Installation for borehole hydraulic excavating of minerals
SUBSTANCE: invention refers to mining and can be implemented at open development of mineral deposits by method of borehole hydraulic excavation. The installation consists of a high pressure column with channels for power water supply and for pulp lifting, of monitor nozzle, of a hydraulic lift, of a receiving chamber with openings and of a hollow head with a nozzle of the hydraulic lift. The installation is equipped with movable and fixed knives, with a spring loaded piston installed in the cavity of the head and designed to travel, and with guides located on sides of the openings; also the movable knives are installed in the guides, while the fixed knives are arranged in the openings. The movable knives are connected to the piston by means of rods. The invention facilitates reducing idle time and carrying out excavating process practically continuously to chamber completion.
EFFECT: reducing idle time and carrying out excavating process practically continuously to chamber completion.
4 cl, 3 dwg
The invention relates to mining and can be used in the development of mineral deposits by hydraulic borehole mining method.
The closest in technical essence to the invention is a device for hydraulic borehole mining of minerals, including high-pressure becoming with channels for supplying the energy of the water and lifting the pulp, monitor nozzle, hydraulic ejector and receiving chamber with Windows is limited by springs, and a hollow tip with a hydraulic ejector nozzle .
The disadvantage of this device is the possibility of jamming oversized pieces between the springs, causing the unit to fail.
The problem to which the present invention is directed - improving the reliability of the device.
The technical result is an exception to the accumulation of oversized pieces in the zone of suction.
The technical result is achieved in that the device for hydraulic borehole mining of minerals, including high-pressure becoming with channels for supplying the energy of the water and lifting the pulp, monitor nozzle, hydraulic ejector, the receiving chamber with Windows and hollow tip with a nozzle jet Elevator, equipped with movable and stationary knives, spring-loaded piston mounted in the cavity of the tip can be moved, and, on th the mi side Windows, guides that have moving blades and stationary blades installed in the Windows, while moving the knife through a rod connected with the piston.
The movable and stationary knives set with mutually opposite angles.
In addition, the piston is made in the form of an inverted Cup.
To improve the reliability of the piston is provided with a sealer.
This set includes all the essential features, each of which is indispensable, and all sufficient to achieve a technical result.
The invention is illustrated by drawings:
1 shows a General view of the device; figure 2 is a side view, figure 3 - a view A-a in figure 1.
Device for hydraulic borehole mining of minerals includes high-pressure becoming 1, channel 2 for supplying energy and water channel 3 rise of the pulp, monitor nozzle 4, the hydraulic ejector 5, the receiving chamber 6 with Windows 7 and the hollow tip 8 with hydraulic ejector nozzle 9. In the cavity 10 of the tip 8 has a piston 11. In Windows 7 there is fixed knives 13. On the sides of Windows 7 are the guides 12, which is installed with the possibility of moving the movable blades 14. The latter are connected with the piston 11 by means of rods 15. The piston is spring-loaded by a spring 16.
The device operates as follows.
In drilled and cased wells is inu placed hydroporinae device, receiving chamber 6 which is placed in peribere. When applying the energy of water in channel 2, it goes to the monitor nozzle 4, leaving which produces the destruction of the array. At the same time energy water enters the cavity 10 of the tip 8 and presses the piston 11. The last moves, opening the nozzle of the hydraulic ejector 9. In addition, moving the piston 11 moves the associated rods 15, and those, in turn, move to the lowest position of the movable knives 14. Formed in the process of washing the pulp with oversized pieces of minerals and macro-grained rock rock flows by gravity into the zone of suction to the inlet chamber 6 and through the Windows 7 enters the mixing zone. Under the action of coming out of the jet from the nozzle of the hydraulic ejector 9 vacuum is created, and the slurry through the channel 3 is given to the surface. Oversized pieces 19 are accumulated in the suction zone and partially trapped between the blades 13 and 14, resulting in changing the consistency of the pulp directly into the receiving chamber 6, which is fixed by the consistometer. When you change the consistency of the pulp to a certain point stop the flow energy of the water channel 2. Under the action of the spring 16, the piston 11 moves upward, pushing the rods 15 movable knives 14. The result is trapped between the fixed 13 and 14 movable knives megabar the local pieces of the partially crushed. Due to the opposite inclination of the movable 14 and 13 fixed knives part oversized pieces slide on their cutting edges and is discarded to the side. After several cycles of on-off supply of energy water, achieve purification zone suction and Windows 7, as well as the partial destruction of oversized.
