Procedure for development of steeply pitching beds of coal
SUBSTANCE: invention refers to mining and can be implemented at coal mines during development edge and steeply pitching beds of coal by hydro-cutting. The procedure consists in exposing extraction field, in dividing it to extraction blocks, in leaving inter-block coal solids, in exposing extraction blocks with ventilation and accumulating crosscuts, in driving load handling slopes, ventilation furnaces and pulp furnaces, in dividing extraction blocks to stories, in driving story extraction drifts, and in mining stories of extraction blocks with a system of story hydro-cutting by passes along strike from story extraction drifts and facilitating rock falling in stripped area. Mining of stories is performed in a descending order. Exposure of extraction field is carried out at flanks with ventilation and accumulating crosscuts wherefrom coal is extracted from solids with the system of extraction; also stripped area is stowed with non-combustible fill; the solid functions as a protection for crosscuts forming a barrier solid. Block mining within ranges of an extraction pillar is performed successively starting from a mining block adjoining the formed barrier solid. Along the whole length of the extracting pillar inter-block coal solids are mined together with stories of adjacent mined extraction blocks.
EFFECT: increased safety of miners labour due to elimination of endogenous fires and increased efficiency owing to extraction of inter-block coal solids.
The technical solution relates to the mining industry and can be used in coal mines during the development of steep and steeply inclined coal seams by gidrootbojkoj.
There is a method of developing a powerful steep layers gidrootbojkoj cast resin hardening bookmark by RF patent No. 2084631, CL IS 41/18, publ. in BI No. 20 for 1997, including the dissection and preparation of the extraction field of ventilation and excavation drifts, precinct crosscuts, passed from the Central field of the slope, separating floors for padati, layer in the recess coal giant with benches along strike and submission cast hardening mixture in a goaf each Zachodni pipeline. After working the next zagadki on the border in the overlying backfill array wash cavity, mounted filling the pipeline to waste Zachodni from the Central slope on the ventilation drift, but the outlet is attached to the knee, which led to a specified cavity, setting the outlet pipe filling pipe above the top of the roof zagadki. After that is installed in the roadway of the bridge and serves cast hardening the mixture.
The considered method the following major drawbacks:
- two times, compared to mining system sublevel gidrootbojkoj the collapse of the rocks in the developed space (hereinafter referred to GIP), increases the amount of penetration of preparatory workings in each excavation unit due to the need for driving under the hardened filling the array each exhaust substage new sublevel drifts used as ventilation, on which lay the pipeline for submission to the goaf cast hardening mixtures;
- long-term mining areas, reaching 1.5÷2 years, due to the time spent on driving sublevel ventilation drifts under laid cast hardening mixture previously used podatkami, and the time required for hardening and curing of cast-curing mixture, served in a goaf;
- the high cost of coal, due to material and financial costs of production, transportation and just filling out space cast hardening the mixture.
Due to the above disadvantages are considering how to develop powerful steep layers gidrootbojkoj cast resin hardening bookmark finds limited use in practice.
The closest in technical essence and essential features is the way to develop a powerful abrupt layers sublevel getrootpane (see Breadboard the e pattern of development of coal seams Prokopyevsk-kisilevsky field systems sublevel getrootpane (GIP). Instruction on safe use of technological schemes of development of coal seams Prokopyevsk-kisilevsky field systems sublevel getrootpane (GIP), Prokopyevsk, 2006. P6, 7, 10, 11, 71 and 209). The method includes the opening of the extraction field, dividing it into excavation blocks, leaving between them interblock coal pillars used as a preventive, Stripping, excavation and ventilation units and accumulating crosscuts, sinking in interblock coal pillars krutogolovy rays, vent furnaces and polypoidy, division of mining blocks on padati, sinking sublevel mining drifts, practice podathey excavation blocks sublevel getrootpane the benches along the strike of the sublevel mining drifts with the collapse of rocks in the developed space. Over podathey are in descending order.
The disadvantage of this method are the large deadweight loss of coal reserves within the opened excavation fields, due to the need of leaving in the developed space interblock coal pillars between the exhaust excavation blocks. If the length of the excavation units, not exceeding the strike reservoir 150 m, interblock coal pillars left in the developed space on the entire height of the floor as profilactics them, have a width of not less than 25÷30 m along the strike of the seam). This results in only one excavation field length 900÷1000 meters and more loss, leave in interblock coal pillars that reach 20÷25% of the coal reserves contained in the working excavation field.
