Rock pressure control method
SUBSTANCE: method includes driving of development-temporary workings, working off of primordial chambers of tapered section, their filling with curing mixture forming artificial pillars, formation of massive ore pillar between artificial pillars. Rock pressure is reallocated on artificial pillars. Touchdown working is driven along ore pillar symmetry axis by contact with ore deposits in overlying roof rocks. Blasting wells are drilled from it radially within outlines of natural arches so that ends of these wells most accurately form sizes and surface of line of natural arches in compliance with estimated ultimate strength of overlying rock massif. Complete discharge of massive ore pillar is performed by induced caving of roof rock between artificial pillars on chambers expanding upwards, support of artificial pillars by caved rock is provided. Massive ore pillar stocks are developed with support of overlying roof rock by natural arches resting upon artificial pillars and retaining slopes formed near side surfaces of artificial pillars during loading of broken ore.
EFFECT: increasing reliability of rock pressure control and labour safety.
2 cl, 4 dwg
The technical solution relates to the mining industry and can be used for management of mountain pressure in underground development of horizontal and sloping ore deposits.
There is a method of management of mountain pressure (A.S. USSR №998759, E21C 41/06, publ. in BI No. 7, 1983), including the maintenance of overlapping species ore and artificial pillars of hardening bookmarks, the collapse of rocks and mining excavation area cameras with redistribution of rock pressure artificial pillars, and in the centre of the excavation area leave massive ore pillar, and after working the whole part of the produce tab chambers located on either side of him, and then carry out the excavation of a massive pillar.
The disadvantages of this method are the loss of ore in mezhdurebernyh ore reserves, the ability of dynamic manifestations of rock pressure in the destruction of these pillars pressure of overlapping species and the possibility of air strikes on business horizons when Samoobrona roof rocks, which adversely affects the safety of underground workers.
The closest in technical essence and essential features to the proposed technical solution is the method of controlling rock pressure (A.S. USSR №1606667, AS 41/16, publ. in BI No. 42, 1990), including maintaining patient the surrounding rocks artificial pillars of the hardening of the mixture, the formation of mining the ore massive ore pillar between artificial pillars and redistribution of rock pressure on the artificial pillars of the mining stocks massive ore pillar and the collapse of the roof rocks, and artificial pillars and the Central part of the massive ore pillar first load testing cameras its boundary parts of the artificial pillar, and then produce a complete unloading massive ore pillar forced the collapse of the roof rocks between artificial pillars formed on the camera, this creates a backwater artificial pillars collapsed rocks, and then work out fully the massive reserves of ore pillar with the formation of the side surfaces of the artificial pillar retaining slopes.
The main disadvantage of this method is the high irregularity of the workings of the roof rocks above artificial pillars of the hardening mixture that creates high stress concentration around these workings and the probability of dynamic manifestations of rock pressure in mines during operations on the forced collapse of overlapping species. In addition, the location of drilling workings on artificial pillars of the hardening of the mixture does not faithfully reproduce well the contours of the set of natural balance rocks on the massive ore entirely.
Mining practice shows (Kartozia B.A., V.N. Borisov. Engineering problems of the mechanics of underground structures: a Training manual. 2nd ed., revised and enlarged extra - M.: Publishing house of Moscow state mining University, 2001, p.12)that the sets of natural balance in rocks, usually formed by a parabolic surface. The height h of the code of the natural equilibrium depends on the tensile strength of rocks.
When implementing a known method of controlling rock pressure get in overlapping rocks arch atroveny shape, which is formed of flat lateral surfaces and is not a true arch natural equilibrium. This can lead to Samoobrona rocks over a large area before they reach the true arch form natural equilibrium and, consequently, to the air strikes in the mines.
Thus, not sufficiently accurate formation of the arch of the natural equilibrium in the overlapping rocks does not provide sufficient reliability management of mountain pressure in a known technical solution. The dynamic manifestations of rock pressure and collapse of the roof rocks negative impact on safety.
Technical problem - increasing reliability of control of mountain pressure due to more accurate formation of the arch of the natural equilibrium in the overlapping rocks and is improving safety by reducing the likelihood of dynamic manifestations of rock pressure and mass collapses.