Execution of the piston in the form of an inverted Cup improves sealing podpornoy cavity and reliable fixation of the spring.
To improve the sealing serve hermitstory made, for example, in the form of rubber rings.
The proposed device will reduce downtime and to carry out the process of production almost continuously until full testing of the camera.
Sources of information
1. SU 1065601, CL IS 45/00, 07.01.1984, bull.№1.
1. Device for hydraulic borehole mining of minerals, including high-pressure becoming with channels for supplying the energy of the water and lifting the pulp, monitor nozzle, hydraulic ejector, the receiving chamber with Windows and hollow tip with a hydraulic ejector nozzle, characterized in that it is provided with a movable and stationary knives, spring-loaded piston mounted in the cavity of the tip can be moved and located at the sides of the window guide rails which are mounted the movable knife and fixed n the LM is set in the Windows, when this movable knives through a rod connected with the piston.
2. The device according to claim 1, characterized in that the movable and stationary knives set with mutually opposite angles.
3. The device according to claim 1, characterized in that the piston is made in the form of an inverted Cup.
4. The device according to claim 1 or 3, characterized in that the piston is provided with a sealer.
SUBSTANCE: invention refers to procedures of mineral development of placers and sedimentary deposits with stable roof. The procedure consists in exposing the site of a producing reservoir with a main borehole embedding it into rock subjacent the said reservoir, in equipping the main borehole with a casing pipe, in assembling the bearing plate of the latter within boundaries of embedded part of the borehole, in forming in subjacent rock a receiving chamber with inclined outlet openings led to a floor of a producer, in leaving above them a preventive rock massif, in installation of a main hydro-monitor and a pulp-lifting device in the receiving chamber, in fluid wash of main reserve of mineral, in successive fluid wash of mineral placed above massif, and in lifting pulp via the main borehole from the receiving chamber to surface. Development is carried out chamber by chamber, for the purpose of which there are bored auxiliary boreholes around the main one with diametre less, than that of the main, wherein auxiliary hydro-monitors are installed; flush of reserves of a corresponding chamber is performed from each borehole; before flush of chamber reserves above massif there is carried out lifting of the main hydro-monitor and cased column; further the bearing plate of the latter is assembled and the main hydro-monitor is installed above massif within boundaries of thickness of the producer.
EFFECT: increased yield rate from one borehole, more rational development of deposits due to decreased loss of mineral and reduced extraction of barren rock to surface.
SUBSTANCE: invention refers to mining and can be implemented at borehole hydraulic excavating of minerals. The installation consists of a high pressure column, and of a central pulp lifting column installed inside the high pressure column, interior cavity of which is connected to internal cavity of the high pressure column via a nozzle of hydraulic lift; in a lower part of the high pressure column there is installed the nozzle of the hydraulic lift; an additional nozzle with a suction chamber is rigidly connected to the nozzle of the hydraulic lift. The nozzle of the hydraulic lift is connected to the high pressure column, is designed to rotate relative to its lengthwise axis and is equipped with a tailed jet; also tails of the jet are bent opposite to rotation direction; while the suction chamber is equipped with a pulp intake with openings assembled radial to the suction chamber and directed to the side of hydraulic monitor rotation. The invention facilitates increased efficiency due to intensification of pulp formation process and due to increased per cent contents of extracted material in pulp.
EFFECT: increased efficiency due to intensification of pulp formation process and due to increased per cent contents of extracted material in pulp.
SUBSTANCE: invention refers to open development of mineral placers, particularly to mining and concentration of gold containing placers in winter. The procedure consists in exposing works, in sand excavating and in sand transporting to a basin, in flushing and in dump piling. Also, in winter primary excavation and sand transporting are performed with preliminary piling sand on ice of the basin, while the secondary excavation and flushing are carried out in a warm season.
EFFECT: increased degree of disintegration of hard flushed clayish sand and reduced losses of valuable component.
2 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to development of mineral deposits, particularly clay placers, and can be implemented in mining industry. The method consists in striking developed placers, in their layer-specific excavation with parallel trenches leaving between-trenches massifs, in concentrating and in piling. Also between the first trench and the circuit of developed deposit an additional ditch is made, wherein water is supplied; when a successive trench is entered, each preceding trench is successively filled with water. When the last trench is driven, deposit is flooded; between trenches massifs are debugged by means of a drag or dredger; notably, debugging is performed from the first trench to the last one.
EFFECT: increased efficiency of clay placers development by means of increased degree of disintegration and extraction of valuable component at reduced technological losses.