As a result of abandonment in the developed space interblock coal pillars the risk of endogenous fires increases substantially. This is due to a tendency of coal to spontaneous combustion, and by the fact that the movement of air leakage in the developed space occurs in the contact zone goaf with coal array, i.e. along the interblock coal pillars left in the developed space. It should also be noted that in the developed space foci of spontaneous combustion of coal occur in clusters loosened coal formed during deformation and fracture of the outer part of the coal mass under the action of the supporting rock pressure (including interblock coal pillars).
When developing abrupt layers interblock coal pillars left in the developed space, usually located coaxially with liblocale coal pillars left earlier in the development of the overlying horizon. In the result, along coaxially located interblock coal pillars of endogenous fire is often perepuskajutsja existing excavation blocks at the top, previously worked, horizons. Therefore, to prevent bypass of fires from the overlying waste horizons in existing excavation blocks, mines practicing leaving margaritone coal pillars, which also leads not only to additional deadweight loss of coal reserves, but also to increase endogenous risk of fire. While not fully eliminated and bypass the heated mass of coal from the upper horizons after undermining margaritondo coal pillar and its destruction.
- improving the safety of miners by eliminating the possibility of occurrence of spontaneous combustion of coal within the working extraction field, and also bypasses endogenous fires from the upper horizons working in the mining field;
- increase of economic efficiency of doing cleaning work in the development of steep seams sublevel gidrootbojkoj coal with the collapse of rocks due to the mining fields without leaving in the developed space interblock coal pillars.
The technical problem is solved in that in the method development of steep coal seams, including the opening of the extraction field, dividing it into excavation blocks, leaving interblock coal pillars, opening excavation blocks ventilation and accumuler the sponding crosscuts, sinking in interblock coal pillars krutogolovy rays, vent furnaces and polypoidy, division of mining blocks on padati, sinking sublevel mining drifts, practice podathey excavation blocks sublevel getrootpane the benches along the strike of the sublevel mining drifts with the collapse of rocks in the developed space, with the development of podathey are in descending order, according to the technical solution of the opening of the extraction field exercise on the flank vent and accumulating crosscuts, of which the mining system with a mined-out space of non-combustible filling material produce hollow coal from pillar that serves as security for these crosscuts, forming a barrier pillar. Mining excavation units within the extraction column is produced sequentially, starting from excavation block adjacent to the formed barrier pillar. Throughout the excavation post interblock coal pillars work together with podatkami related working mining block.
This set of features will eliminate the possibility of occurrence of spontaneous combustion of coal in mined-out space to be mined coal seams, and the bypass of endogenous fires previously worked overlying gorizontov the result of the practical implementation of the proposed technical solution mining field throughout practice without leaving interblock coal pillars, to increase the efficiency of mining operations due to the additional volume of the extracted coal and improve the safety of miners by preventing accidents caused by endogenous fires that occur in the developed space.
The essence of the technical solution is illustrated by the example of the implementation of the proposed method of development of steep coal seams (next - method) within the extraction field and drawings, in which figure 1 shows a diagram of the testing of the first extraction unit; figure 2 - diagram of the testing of the second extraction unit.
The method is as follows. The opening of the extraction field of steep coal seam length 900÷1050 meters and more produce on the flank vent 1 (figure 1) and accumulates 2 crosscuts between which are polpaico 3 and gruzopodemnoe scat 4. From polpaico 3 and gruzopodemnogo Stingray 4 system testing with the mined-out space of non-combustible filling material produce hollow coal from pillar that serves as security for these crosscuts 2, 1, forming a barrier pillar 5.
From the formed barrier pillar 5 at a distance of 100÷150 m vent 6 and accumulates 7 crosscuts reveal the first excavation unit 8. To prepare for the development of the first excavation unit 8 system GIP between the ventilation verslagen 6 and accumulare what they verslagen 7 interblock coal pillar 9 pass ventilation furnace 10, gruzopodemnoe the ramp 11 and polpaico 12. Produce division extraction unit 8 on poletai. Pass sublevel mining drifts. Over podathey excavation unit 8 produces sublevel getrootpane the benches along the strike of the sublevel mining drifts with the collapse of rocks in the developed space. The development of podathey in excavation unit 8 produces descending from the barrier pillar 5 in the direction of the interblock coal pillar 9, which on the longwall block 8 is security for crosscuts 6, 7, venting of the furnace 10, gruzopodemnogo the ramp 11 and polpaico 12.
