determining the fact of exceeding by the value of the maximum main stress of the critical level equal to or greater than 0,9 times the compressive strength σcom that indicates the transition of the rock to the stage of pre-destruction.2 dwg
FIELD: instrumentation.SUBSTANCE: invention relates to mining and is intended to determine direction of maximum stress in structural elements of the development systems relatively to the drilled test wells. Method includes installation in the vertical well of the rod acoustic line, on which rigidly the contacting with well walls ring is installed, and registration of the acoustic emission (AE) at the acoustic line end projecting from the well. In mass in same horizontal plane with the test well and parallel to it additionally at least three wells are drilled, in each well the acoustic line with ring similar to the located in the first well are installed. All rings are made out of lamellar composite material with anisotropic structure in the ring plane, and orientation angle of the ring layers in each next well is increased by 15° relatively to the previous. As per AE signals registered at each acoustic line the corresponding relationships of total count vs. Time are determined, the acoustic line with total count of AE drop with time is determined. According to the direction of layers in the ring in this acoustic line the direction of maximum stress occurred in the mass in plane of the orthogonal axis of the measuring well is determined.EFFECT: assurance of the possibility of determination of the maximum stress acting orthogonally to the measuring well.2 dwg
FIELD: instrumentation.SUBSTANCE: invention relates to mining, mainly to coal industry. Method is suggested to determine gas content of the coal mass in zone of its destruction, including the shift-based working hours of the coal production cut face, course treatment by the longitudinal straps, measurement of intensity of gas evolution from the treated course per the production shift, and determination of the index of intensity rise of the gas evolution to the face space of the longwall face during the coal destruction. At that the intensity of gas evolution from the course is measured during removal of the first and second coal straps after the repair shift, at that the gas content of the coal mass in the zone of its destruction is determined as per the provided mathematical expression.EFFECT: suggested method ensures determination of the reliable value of the gas content of the coal mass in zone of its destruction due to the direct measurements of the intensity of gas evolution from the course in the face space.
FIELD: oil and gas industry.SUBSTANCE: invention relates to the method and device for production increasing at the field containing rock that includes at least one mineral of valuable material opened by tock grinding, and at least one other mineral, at that mineral of the valuable material has higher density the at least one other mineral. At that the method is characterised by the following stages: drilling using the drill rig for rock extraction. At that the drill fines are produced, aerosol is generated, it contains drill fines and gas flow, aerosol is transferred from the drill rig to at least one air separator; flow classification is performed, at that at least two fractions are created, they include particles of the appropriate equal-falling drill fines; and properties of at least one fraction are determined, this fraction is used as measure determining optimal degree of the rock grinding.EFFECT: increased field production.23 cl, 4 dwg
FIELD: mining.SUBSTANCE: invention relates to the method and the device for determination of local size of mineral grain for a valuable material mineral in rock of a field or deposit, and rock includes at least one another mineral, and the valuable material mineral is of higher density, than at least one another mineral. The method is characterised by the following stages: execution of the process of rock drilling using the drilling rig, with forming of cuttings, formation of aerosol which comprises cuttings and gas flow, transfer of aerosol from the drilling rig to at least one air separator, execution of sizing in a flow and at least two fractions comprising particles corresponding to equal-settling of cuttings, and determination of property of at least one of fractions which is used as a measure for the local size of mineral grain for valuable material mineral in rock.EFFECT: determination of local grain size of valuable material mineral in rock of a field or deposit.20 cl, 3 dwg
FIELD: test equipment.SUBSTANCE: invention relates to test equipment, namely to engineering surveys, and can be used to determine a strain-and-stress state of rocks, and namely to determine a stage of development of deformation processes in mass of material (in rock mass, soils under an engineering facility, etc.). Essence of the invention: specimens of material with a brittle skeletal frame are taken. Loading of specimens is performed and physical and mechanical characteristics of material are recorded, and a stress-deformation curve is built up, as per which parameters characterising a precursor of material destruction are determined. At compression of specimens, coefficients αp−, α-, αJ are determined, which characterise variation in potential energy of elastic deformation at scattered destruction of material, and the precursor of material destruction is found out by the formula: ω=α_I1+αJJ+αp−Δp−γ−, where γ- - a positive parameter setting a quadratic dependence of surface energy of an accumulated set of microcracks in brittle material, I1 - relative variation in material volume, J - intensity of tangential deformations, and Δp - variation in intra-threshold pressure.EFFECT: possibility of characterising a stage of material state prior to destruction, which is a precursor of material destruction, by reducing the time of measurement due to reduction of the number of test specimens.3 cl, 3 dwg