2 cl, 2 dwg
SUBSTANCE: invention refers to development of deposits, particularly, gravel deposits, and can be implemented in mining industry. The method consists in stripping sand, in excavating and transporting sand to a hopper of a washing installation, in concentrating and in piling. Prior to transporting sand into the hopper of the washing installation, sand is piled in a trench laid in the center of the gravel deposit along the length of a production block at the depth below the level of the soil of the sand bed; the trench is filled with water. Also sands are piled in the trench below the water level, and their successive excavation is performed by the underwater method.
EFFECT: increased degree of disintegration of hard washed clayish sand and reduced process losses of valuable component with reduced cost for sand transporting.
SUBSTANCE: method of development of buried water-flooded placers includes preliminary concentration of useful component of sands in lower portion of placer by means of excitation of elastic oscillations in placer sands and successive stoped excavation. A tubular shell is inserted into the placer; the height of the shell exceeds the distance from the surface to the float of the spacer. Excitation of elastic oscillations in spacer sands is performed by means of their transmitting from the surface via the tubular shell. After compressive force has been formed from interior surface of the shell onto contacting surface of covering volume of barren material and after completion of vibratory processing the hydraulic stoped excavation of lower part of the placer is carried out; washing water is supplied via sprayers assembled at walls of the tubular shell and pulp is withdrawn via soil intake openings located at walls of the tubular shell between the sprayers. Also after completion of stoped excavation of lower part of the placer the stoped space is backfilled by supplied backfilling pulp and water withdrawal. Further backfilling pulp is formed from mixture of water with barren rock, for instance, with tailings of sand concentration. After backfilling of excavated space pressure onto surface of covering volume of waste material contacting with interior surface of the shell is dropped to zero and the shell is extracted.
EFFECT: increased selectivity of excavation.
SUBSTANCE: present invention pertains to excavation of mineral deposits, and particularly to gravel deposits, and can be used in the mining industry. The method involves pre-formation of a basin, formation of a dry zone on the productive stratum and basin in the stripped area, fitting interconnected, mining, transport and dump systems into the basin. Formation of the basin in the stripped area is done after piling up sand in it, with further extraction of the latter using a subsurface technique. The minimum distance from the basin to the heap of sand, as well as the depth of the basin, is determined from the maximum degree of weakening of the latter and technological parameters of the mining equipment.
EFFECT: increased efficiency of excavating high-clayey alluvial deposits.
SUBSTANCE: present invention pertains to mining and can be used in excavating deep-seated deposits of minerals, formed by layers with different strength. The method of excavating deep-seated deposits of minerals involves excavating a mining horizon, hydraulic mining of wells on the mining horizon, when mining waterlogged minerals, lying under the mining horizon. From the heading to the deposit of the mineral, dewatering wells are drilled and the head of ground water, in the productive stratum of the deposit, is lowered to a level lower than the sill of the mining horizon. To lower the head of ground water over the deposit to a level safe for mining, in the water bearing bed from the mining horizon, rising, inclined-rising, horizontal guide holes are made, and from the surface to the heading, wells with cased hole filters are made. All these wells are hydraulically linked to each other and to a pump system, from which water is supplied to a domestic water head works, undergoing preliminary purification. The invention can also be used for washing out mineral deposits when hydromining and for water collection in underground water catch basins.
EFFECT: safer mining when flooding minerals and layers above them, as well as increased efficiency of mining and improvement of environmental conservation.
2 cl, 1 dwg
SUBSTANCE: group of inventions relates to mechanical engineering and can be used directly in development of subsea mineral deposits, where mineral components are pumped out by airlift. Method for starting and stopping of offshore airlift, where starting process includes compressed air supply via pressure pipeline from compressor to mixer of lifting pipe, while stopping process includes stopping of compressed air supply via pressure pipeline from compressor to mixer of lifting pipe, compressed air supply from compressor to upper part of said offshore airlift's lifting pipe and its discharging to atmosphere, as well as compressor stopping. In the course of offshore airlift starting process amount of sea water supply to lifting pipe of offshore airlift is pre-defined, connection between upper part of lifting pipe and atmosphere is closed, compressed air is supplied into upper part of lifting pipe of offshore airlift, sea water is displaced from lifting pipe to ocean through connecting pipe, compressed air supply into upper part of lifting pipe is stopped after the required air pressure in said pipe is achieved, connection of lifting pipe with ocean through connecting pipe is closed, connection between upper part of lifting pipe with atmosphere is restored with simultaneous supply of compressed air into mixer of lifting pipe. After that, connection between lifting pipe and ocean is provided through connecting pipe, amount of sea water supplied into lifting pipe is monitored, measured pressure value is compared with pre-defined target value and balanced with it through adjustment of sea water flowrate in said connecting pipe. And when water-air mix is spread over the entire length of lifting pipe, unrestricted supply of sea water through connecting pipe to lifting pipe is restored. And in the course of offshore airlift stopping process, pressure value in upper part of lifting pipe is pre-defined, then this value is monitored during compressed air supply from compressor to upper part of offshore airlift's lifting pipe, measured pressure value is compared with pre-defined value and as soon as they become equal said compressor is stopped. After that, connection between lifting pipe and ocean through connecting pipe is closed and connection of upper part of lifting pipe with atmosphere is opened again.