After testing the first excavation unit 8 (figure 2) ventilation verslagen 13 and a storage verslagen 14 reveal the second extraction unit 15, adjacent to the interblock coal pillar 9, which are ventilation furnace 10, gruzopodemnoe the ramp 11 and polpaico 12 used in the development of the first excavation unit 8. Between the ventilation verslagen 13 and a storage verslagen 14 interblock (security) coal pillar 16 of these crosscuts 13, 14 are polpaico 17, vent the furnace 18 and gruzopodemnoe the ramp 19. Over podathey in excavation unit 15 is also produced in descending order sublevel getrootpane the benches along the strike of the sublevel mining the gr is s with the collapse of rocks in the developed space. When developing the second extraction unit 15 in the refinement also include interblock coal pillar 9. Do this for each substage of the second extraction unit 15 sublevel drifts 20 cut interblock coal pillar 9 and work it together with the respective substage of the second extraction unit 15.
After testing the second extraction unit 15 produces the Stripping and mining of the next excavation unit (not shown)adjacent to the interblock coal pillar 16, which includes testing in the same way as described above about the development interblock coal pillar 9. When mining within the mining field subsequent excavation units in their development also include interblock coal pillars. Thus, through joint testing interblock coal pillars with podatkami adjacent mined excavation units throughout the extraction field form a single goaf, consisting of collapsed rocks.
Method development of steep coal seams, including the opening of the extraction field, dividing it into excavation blocks, leaving interblock coal pillars, Stripping, excavation and ventilation units and accumulating crosscuts, sinking in interblock coal pillars krutogolovy rays, vent furnaces and polypoidy, division of mining blocks on p is Datai, sinking sublevel mining drifts, practice podathey excavation blocks sublevel getrootpane the benches along the strike of the sublevel mining drifts with the collapse of rocks in the developed space, with the development of podathey are in descending order, characterized in that the opening of the extraction field exercise on the flank vent and accumulating crosscuts, of which the mining system with a mined-out space of non-combustible filling material produce hollow coal from pillar that serves as security for these crosscuts, forming a barrier pillar, and the refinement of excavation units within the extraction column is produced sequentially, starting from excavation block adjacent to the formed barrier pillar, with this all over excavation post interblock coal pillars work together with podatkami adjacent mined excavation blocks.
FIELD: oil-and-gas production.
SUBSTANCE: stowing mixture contains, wt %: halite wastes of reprocessing of potassic ores 96.5-98.3, bonding agent - magnesia cement 1-2, lignosulfonate 0.7-1.5%.
EFFECT: achievement of required strength of backfilling at minimal content of bonding agent.
1 tbl, 1 dwg
SUBSTANCE: invention refers to mining industry, and namely to the method used for hydraulic filling of long single mine workings. It involves influence of retaining and filtering connection straps, installation of pulp pipeline, and supply of filling pulp. Water is drained via drain holes made in connection straps installed on the side opposite to the pulp supply. Filling pulp is supplied to the filled area via pulp pipeline with the holes made in lower part, which is attached to the roof of mine working throughout its length. The holes made at the beginning of the pipeline are equipped with petal valves.
EFFECT: increases the filling degree of the worked-out area in hard-to-reach sections.
2 cl, 2 dwg
SUBSTANCE: invention is related to mining industry, namely to method for preparation of stowing mix. Tails of dressing works are sent to several stowing complexes with application of hydraulic transport system, comprising working and drain branches. Tails are separated in each stowing complex into condensed product sent for preparation of stowing mix and lightened discharge. Working and drain branches of hydraulic transport system are separated. Tails from working branch are sent to each stowing complex, and lightened discharge is drained to drain branch. End part of working branch and beginning of drain branch in hydraulic transport system are joined by emergency bridge comprising stop valves. Each stowing complex newly added to system of hydraulic transport is duplicated with emergency bridge. System of hydraulic transport includes several separated working and drain branches, which service groups of stowing complexes that vary in number. Working and drain branches of hydraulic transport system for sending of tails to several groups of stowing complexes may be combined into headers.