The problem is solved in that in the method of controlling rock pressure, including the sinking of training and development workings, mining primary camera trapezoidal sections and filling them hardening the mixture with the formation of the artificial pillar, the formation of massive ore pillar between artificial pillars and redistribution of rock pressure on the artificial pillars partial mining stocks edge parts of the massive ore pillar extending up cameras in artificial pillar, holding a boarding production in caving the roof rock, the drilling of her blastholes within the arch of the natural equilibrium of overlapping roof rocks above the massive ore as a whole, complete unloading massive ore pillar forced the collapse of the roof rocks between artificial the pillars extending up to the camera, creating a backwater artificial pillars collapsed rocks and mining stocks massive ore pillar with maintaining overlapping species of the roof arch natural equilibrium, based on artificial pillars and formed at side surfaces of the artificial pillar in the process of shipment of broken ore retaining slopes, in accordance with the proposed technical solution boarding the production takes place along the axis of symmetry of the masses of the main ore pillar in contact with the ore Deposit, and blastholes from boarding generate Buryats radially so that the ends of these wells accurately formed to the dimensions and the surface contour of the specified set of natural balance in accordance with the calculated tensile strength of the array of overlapping species.
Conducting boarding develop along the axis of symmetry of the massive ore pillar in contact with the ore Deposit allows you to place it outside the zones of high stress concentration created by the redistribution of rock pressure on the artificial pillars partial depletion of reserves massive ore pillar. This reduces the likelihood of dynamic manifestations of rock pressure in boarding developing during work on forced collapse. In addition, there is no need to perform two types of planting mines (known in technical decision - drifts and russeck), which further reduces the stress concentration around the landing generation and reduces the total cost of conducting a boarding workings and drilling blastholes 10÷12%.
Blasthole drilling out of the housing production in the radial direction and more precise control of the length and angles of the blastholes most accurately to form any size and surface contour of the arch e the natural balance in accordance with the calculated tensile strength of the array of overlapping species.
The combined effect of the above distinctive features allows you to achieve the solution of a technical problem of increasing the reliability of control rock pressure due to more accurate formation of the arch of the natural equilibrium in the overlapping rocks and increase safety by reducing the likelihood of dynamic manifestations of rock pressure and mass collapses.
Suitable partial mining stocks edge parts of the massive ore pillar extending up cameras at the adjacent artificial pillars be implemented in such a way that the camera positioned on the same stages of testing, form a terraced front of wastewater treatment works.
This further reduces the stress concentration along the front of the treatment works, reducing the likelihood of dynamic manifestations of rock pressure and mass collapses, resulting in increased safety.
Thus, the combined effect of the above signs provides the most effective solution to the problem.
The essence of the technical solution is illustrated for the control of rock pressure in underground development of horizontal ore deposits and drawings, in which figure 1 shows a vertical section of the ore body orthogonal to the direction of advancement of the front of istih works (section a-a in figure 2) at the time of drilling operations on the set of natural balance over extreme massive ore as a whole. figure 2 - plan of horizon edition (cross-section B-B in figure 1); figure 3 - the same section a-a in figure 2 at the time of completion of the arch natural equilibrium over at massive ore wholly and holding brown-heading openings therein; figure 4 is the same section a-a in figure 2 at the time of practicing extreme massive ore pillar.
The proposed method is implemented as follows.
Ore deposits 1 (1) receive training and rifled generation 2 and work out the primary chamber 3 a trapezoidal cross-section (figure 2) at full capacity ore deposits 1 brown-explosive way. After a failover of the primary chamber 3 a trapezoidal cross-section over the entire length of z, they are filled with hardening the mixture with the formation of the artificial pillar 4, between which is formed a massive ore pillar 5, parallel to the front 6 of the treatment works. Redistribution rock pressure on the artificial pillars 4 produce partial mining stocks edge parts of the massive ore pillar 5 extending up by the camera 7, the artificial pillar 4 (figure 1). To ensure the safety of artificial pillar 4 should preferably be drilling wells 8 and blasting layers (figure 2) with a mechanical release and shipment of broken ore 9.