EFFECT: improvement of offshore airlift starting and stopping method.
2 cl, 3 dwg
SUBSTANCE: group of inventions relates to mechanical engineering and can be used directly in development of subsea mineral deposits, where mineral components are pumped out by airlift. Method for starting and operating of offshore airlift includes pumping out of components from subsea mineral deposits as a part of hydromixture, supply of compressed air into mixer of lifting pipe, creation of multicomponent mixture after the compressed air is injected into hydromixture flow, and transporting of multicomponent mixture flow in lifting pipe of offshore airlift. In this method pressure value of air-water mixture is pre-defined in operating mixer of lifting pipe, where compressed air is supplied from compressor during airlift operation at its operating performance rate. Then compressed air is supplied from compressor into lifting pipe mixer, which is located above operating mixer, the air localised in accumulator is additionally compressed up to the pressure in operating mixer by supplying sea water into said accumulator under its static pressure. Then this additionally compressed air is supplied into operating mixer, pressure of sea water in operating mixer is monitored during the process of compressed air supply into it, measured pressure value is compared with pre-defined target value and as soon as they become equal supply of compressed air into said mixer is stopped, as well as supply of sea water into accumulator, while compressed air from compressor is supplied simultaneously into operating mixer through accumulator. After that, during offshore airlift operation, accumulator is charged with compressed air from compressor by means of parallel supply of sea water from said accumulator into operating mixer, when a difference is established between supply of compressed air from compressor to accumulator and supply of compressed air from accumulator to operating mixer.
EFFECT: improvement of method for starting and operating of offshore airlift, as well as system for its implementation.
3 cl, 4 dwg
FIELD: mining industry.
SUBSTANCE: method includes opening productive bed by product slanting well, casing the well by pipes column, mounting well block with concentrically positioned pipes columns, lift and hydro-monitoring headpiece, hydro-monitoring erosion of bed and raising formed mixture of rocks by said lift to surface. According to method, opening of productive bed is performed using product slanting well and its casing is performed by displacing outer pipes column of well block along well axis and concurrent rotation of inner pipes column, hydro-monitoring headpiece is inserted inside outer column of pipes of well block, and during erosion of bed it is pulled out of outer pipes column of well block. Device for realization of said method is made in form of well block, including as common parts concentrically placed pipes column, outermost of which is casing column of well, and inner one is provided with headpiece with lift, hydro-monitoring headpiece and pressurizing element, and portal in form of two-passage swivel for feeding water and draining pulp. Pressurizing element is mounted at end piece above hydro-monitoring headpiece and is made in form of cylindrical shelf. To limit movement of inner pipes column relatively to outer pipes column, at lower end of outer pipes column a bushing is mounted with possible interaction with cylindrical shelf, outer diameter of which exceeds inner diameter of bushing.
EFFECT: higher efficiency, lower costs, lower laboriousness.
2 cl, 4 dwg
FIELD: mineral extraction method with the use of underground hydraulic ore cutting and extraction of crushed ore through boreholes.
SUBSTANCE: method involves cutting deposit over the deposit area into panels (sections or blocks); drilling boreholes for extracting pulp; arranging standpipe for pressure working medium supply and standpipe for conveyance medium supply; forming working excavation and filling thereof with stowing after development; performing lower deposit undercutting to provide ore massif permeability for working medium by serial shock blasting borehole and then camouflet explosive charges; forming camouflet cavities by blasting borehole charges and intermediate camouflets; performing successive impregnating of crushed massif with medium dissolving borehole minerals (for instance with acid or alkali solution); arranging containers with the dissolving medium above camouflet explosive charges before blasting thereof; separating them from explosive charges and from upper borehole part by stowing; supplying working medium through pressure working medium pipeline without creating overpressure in the medium; increasing pressure at outlet with hydraulic intensifier; regulating ratio between solid and liquid components of pulp risen by means of airlift plant by supplying compressed air through actuator arranged under pulp intake means.