EFFECT: provision of stable high quality of mines stowing, increased efficiency and safety of mining works, lower costs for preparation of stowing mix and transportation of dressing works tails in servicing of several mines.
7 cl, 8 dwg, 1 ex
SUBSTANCE: invention refers to mining engineering and can be used during underground development of mineral deposits. Erection method of filling connection strap involves making of rock dike by laying as to width and height of the filling working of large rock pieces 1, on which there put is layer of finer rock or sand 2 with drain pipe 3 passed through rock dike. On rock dike there installed are pneumocylinders 4, which are forced outwards, between rock dike and roof of working by supplying to pneumocylinders 4 of compressed air with outward pressure which is more than limit value, at decrease of which pneumocylinders 4 are forced with backfill material 5 to the side of non-filled part of the working. Distance between rock dike and roof of working is determined by the ratio: amin<h<0.75amax, where: amin - minimum height of pneumocylinder 4 when in folded position till compressed air is supplied to it; h - distance between rock dike and roof of working; amax - size of pneumocylinder 4 after compressed air has been supplied to it.
EFFECT: increasing efficiency of filling operations.
1 cl, 1 dwg
SUBSTANCE: invention is related to mining industry, namely to hardening fill mixtures. It includes filler, liquid sodium glass, gypsum, cement. Fill mixture is additionally supplemented with flocculant and martite-hematite iron ore, with the following ratio of mixture components: liquid sodium glass 20-22%; cement 1-2%; gypsum 1-2%; flocculant 0.002-0.004%; martite-hematite iron ore 1%; filler - the rest.
EFFECT: improved quality of technological properties of hardening fill mixture, reduced prime cost, increased bearing capacity of filled mass, reduced consumption of hardening solution and simplified technology of stripped area filling.
2 cl, 1 tbl
SUBSTANCE: invention refers to mineral resource industry, namely to methods of protection of workings mainly at great depths and flat gradient of thick deposits in worked-out filling area and may be used during selective mining of thick deposits of highly valuable ore minerals. Method includes formation of secondary local zone of unloading by rock pressure in filling mass of worked-out area by means of balance bags and their filling with flexible material. Balance bags are performed during formation of filling mass in area of next working-out and as a flexible material layer of consolidating stowing is used which flexibility is enhanced as compared to the other layers.
EFFECT: improving of stability of workings formed in consolidating stowing mass.
7 cl, 4 dwg
SUBSTANCE: invention is related to the field of mining, namely, to travelling bulkheads for arrangement of filling mass in underground mine openings. It includes metal pressure shield, which consists of separate elements fixed to each other by means of bolts, soft shells, equipped with nozzles for supply and exhaust of compressed air, pipes for drainage with filters and pipes for sampling with plug. Metal pressure shield is arranged in the form of right-angled parallelepiped, which is made of four triangular fixed prisms, bases of which have the shape of isosceles right-angled triangle. Height of triangular prisms is accepted as higher than distance between roof of filled opening and metal pressure shield, in which door opening with door is installed, and door opens in direction of filling mass location. On upper and lateral sides of metal shield, there are soft shells arranged, height of which, when completely filled with compressed air, exceeds distance between metal pressure shield and contour of opening section. On the lower side metal pressure shield is equipped with rubberised apron on the side of filling mass.
EFFECT: invention makes it possible to increase efficiency and reliability of filling mass control in filling of lengthy mine openings and layer excavation of mineral.
SUBSTANCE: development method of lodes by layers with backfilling includes driving of preparatory-temporary workings 1, excavation of ore by diagonal layers 3, breaking by explosive blast holes into open area of layer, shipping of ore and filling of open area of layer by backfilling. Angle of slope of diagonal layer 3 is accepted equal to minimal limit angle, overcoming by self-propelled equipment. Backfilling is implemented up to designed taking-out capacity of lode by undermined rocks of bottom layer and/or granulated laying mixture from mill tailing.
EFFECT: effectiveness increase of development, cost cutting for development of lodes, losses of minerals and anthropogenic load to environment.