After redistribution of rock pressure artificial pillars 4 are boarding the production of 10 the overlapping rocks 11 along the axis of symmetry of the massive ore pillar 5 in contact with the ore Deposit 1. From boarding generate 10 Buryats radially blastholes 12 within the vault 13 natural equilibrium overlapping species 11 above the massive ore entirely 5. Blastholes 12 Buryats so that their ends most accurately formed to the dimensions and the surface contour of the arch 13 natural balance in accordance with the calculated tensile strength of the array of overlapping species 11. For the forming of span L arch 13 natural equilibrium (figure 1) above the massive ore wholly 5 height h of the arch 13 natural equilibrium will be determined by the known formula:
where f is the fortress of overlapping species 11 on a scale professional Dev (f=R/10);
R is the calculated resistance of overlapping species 11, MPa.
Blastholes 12 have different lengths. The minimum length lminwill have vertical blastholes 12 (1):
where hin- the height of the planting production 10.
The maximum length lmaxwill have a blast holes 12 extending up over the chambers 7:
where W is the length of the line of least resistance;
bin- the width of the planting production 10.
The angle α between the explosive wells 12, respectively, are determined from the relation α=arctan (W/h).
Then make a forced collapse of overlapping species 11 is rowly between artificial pillars 4 extending up camera 7, as a result, achieved full unloading massive ore pillar 5. Collapsed rocks 14 fill extending up camera 7 (figure 3), creating a backwater for artificial pillar 4. The massive reserves of ore pillar 5 work under the collapsed rocks 14, after which the developed space 15 remain formed at the side surfaces of the artificial pillar 4 retaining slopes 16 (figure 4) and maintaining the overlapping species 11 of the roof is vault 13 natural equilibrium, based on artificial pillars 4 and formed at their side surfaces in the process of shipment of broken ore 9 retaining slopes 16. Powerful enough for ore deposits 1 massive ore pillar 5 practice with division into padati, drilling wells 8 and blasting from brown-heading openings 17. After full testing of massive ore pillar 5 over the entire length of z, the front 6 of the treatment works is shifted to the right and the cycle of operations management rock pressure in underground development ore deposits 1 is repeated.
It is advisable the breaking of the ore Deposit 1 in the adjacent massive ore pillars 5 lead the way (figure 2), extending up to the camera 7 is positioned on the same stages of testing, form a terraced front 6 sewage treatment works. This reduces the stress concentration along this front 6 treatment p the bot on artificial pillars 4 25÷30%, resulting in further improved safety.
1. The method of controlling rock pressure, including the sinking of training and development workings, mining primary camera trapezoidal sections and filling them hardening the mixture with the formation of the artificial pillar, the formation of massive ore pillar between artificial pillars and redistribution of rock pressure on the artificial pillars partial mining stocks edge parts of the massive ore pillar extending up cameras in artificial pillar, holding a boarding production in caving the roof rock, the drilling of her blastholes within the arch of the natural equilibrium of overlapping roof rocks above the massive ore as a whole, complete unloading massive ore pillar forced the collapse of the roof rocks between artificial pillars extending up to the camera, creating backwater artificial pillars collapsed rocks and mining stocks massive ore pillar with maintaining overlapping species of the roof arch natural equilibrium, based on artificial pillars and formed at side surfaces of the artificial pillar in the process of shipment of broken ore retaining slopes, characterized in that the planting production takes place along the axis of symmetry massiveh the ore pillar in contact with the ore Deposit, and blastholes from boarding generate Buryats radially so that the ends of these wells accurately formed to the dimensions and the surface contour of the specified set of natural balance in accordance with the calculated tensile strength of the array of overlapping species.
2. The method according to claim 1, characterized in that the partial mining stocks edge parts of the massive ore pillar extending up cameras at the adjacent artificial pillars are so that these cameras are located on the same stages of testing, form a terraced front of wastewater treatment works.
FIELD: process engineering.