FIELD: mining.SUBSTANCE: invention proposes two versions of a method - for a bottom-hole zone and a section remote from the bottom-hole zone. In both versions, measurements of amplitudes of pulses of electromagnetic interference signals (EMI) are made. Before EMI signals are recorded, a gauging station is formed to make measurements of values of amplitudes of EMI signal pulses, for which there used is a lead ball with a fastener at the height of 1.5 m, which is fixed in its roof rock, from soil of the working, thus arranging them along the vertical axis of this plane; after that, the specified device is arranged in front of the above fastener. Values of amplitudes of EMI signal pulses are measured; maximum values are chosen - Nmax (Version 1) and N'max (Version 2), which are compared to critical value Ncr of amplitude of EMI pulses along well horizon. If Nmax>Ncr or N'max≤Ncr, then, distance of the considered section is assessed as dangerous. Scaling of low-browed roof breaks and lumps of rock is performed with a tool. Operations are performed until Nmax≤Ncr or N'max≤Ncr is obtained.EFFECT: improving accuracy of measurements by means of a single order of selection of measurement points, fixation of the number of counts and regular orientation of the chosen device.6 cl, 2 dwg
FIELD: mining.SUBSTANCE: measurement of relative variation of radiation temperature of the surface of the working face of the bed is made remotely at the distance of 1.0-1.5 m in 3-5 m throughout the long face length; with that, at each measurement point an average value obtained at least in 30 measurement cycles is considered, and a boundary of the protected zone is accepted as distance from a contact line of the bed to the worked-out space to a fixation point of stabilisation of a radiation temperature value. As per the method for determining boundaries of protected zones in long faces of coal beds, remote measurement of relative variation of radiation temperature (infrared radiation intensity) of the surface of the working face of the bed is performed. The first measurement is made at a point at the distance of 3-5 m from a stable hole or a strike entry; the following measurement points are located at equal distance in 3-5 m throughout the long face length. At least 5 point measurements are made at each measurement point. After completion of each measurement cycle for each point in a cycle there calculated are average values. As per average values of at least 30 measurement cycles there built is a chart of relative variation of radiation temperature of the bed working face surface throughout the long face length, and a point of its stabilisation is fixed, which represents a boundary of the protected zone.EFFECT: increasing safe execution of mining operations.1 dwg
FIELD: mining.SUBSTANCE: method of forecast of location of lower boundary of explosive gas zone in working face is proposed, comprising the driving of bypass in working area, implementation of well into the top of layer, and measurement of methane concentration along its length by the moving gas metering probe. At that the well into the top of layer is carried out from the junction of lava with adjoining air release working in the direction of the worked-out area of the current working area to placement of immediate mine roof to the length equal to its pitch of placement, at an angle of unloading of roof rocks from moving boundary of the stope. The measurement of methane concentration is made along the length of the well with the forward and reverse movement of gas measuring probe in preassigned intervals of length of the well, and the lower boundary of explosive gas zone is set from the top of layer along the lower concentration limit of explosibility of gas-air mixture.EFFECT: implementation of the method enables to establish, in each specific case of mining coal bed, the location of the lower boundary of explosive gas zone in the working face in the most dangerous part of it, to make recommendations to eliminate accumulations of explosive gases, and to improve the safety of stoping on the gas factor.
FIELD: mining.SUBSTANCE: method of determining the length of bearing pressure zone from breakage face is proposed, comprising preparatory workings, mining of coalbed with breakage face, drilling the degasification well, sealing its mouth from the mine atmosphere, measuring the intensity of gas release from the well when it transition from the zone of natural permeability of the bed in the bearing pressure zone from the breakage face. At that, the well in the unrelieved mass of the bed is drilled to the border of the bearing pressure from the opposite working, and the well mouth is sealed to the depth of the bearing pressure zone from the working, from which it is drilled. And the length of the bearing pressure zone from the breakage face is determined according to the distance between the zones of start of loading the bed and start of its discharge from the rock pressure.EFFECT: improvement of accuracy of determining the length of the bearing pressure zone from the breakage face.