SUBSTANCE: invention is related to production of mineral raw materials in running of stable ores by heading-and-stall methods. Method for strengthening of filling mass includes supply of filling materials with various content of binders. Hydraulic filling of chamber with finely dispersed material without binders is carried out to elevation of drilling horizon soil. After water drainage and setting of filling mass the following are drilled in staggered order along chamber perimetre from the side of processed interchamber sight pillars: boreholes - in chamber ceiling and, opposite to them - wells for the whole capacity of filling mass. Anchors having ring in lower part are inserted in boreholes and wedged, and case pipes are lowered into wells, and then for the whole depth - armature rods, ends of which are suspended to chamber ceiling with anchor rings, afterwards wells and case pipes are filed with mortar, containing binder. Upper part of chamber up to ceiling is filled with filling mass without binder.
EFFECT: invention makes it possible to increase technological resources of stripped chambers filling and to reduce consumption of binder.
SUBSTANCE: invention is related to the field of mining and, in particular to underground development of ore deposits in cryolithic zone. In period of ambient air negative temperatures completely dehydrated tailings are briquetted and frozen on surface, then transported and placed in stripped area of stopes. And in period of ambient air positive temperatures tailings are partially dehydrated and supplied along pipes into stripped area of these stopes, which was before filled with frozen briquettes, for filling of interbriquette space with further freezing of created two-phase fillins mass due to natural negative temperature resource of enclosing strata and added negative ambient temperature resource of briquettes frozen on surface. Completeness of tailings location in stripped area created at stage of stoped excavation is provided by specified ratio of ore production volumes in period of negative and positive temperatures of ambient air. Using geothechnology with solid excavation of ore spreading without separation into stoped blocks, completeness of interbriquette space filling with pulp from tailings is provided by detection of distance between points of unloading into stripped area of frozen briquettes and pulp pouring from flowing tailings.
EFFECT: invention makes it possible to increase ecological safety of ore deposits development due to return of solid enrichment wastes into stripped area and their recycling by means of permafrost mass restoration in stripped area.
4 cl, 2 dwg
SUBSTANCE: method for development of steep layers by sublevel hydraulic breakage with associated outlet of shrunk coal from chambers of upper story, includes arrangement of sublevel drifts 5,6,7, drilling of wells 9,11, tillage of massif, coal extraction by hydraulic monitor 13. At first drilling machine 10 is installed in intermediate drift 6 fir drilling of wells 11, then coal tillage is carried out in chamber and shrunk. Then hydraulic monitor 13 from transport drift 7 is used to break lower story with associated outlet of shrunk coal 12 from chambers of upper story 15. In order to prevent rock bypass, above ventilation drift 5 and at the distance from each other depending on stability of side rocks along layer length, temporary under-blocking sight pillars 16, 17 are left in upper story 15.
EFFECT: invention makes it possible to provide for complex and rational usage of coal in subsoil, manless production of minerals, reduction of costs for preparation of extraction section stocks and improved efficiency of labour, reduced energy intensity of minerals breakage, efficient ventilation of bottomholes due to common shaft depression.
SUBSTANCE: method for integrated development of coal deposit area includes preliminary methane drainage of seams, opening-up and development of a mine by means of establishing a network of opening and developing mine workings with total inclination towards main shafts to arrange gravity-flowing water discharge, delivery of required amount of air to provide forced ventilation in one direction, coal cutting and transportation of broken-down coal to the surface along the said mine workings. While coal cutting works being developed, a part of mine workings in the mined-out area of mine field is being maintained until the end of mining thereof. Coal mining being finished, protective pillars, mining losses and substandard coal reserves are burned down under ground. After coal firing in the mine field, remnants of gaseous products are concentrated in the upper horizon of mine field by means of filling the entire worked-out space with water solution of reagents. Gaseous products of underground firing are trapped at the upper horizon of mine field and after extinguishing source of underground firing, productive solution is pumped out of shaft sump. Productive solution is directed to extraction of valuable and (or) toxic elements, multiple filling of the worked-out space with water solutions of reagents and pumping thereof being performed with change of reagent if necessary.
EFFECT: increased efficiency and environmental safety in development of coal deposit area.