EFFECT: increased fullness of mineral extraction.
3 cl, 6 dwg
FIELD: transport building, particularly to perform mining operations in far north areas.
SUBSTANCE: method involves cutting ground in pit and supplying sludge to concentration plant; separating the sludge into concentrated and lean sludge fractions in the concentrated plant; forming deposit vessel in water pool, filling the vessel with lean fraction, wherein the vessel is isolated from concentrated ground deposit by partition dam; developing concentrated ground with jet drag heads; forming and supplying strong pulp to washing in zone; washing in ground in layers, wherein upper layer consists of concentrated draining ground, or forming above ground structure by freezing the ground in layers in winter period. To implement above method water pool bottom is deepened to design level, one or several head parts of drag head are installed on deepened water pool bottom, the head parts are covered with concentrated ground and ground deposit is formed below ice boundary of water pool. Ground is extracted from above deposit from under ice through flexible sludge pipelines during extended working season.
EFFECT: reduced unit costs for strong sludge forming and elimination of costs necessary to maintain lane above underwater ground deposit during extended working season.
2 cl, 2 dwg
FIELD: mining industry, particularly borehole mining.
SUBSTANCE: installation comprises platform, hydraulic monitor plant with telescopic head, as well as airlift, rotary device installed on the platform, water recycling system, elastic oscillation generation system and distribution device connected to falling airlift members and to ultrasound disintegrator. Hydraulic monitor plant is provided with automatic hydraulic monitor operation control system installed on additional platform and connected with executive members of rotary device made in hydraulic monitor plant through hydraulic system. Elastic oscillation generation system may produce ultrasound oscillations of changeable power, which are transmitted by means of wash zone oscillators, pre-disintegration zone oscillator and oscillators of ultrasound disintegrator of the fist and the second level. Wash zone oscillators and sensors which record dynamic wash zone properties are installed on upper telescopic bar of T-shaped lever pivotally secured to additional rod of hydraulic monitor plant and brought into cooperation with drive through L-shaped link for lever rotation. Pre-disintegration zone oscillator and sensors which record dynamic properties of pre-disintegration zone are installed on telescopic rotary device hinged with airlift rod. Sensors which record dynamic wash zone properties and ones which record dynamic properties of pre-disintegration zone are linked with control system, which controls ultrasound denerator operational characteristics, and with automatic hydraulic monitor operation control system by digital programmed transforming device. Sensors, which determine dynamic properties of ultrasound disintegrator, are installed at the first level surface inlet and outlet of the ultrasound disintegrator. Above sensors are connected with control system, which controls operational characteristics of ultrasound denerator, through digital programmed device related with the next disintegration operation.
EFFECT: increased efficiency of mining operation and increased environmental safety.
FIELD: mining industry, particularly borehole mining.
SUBSTANCE: installation comprises platform, hydraulic monitor plant with telescopic head, as well as airlift, rotary device installed on the platform, water recycling system, elastic oscillation generation system and distribution device connected to falling airlift members and to ultrasound disintegrator. Hydraulic monitor plant is provided with automatic hydraulic monitor operation control system installed on additional platform and connected with rotary device of hydraulic monitor plant through hydraulic system, wherein vertical rod of hydraulic monitor plant is provided with rigid fixers brought into cooperation with slots of additional vertical rod. Elastic oscillation generation system may produce ultrasound oscillations of changeable power, which are transmitted through transformers to wash zone oscillators, pre-disintegration zone oscillator and oscillators of ultrasound disintegrator of the fist and the second level. Sensors which record dynamic wash zone properties and sensors which record dynamic properties of pre-disintegration zone are installed on the additional rod included in hydraulic monitor. Sensors which record dynamic wash zone properties and ones which record dynamic properties of pre-disintegration zone are linked with control system, which controls ultrasound denerator operational characteristics, and with automatic hydraulic monitor operation control system by digital programmed prior transforming device. Sensors, which determine dynamic properties of ultrasound disintegrator, are installed at the first level surface inlet and outlet of the ultrasound disintegrator. Above sensors are connected with control system, which controls operational characteristics of ultrasound denerator, through digital programmed device related with the next disintegration operation.
EFFECT: increased efficiency of mining operation and increased environmental safety.
FIELD: mining industry, particularly to produce loose, soft or single-grained minerals through production boreholes.