SUBSTANCE: invention relates to mining and may be used in ore dressing. Proposed complex comprises receiving hopper, crushing and screening unit, assembly to feed ore to separation, ore control station, ore lump separators, concentrate and reject discharge conveyors arranged in underground openings. Assemblies feeding ore to separation and X-ray-type separators are arranged on two levels in long openings communicated by box holes to accumulate and feed ore to separators by gates arranged at their outlets. Said box holes are located at 5-7 mm from each other to feature diameter of 1.0-1.5 mm. Assembly feeding ore to separation represents combination of openings, each being 120-40 0m-long and having 2.5-3 m-diameter, and connected with crushing and screening assembly to allow every opening to feed ore of particular size grade to box hole. Every separator comprises, at least, one additional channel for cleaning rejects after separation of concentrate in main channel. Conveyor belts of said main and additional channels are located one above the other. Openings accommodating said assembly feeding ore to separation and separators are spaced apart for 15-20 m along vertical. X-ray-type separator channel comprises, at least, one x-ray useful component content analyser connected with separation device made up of, at least, one pneumatic blowout nozzle. Every aforesaid assembly is equipped with conveyor provided with unloading device driven along openings length. Crushing and screening unit allows producing four flows of ore sized to (-300+120), (-120+50), (-50+15), (-15+0) mm, with (-15+0) mm-ore directed to concentrate discharge conveyor, the remaining flows being used for filling box holes.
EFFECT: higher efficiency of separation and quality of concentrate, reduced costs.
8 cl, 3 dwg
SUBSTANCE: method to increase stability of a ceiling in downward slicing development of a deposit with backfilling includes serial tunnelling and backfilling of parallel mines - stope entries, leaving ore pillars with width equal to one, two or three spans of mines, backfilling of mines with a concrete mix, and after backfilling hardens, ore pillars left between concrete strips are mined. At the same time the vault of stope entries is arranged as deep, besides, ore pillars are left in the roof between concrete backfilling of adjacent stope entries.
EFFECT: higher stability of a mine ceiling.
SUBSTANCE: extraction sections or blocks are mined with vertical cuts including two vertical layers of various thickness, the internal one of which is mined by means of drilling method of large-diameter scavenger wells and external one is not mined. In order to ensure safe labour conditions at upper drilling level and uniform output of mineral deposit extracted during large-diameter well drilling, drilling of those wells is performed by shrinking of broken mine rock in them. If the deposit is represented with a bench of conformable beds, the cutting height is accepted equal to total thickness of all beds of that bench, including intermediate rocks. Drilling of scavenger wells is performed throughout the cutting height with shrinkage of broken mine rock in them, and separation of mineral deposit and hollow rock is performed at the stage of general release of racks by means of selective bed-by-bed supply.
EFFECT: creation of safe conditions from the point of view of hydrogeology for high-efficiency development of reserves of extraction sections or blocks outlined with natural or artificial barrier or inter-block pillars.
3 cl, 2 dwg
SUBSTANCE: weakening a spring of natural balance at both sides of the block and damaging a key stone is done simultaneously by exploding rows of parallel wells drilled at the borders with interchamber sight pillars and along the axial line of the stope, in sections length of which is equal to the thickness of the damaged layer. Weakening of the spring at both sides of the block and damaging of the key stone is done by sectional explosion of clusters of parallel adjacent wells: linear ones at borders with interchamber sight pillars and bulk ones along the axial line of the block. The spring at both sides of the block is weakened ahead of erection of artificial interchamber sight pillars.
EFFECT: improved efficiency and safety of production works.
3 cl, 4 dwg
SUBSTANCE: when developing mineral deposits in the form of ore bodies, ore zones are divided along the depth into stories and levels and are mined top-down with sloughing of the above rock massif or filling of the mined space with foreign ground material with lower strength and resistance of rock massif. Ore bodies are mined bottom-up with a layer method with the limited minable width of the layer using the bore hole method from drilling crosscuts with application of drilling mechanisms and conveyor transportation of ore material. Parameters of the broken layer comply with receiving capacity of conveyors that supply the material into the ore chute, and from there into the transport lifting vessel. Mining is carried out starting from the hanging wall of the deposit, and gradually, layer by layer is mined towards the underwall of the deposit. To collect the material sliding off the conveyor flight and during mining of intermediate layers between the extraction ones along the height and ground later, trenches are developed at the bottom. From the trenches the material is sent to a common conveyor via chutes.