FIELD: mining.SUBSTANCE: in a model of fractured rock massif, which includes a slot between non-deformed blocks with fixing material, according to the invention, slot-forming block surfaces have a cellular shape. Dimensions of cells correspond to geometry of fixing particles and to the value of their indentation into the deformed mine rock massif.EFFECT: improving simulation accuracy of a fixing process of hydraulic fractures and interaction of the fixing material with fracture walls in deformed rocks owing to considering indentation of particles of the fixing material into fracture walls of the investigated massif.2 dwg
FIELD: mining.SUBSTANCE: method involves measurement of stresses in mine rock body beyond the limits of an influence zone of second (mining) working at different depth when using underground mine workings, build-up of charts (dependences) of variation of the obtained primary stresses with depth. In order to improve forecast accuracy of stresses, including at horizon depth, each of the primary stresses is divided into constant and variable (pulsating) components in time. Relationship between variation of constant component parts with depth is obtained; a law of variation of variable (pulsating) stresses in time is found; then, these component parts are added at the required depth and the required time.EFFECT: improving forecast accuracy of stresses on lower horizons in the future and at use of measurement results in the past on upper horizons.2 dwg, 1 tbl
FIELD: physics.SUBSTANCE: apparatus for monitoring change in the stress condition of a rock mass further includes a control unit, a switching unit and a time selection unit, wherein the input of the control unit is connected to the clock output of a generator, and the outputs to the control unit and the control inputs of the time selection units, wherein each input of the next time selection unit is connected to the output of the previous and corresponding input of the switching unit, and the input of the first time selection unit is connected to receiving transducers, while the output of the switching unit is connected to the output of a spectrum analyser.EFFECT: high reliability of monitoring change in the physical-mechanical state of a rock mass owing to a higher signal-to-noise ratio of the information-measurement system.3 dwg
FIELD: mining.SUBSTANCE: method involves action on a mine rock and its destruction with a rotating indenter under load, determination of hardness parameters using the value of applied load and area of contact surface of the indenter. Measurements are made immediately during drilling in a differential form: mechanical drilling speed or time of duration of a certain depth interval, a value of speeds or time is adjusted by variation of load on a bit; the bit load value is measured at moment of equality of speeds or times and hardness of mine rock is determined as per an algorithm.EFFECT: optimisation of a well drilling process.4 cl, 1 dwg
FIELD: mining.SUBSTANCE: sensor and a portion of mortar for its plugging are delivered to a well at one and the same time in a special capsule; besides, the portion of the plugging mortar is packed into a breakable bag that is arranged in the capsule in front of the sensor in the direction of its movement into the well. After angular orientation of the sensor near the bottom of the well and its plugging by displacement of the mortar from the plastic bag under action of the force applied to the sensor; the delivery capsule is removed out of the well. The device for implementation of the proposed method consists of a capsule having a shape of a cylinder with a diameter comparable to the well diameter. Movement of the delivery capsule into the well is performed by means of a delivery stiff rod rigidly fixed with one of its ends to the rear part of the capsule and an extensible one on the other end by means of a detachable stiff connection as the capsule is being delivered deep into the well.EFFECT: improving efficient delivery of sensors into wells.2 cl, 2 dwg
FIELD: measurement equipment.SUBSTANCE: invention refers to mining and is meant for evaluation of stress strain behaviour of rock mass section by recording pulse emission of electromagnetic oscillations. Method involves measurement of maximum amplitudes in roadway and maximum activity of electromagnetic emission on record threshold above the level of electromagnetic emission background. In the range of amplitudes from zero reading to maximum reading, calculated is A parameter as logarithmic mean value of distribution of pulses peak amplitudes. All the values of amplitudes of the specified range are divided into 10 unequal threshold in logarithmic progression in increment divisible by log2. Bar chart of signals distribution is built in double logarithmical coordinates. Based on this bar chart calculated is B parameter as estimation of rise rate of pulses peak amplitudes above the threshold level. Dependence diagrams of parameter values A(xi) and B(xi) from station xi location on roadway profile are built as well as diagrams of gradients of these parameters functions. Critical values of Acr and Bcr are determined as well as their total critical rate of change. Rock-bump hazardous considered are those sections where at least four of three inequations are realised simultaneously. Device contains series-connected electromagnetic sensor, preamplifier and amplifier, analogue-to-digital converter and digital processing unit with indicating unit connected to it. According to the method the device is additionally provided with low-frequency filter connected to series circuit between preamplifier and amplifier, series connected between amplifier and analogue-to-digital converter, the second low-frequency filter and high-frequency filter, as well as reference voltage source, and to digital processing unit connected is quick operating digital signal processor double connected to analogue-to-digital converter, double connected also to programs non-volatile memory, data flash-memory and USB-port.EFFECT: improving accuracy and reliability of rocks dynamic fracture forecast, as well as reducing labour intensity and improving measurements processibility.8 cl, 5 dwg