SUBSTANCE: method involves installing drilling rig in one point of area to be treated; drilling inclined production boreholes at an angle to horizon; installing pipes in the borehole; assembling hydraulic production equipment and lifting mineral to surface. Drilling rig is installed in one point to be treated so that the drilling rig may perform azimuth and angular rotation in vertical plane. Several production boreholes extending at different angles to horizon in common vertical plane are drilled by the drilling rig. The first borehole has minimal angle defined by maximal possible length of borehole, which can be drilled by the drilling rig. The next borehole has maximal angle defined by rock deformation area to prevent rock deformation on surface and in mineral production equipment installation area. Remainder boreholes are drilled in the same vertical plane at α3, α4, ... απ angles to horizon, which maximizes efficiency of mineral production. Similar inclined boreholes are drilled in other vertical planes by rotating the drilling rig in azimuth direction through γ1, γ2 ... γπ angles. Mineral is produced simultaneously or sequentially from borehole groups to provide smooth lowering of overlaying rock.
EFFECT: increased mineral removing fullness with the use of single equipment unit, reduced amount of construction-and-assembling operations, possibility to perform operations in any season, reduced costs of operation performing in cold season, increased safety for staff and equipment.
2 dwg, 2 ex
FIELD: mineral field development by hydraulic mining methods, as well as borehole drilling and all-purpose underground cavities creation.
SUBSTANCE: device comprises connection pipe for pressure water. Connection pipe of slurry pipeline has conical constricted section, wear-resistant insert made as spaced rings of wear-resistant material installed downstream from the conical constricted section in slurry flow direction, and conical widening section arranged downstream from the rings. Connection pipe of slurry pipeline has orifices made in area of ring location and adapted to supply pressure water into connection pipe of slurry pipeline via gaps defined between the rings. Hydraulic elevator is arranged at end of connection pipe for pressure water. Connection pipe for pressure water and hydraulic elevator may have water-jet nozzles. Gaps between rings of wear-resistant insert are created due to ring end roughness. As pressure water is supplied part of flow moving via annular gap passes through annular hydraulic elevator and enters into connection pipe of slurry pipeline to create ascending flow. Due to created vacuum washed mineral is sucked into connection pipe of slurry pipeline in slurry form and then transported to surface.
EFFECT: reduced wear of inlet connection pipe part.
3 cl, 1 dwg
FIELD: methods of hydraulic mining, particularly hydraulic monitors for rock breakage with water jets.
SUBSTANCE: hydraulic monitor comprises base, hinge assembly and barrel with nozzle. Through pipe extending along barrel axis is installed in barrel channel and supported by centrators. The first pipe end is communicated with atmosphere, another one is located in the nozzle. Pipe-nozzle diameter ratio is 0.50-0.57. The pipe serves as ejection means. As high pressure water passes through the nozzle streamlined air bubble is created at pipe outlet due to air ejection. Air bubble pressure is less than atmospheric pressure. This provides jet compression at nozzle outlet and as a result increases jet range. Abrasive and chemical materials may be used with water jet to improve rock breakage efficiency.
EFFECT: increased efficiency.
FIELD: mining, particularly to develop gold-bearing rock with high clay content.
SUBSTANCE: method involves loosening rock by applying mechanical action to the rock along with periodically initiating elastic vibrations in ultrasonic-frequency band with constant frequency in clay-sand rock - water system, wherein the elastic vibrations are initiated under constant outer pressure and power for different time periods; determining optimal action application time to provide stable clay particle precipitation in clay-sand rock - water system having constant volume during previously choosing controllable particle dimension range; determining conditional transformation coefficients from mathematical expression; making plot of conditional transformation coefficient change as a function of time; determining increase of controllable initial specific surface of particles to be loosened and halving ultrasound power when controllable initial specific surface of particles to be loosened is increased by an order.
EFFECT: reduced specific power consumption.
FIELD: geotechnology, particularly bore mining in wide range of mining and geological conditions.
SUBSTANCE: method involves drilling bore extending for the full thickness of underground mineral formation; cutting the underground mineral formation in chamber coaxial to the bore with the use of water-jet devices. Before hydraulic formation cutting rock massif is moistened by supplying pressurized water in bore for a time period enough to expand moistened zone for necessary distance, wherein water pressure is less than pressure of hydraulic formation cutting. After formation moistening water-jet device is lowered in the bore to cut mineral in moistened zone adjoining the bore. After that formation moistening and cutting operations are repeated to create chamber having predetermined dimensions.
EFFECT: reduced power inputs for hydraulic rock cutting.