EFFECT: complete mining of the deposit, prevention of weakening in the surrounding massif of the mined space.
SUBSTANCE: air supplying gate and the main air gate pass along opposite boundaries of mine field so that they run ahead of extraction front through the length equal to distance between axes of the rooms. At that, rooms have the length equal to width of mine field and are located between air supplying gate and ventilation air gate. Fresh air is supplied through the tunnel located in front of extraction front. At that, return ventilation air is removed along auxiliary air gate.
EFFECT: improving concentration of mining operations, reducing volumes of preparatory mine work, and decreasing air leaks through the worked-out area.
SUBSTANCE: method consists in maintaining the stable state of worked-out area with inter-chamber support pillars; at that, sizes of inter-chamber support pillars are determined from actual pressure of rocks on them, which are located inside the natural arch in its final position, and the pillar located at the joint of natural arches is determined considering the pressure on abutments of arches of those rocks which are located above the outlines of natural arches.
EFFECT: reducing the losses of developed mineral resources and improving the safety of mining operations.
SUBSTANCE: method for development of thick flat beds of minerals includes division into layers, arrangement of development openings in upper and lower layers, strengthening of development openings. Layers are developed downstream in longwalls. Development openings of lower layer pass under edge portion of bed, formed in process of upper layer longwalls development. Prior to arrangement of development openings in the lower layer, edge part of bed is weakened over route of development openings arrangement in the lower layer, for instance, by means of wells drilling in bed or creation of slot in bed. Development openings of the lower layer are fixed by anchors, at the same time depth of bed weakening is accepted as larger than width of development opening in the lower layer. Length of anchors is accepted as larger than distance from lower layer openings to bed roof, and depth of bed weakening above route of lower layer development openings arrangement is determined from the expression.
EFFECT: invention makes it possible to reduce labour intensiveness of works and costs for strengthening, to increase speed of development openings arrangement.
2 cl, 2 dwg
SUBSTANCE: invention may be used to develop bedded deposits, for instance potassium ones, in case of reverse order of mining with unstable immediate roof. In process of panel preparation, tunneling combine is used to arrange one transport, two ventilation drifts and also mined slots on workable beds for the whole length of panel. Conveyor drift is tunneled with cutter-loader in sections as mining front advances. Stopes are mined on one of half-panels from conveyor drift. Transport drift is expanded by cutter-loader to section of its working element by periodic cuts, as mining front advances by the length multiple of distance between axes of stopes. During preparation of panel, ore passing wells are drilled from field conveyor drift down to design elevation of bed conveyor drift soil, and these wells are opened when conveyor drifts are tunneled on mined beds, as mining front advances. Distance between ore passing wells is selected as multiple of distance between axes of chambers.
EFFECT: invention makes it possible to significantly reduce scope of mining-preparation works required to commission the panel, and to reduce time of its preparation.
8 cl, 2 dwg
SUBSTANCE: method includes preparation and cutting operations, creation of horizontal 1,5,6,8,9 and vertical delineation 7 and separation artificial massifs 10, clearing withdrawal and filling in of developed area 12. All of the vertical artificial massifs 7,10, parallel to one of mutually perpendicular axis of a developing area horizontal cross section, to be trapezoid shaped with a long bottom foundation, to the delineation ones - rectangular shaped with a vertical side along the ore body contour 4 or developing area, the separation massifs 10 - isosceles shaped, and the trapezoid sides inclination angle defines form an equation tgα =hστ/(Poλσ - (Pa-Pb)τ), where h - floor height, m; σ and τ - the artificial massif compression and shear strength limits accordingly, MPa; λ - horizontal stress factor; Pa, Pb, Po - natural arch limit rock weight, part of the top artificial border massif weight and ore massif in a gap block weight accordingly. H.