FIELD: mining.SUBSTANCE: device has a head with a cutter fixed on a holder, and a driving screw with a nut. The head with cutter are designed with a possibility of their movement along guides fixed on the frame, meanwhile the head is implemented with cylindrical recess. In the head recess from one end a coil compression spring fitted with a sensor, recording the spring compression force is located. The second end of the spring is placed in recess of a thrust washer with a possibility of a thrusting the screw end. The screw is installed in a support fixed on guides, with a possibility of its interaction with the relevant thread of the support bearing at the screw rotating by the automated drive.EFFECT: ensuring of continuous cutter motion and maintaining of quasi-constant tension in front of the cutter in the top of mainline fracture.2 dwg
FIELD: mining.SUBSTANCE: invention relates to mining and is designed to determine the change in the stress state of the rock mass. The method comprises placement in the well of the hollow cylindrical acoustic line, receiving and analysis of parameters of ultrasonic signals propagating in it by means of the acoustic emission transducers mounted on its end surfaces. Preliminarily on the acoustic line coaxially with it and at some distance from each other at least two rings of textolite are fixed, which inner diameter coincides with the diameter of the acoustic line, and the outer - with the well diameter. Deformation of the well due to the shift of the reference pressure zone, results in deformation of the respective textolite rings and, respectively, the growth of acoustic-emission activity in these discs. The difference in time of arrival to the receiving transducers of those acoustic emission signals is measured, the amplitude of which is maximum of all incoming signals, and the depth of the zone of the reference pressure and its change in time is judged by the above mentioned time difference, the known length of the acoustic line and the measured rate of propagation of ultrasound in it.EFFECT: increase in duration of the definition of changes in the stress state of rock mass in the vicinity of working during continuous monitoring acoustic-emission measurements of movement deeper into the solid mass of the zone of reference pressure.4 dwg
FIELD: physics.SUBSTANCE: method comprises, at the initial phase, shifting the position of the press plate by a given value in steps through given equal time intervals; at each step, detecting acoustic emission flux, selecting separate acoustic events, determining the flux density of the acoustic emission; when flux acoustic emission intensity reaches a given value, reducing at each subsequent step the shift value of the position of the press plate, while maintaining the acoustic emission intensity at the given level; when the value of the stepwise shift of the position of the press plate reaches a minimum allowable value and when acoustic emission intensity exceeds a given value during each subsequent stepwise shift, increasing the time interval for shifting the position of the press plate; when acoustic emission intensity subsequently falls below the given value, reducing the time interval for shifting the position of the press plate to the value given at the initial phase.EFFECT: more acoustic events during breakdown of rock grains detected when testing a sample.3 cl, 4 dwg
FIELD: mining.SUBSTANCE: device comprises a motor, an electric power meter, a rock destroying tool and a cup for placement the rock sample, the lower part of which is made in the form of a piston. Movement of the piston in a cup is carried out by the pusher interacting with the load placed in the cup by four power and four transmission belts, two rackbars placed on the pusher and which are in involute gearing with two gear wheels, four drums and four pulleys. The drums are placed on the same shaft with each gear wheel, one on each side, and each of four power belts is fastened with one end to the drum and with the other on the support of gear wheel.EFFECT: simplifying the design of the device without deterioration in its performance, with the ability of implementation of the device based on the lathe with a minor alteration.1 dwg
FIELD: mining.SUBSTANCE: method of determining outburst sites in coal pits, comprising interval drilling well in the bottomhole of development opening, measuring at each interval of exit of drill cuttings and the initial rate of gas emission and determining the possibility of existence in the coal bed of solid solutions of natural gas according to the type of gas hydrates. Then in the drilled well the specific electrical resistivity of the coal bed is measured and the dependency diagram of the specific electrical resistivity of the coal bed from the distance along the well axis is made, using which the width of the site of the coal bed is determined, comprising the solid solution of natural gas according to the type of gas hydrates. Then the rate of outburst Rn is determined taking into account the width of the site of coal bed comprising the solid solution of natural gas according to the type of gas hydrates, and the natural moisture content of the coal bed. At that on the test site of the coal bed at a distance of 0.75÷1.25 m from the first well the second well is drilled. Then the velocity of elastic waves in the array between the wells is determined, for which the piezoelectric detectors are placed in both wells, which are moved with the increment of 0.15÷0.25 m simultaneously in both wells. At that the sites of the coal bed, in which the specific electrical resistivity is 50÷100 times greater than the specific electrical resistivity of the adjacent sites, contain the solid solution of natural gas according to the type of gas hydrates, if the velocity of elastic waves in them is about 2.0÷2.5 km/s.EFFECT: increasing the reliability of determining the outburst in sites of coal beds.4 dwg