EFFECT: invention allows creating a safe environment condition for high efficiency rate mine sections, delineated with artificial separation slabs, treatment.
FIELD: mining industry.
SUBSTANCE: method includes use of screw-drilling machine for driving of several first ventilation shafts in ore body and driving several second shafts, while second and each second shaft crosses, at least, one matching first shaft, forming first support walls, supporting ceiling. First supporting ceilings consist of ore body zones between neighboring second shafts, each first support wall has portion of at least one first shaft, passing horizontally through it. Horizontal channels are formed, each of which is placed transversely to matching second shaft between appropriate portions of first shaft, formed in adjacent support walls, for forming of group of continuous ventilation shafts. Second shafts are filled for forming second supporting walls, supporting well ceiling, and first supporting walls are extracted. First ventilation shafts can be made parallel to each other. Second shafts may be directed perpendicularly relatively to first ventilation shafts. In ore body air-outlet and air-inlet ventilation mines can be formed, placed at distance from each other along horizontal line, while first or each first ventilation shaft passes through portion of ore body between air-inlet and air-outlet ventilation mines. Driving of second or each second shaft can be performed by cutting machine, or by drilling or explosive mining.
EFFECT: higher efficiency.
7 cl, 11 dwg
FIELD: mining industry.
SUBSTANCE: method includes partial filling of extracted space of side and central mains by filling stripes from lava extracting shafts. At center of semi-lava on the side of massive, wherein next extractive column will be cut, filling shaft is additionally driven, wherefrom full filling of space between central fill stripe and fill stripe on the side of massive is performed. Preparation of next extraction column is performed under protection of erected fill stripes.
EFFECT: higher safety, higher efficiency.
FIELD: mining industry.
SUBSTANCE: method includes cutting well field portions by driving bed and field mines. At mine fields to be prepared with weak rock stability driving of several field preparatory mines is performed at portion of field with width determined from formula. Bed preparation mines on same portion are driven alter, with displacement of cleaning operations from these may be driven in portions, at which their stability is provided for technological time period with inter-drift blocks of given rigidity.
EFFECT: higher safety.
2 cl, 1 dwg
FIELD: mining industry.
SUBSTANCE: method includes extraction of mineral resource by underground mine method in liquid environment, under protection of water-resistant rock massif. Full flooding of auxiliary extracting and preparatory mines is performed, which provide for start of wiping operations, with working liquid, neutral relatively to mineral resource and enveloping rocks and being under pressure, matching value of pressure at depth of mine. Process of removal of separated rock beyond underground flooded space is synchronized with replenishment of working liquid volume in this space. Working liquid pressure can be formed by effecting it with force liquid, which is placed either in mine shaft, hydraulically connected to lower flooded auxiliary extracting mine, or in mine shaft and force column, placed on earth surface, above mine shaft, and hydraulically connected thereto. Required height of force liquid column is determined from mathematical expressions. After mineral resource extraction is finished within mine field, flooded extracted space is used for placement of toxic and non-toxic wastes of industries or strategic objects, while process of transfer of wastes or strategic objects into liquid environment is performed synchronously with removal of working liquid beyond flooded space in volume, equal to volume of transferred wastes or strategic objects.
EFFECT: higher safety.
3 cl, 1 dwg, 1 ex
FIELD: mining industry.
SUBSTANCE: method includes separating resources of all levels on blocks, in form of upwardly elongated hexahedrons. Blocks on adjacent levels are positioned in staggered order with displacement of some of them relatively to others for half of blocks width. Resources of each block within limits of hexahedron are divided on two portions: hexagonal chamber inside the block and block itself of same hexagonal shape on all six sides of chamber. Preparation and cutting of chamber resources is realized by driving field level drifts and mines, intermediate sub-level drifts and mines, and also level and sub-level orts and drifts, driven through mineral resource, from which resources of chambers and blocks are drilled and exploded. Extraction and outlet of mineral resource is performed in three rows - first chamber resources, than inter-chamber blocks under protection of ceiling blocks, after that ceiling blocks deposits. Outlet of resources from chambers and blocks is performed trough ends of level orts and mines, an also through ends of intermediate sub-level mines.
EFFECT: better use of mineral resources, lower laboriousness, lower costs, decreased block preparation time.
FIELD: mining industry.
SUBSTANCE: method includes determining width of edge zones of block, subjected to influence from support pressure, then preparatory mines are driven along block at limits of these zones and permanent rigid supports are erected therein. After that portion of block from preparatory mines to block center is extracted.
EFFECT: increased mineral resource yield coefficient, safer extraction of inter-panel support blocks, without breaking their carrying ability and without using backfill materials.
FIELD: mining industry.
SUBSTANCE: method includes dividing a level on hexahedral sections of upwardly elongated shape and is prepared by driving of field backup drift. From drift below each section shafts are driven, from which along mineral resource ascending shafts are drilled. For drilling chambers deposits by wells, sub-level drift is driven along mineral resource, access to which is provided by driving field sub-level drift and shafts. Outlet of extracted rock is performed through ends of shafts. After letting out rock from all sections ceiling beam is brought down and also let out through ends of shafts.
EFFECT: lower laboriousness, lower costs, higher efficiency, higher personnel safety.
FIELD: mining industry.
SUBSTANCE: method includes separation of a level on hexahedral sections of upwardly elongated shape and is prepared by driving of field backup drift. From the drift shafts are driven below each section, from which along mineral resource ascending shafts are drilled, meant for drilling from them by horizontal or slanting wells and extracting sections resources. Outlet of extracted rock mass is performed through ends of shafts. After outlet of rock mass from all sections ceiling beam is brought down and let out also through ends of shafts.
EFFECT: lower laboriousness, lower costs, higher efficiency, higher personnel safety.
FIELD: mining industry, particularly methods of underground mining.
SUBSTANCE: method involves advancing breakage face in under-roof layer; drilling bores in the under-roof layer and injecting weakening reagent to separate zones through the bores; drilling blind drift in front of the breakage face, wherein the blind drift has length of not less than breakage face length; drilling bores for following weakening reagent injection from the blind bore; additionally boring intermediate bores between above bores for following gas exhausting; performing under-roof layer development so that non-developed bank is left directly above breakage face support; performing stepwise weakening reagent injection into corresponding bores and evacuating gas from intermediate bores; leaving bores filled with weakening reagent for 1-2 days and supplying the weakening reagent into intermediate bores.
EFFECT: increased efficiency of mineral preparation.
3 cl, 3 dwg
FIELD: mining, particularly methods of underground mining.
SUBSTANCE: method involves cutting mineral by hydrocutting machines and headers from face massif in rectangular blocks; putting on metal cases on the blocks to facilitate loading-and-unloading operations and transportation; loading the cut blocks on hauling truck along side previously opened from breakage face side, wherein the truck position is fixed by spacing apart hydraulic post permanently connected to the hauling truck; moving loaded hauling trucks inside breakage face by hauling tracks along channel, V-shaped guiders or guiding rails with the use of haulage cargo winches arranged in berms near conveying tunnels or with the use of independent drives, wherein the conveyance is carried out to conveying and venting tunnels abutting the breakage face; loading mineral blocks from hauling trucks onto wheeled transport platforms without block turning for following transportation. Distance between rail tracks is equal to rail track width to transport blocks on paired wheeled platforms in which locomotive moves along medium track. Working area face is strengthened by individual hydraulic posts and metal hydraulic jacks and metal roof bars or by mechanized face support. The face support has fastening sections including above hydraulic jacks and roof bars, as well as wheel guiding means sections and hydraulic movers with control panel arranged on each fastening section pair. The roof is controlled by partial filling the excavated space with mineral blocks. Distance between neighboring mineral units arranged on one paired wheeled platform and on adjacent platforms may be identical and equal to distance between guiders in breakage heading. Mineral blocks are cut in several rows, wherein depth of slot at seam ground and roof is two times as thickness of mineral blocks to be cut.
EFFECT: increased output, improved safety and ecology.
3 cl, 14 dwg