SUBSTANCE: invention refers to mining industry, and namely to development method of steep coal bed. Method involves development of coal bed by using pre-bored wells and a hydraulic monitor with a head piece. First, cross drift is made from the slope in the direction of the superface or soil of the bed, then in the cross drift there installed is a boring machine for boring inclined wells of large and small diametre at one and the same level through certain length; after that in the well of small diametre there installed is bore-hole hydraulic monitor with the head piece rotating at 180°, and coal breakage is begun at the sub-level; at that, the well of large diametre, which is broken as the sub-level development proceeds, is used for transporting the broken mined rock to the slope.
EFFECT: complex and rational use of subsurface resources, manless mining operations, reducing costs for the bed preparation and increasing labour efficiency.
SUBSTANCE: method consists in preparing extraction pillar by driving transport and ventilation entries, in delineation of extracted stripe with coal chutes and air shafts along bed pitch line from transport to ventilation entry on both sides of stripe, in driving assembly chamber at ventilation entry, in constructing sections of powered roof support in assembly chamber, in mechanized mining of coal in step-like mining face in two layers, in forced transporting of coal along face and self-flowing transporting from upper layer to lower one and from step to step to transport entry, and in ventilating mining face by all-mine depression. Working space under each section of support is profiled with insignificant advanced mining of coal in the lower layer and with leaving temporary support massif at the support of the bed in the upper layer extracted before displacing sections of support at the final stage of extraction of the stripe of each section. The boundary of the upper layer is profiled along arc equal to radius of turn of a panel ceiling. An outlet opening is cut from working space of the lower layer of the extracted stripe to the transport entry limiting its height by the height of transport position of the support section. The section of the support is driven to a transport position, further it is removed to the transport entry through the outlet opening, and the outlet opening is backfilled with materials not subject to repeated utilisation.
EFFECT: increased efficiency and safety of development.
SUBSTANCE: invention refers to mining, particularly to development of steeply inclined coal beds of medium thickness with long pillars along strike, when pillars are extracted in strips along decline. The method of development between discontinuities consists in preparing an extraction pillar by driving transport and ventilation drifts, and in profiling mining strip between two mining-geological discontinuities with driving the pillar of coal shoot on a flank parallel to flank line of continuity fracture of coal containing massif; the pillar of coal shoot is equipped with a man way compartment; the ventilation drift is equipped with an assembling chamber, wherein sections of powered roof support are installed; the said sections are structurally connected with an actuator made in form of a projecting arm equipped with a horizontally installed worm cutting tool. The sections of the roof are connected between them with hydraulic jacks of support advancing and are put into operation successively, shaping banks in mining face; coal is cut first at the flank from the coal shoot and further to the ventilation drift. Mining of coal is performed alternately in all banks; broken coal is transported simultaneously-successively to coal shoot. Ventilation of the mining face is executed by all-mine depression. At final stages of strip mining, in worked out space of the strip there is constructed the second slope, the ventilation slope for facilitating ventilation of the mining face and arrangement of an escape way.
EFFECT: invention facilitates increasing efficiency of coal mining.
SUBSTANCE: invention relates to mining, particularly to the method of developing a thick flat coal bed, based on board-and-pillar mining system and comprising preparing the mine section in the layer nearby the seam roof by producing haulage and ventilation openings and extraction chambers from the haulage till ventilation opening in descending order. As the extraction chamber is produced nearby the said seam roof, a part of it is forepoled nearby seam floor by blasthole drilling into the upper layer floor, on both sides of extraction chamber, at the 20° to 30° angle to the chamber traverse cross section, and fixing thereat steel bolts, on the side of bed hanging wall, and polymer bolts, on the side of lying wall. On deepening the extraction chamber till the seam roof, its walls are held by roof bolting in producing extraction chamber nearby the roof to provide for higher safety in coal bed development.
EFFECT: higher safety in coal bed development.
SUBSTANCE: invention can be implemented for exposing and development of Elginskiy coal basin in Republic of Saha (Yakutia). The method of underground development consists in division of the basin into upper and lower beds, in driving pair galleries in the bed and in driving auxiliary pair of inclined excavations till the very upper bed in every elevation, also in using one branch of inclined excavations and galleries for transporting coal from the point of loading to a concentration plant. All beds of the basin are developed by an underground method successively in a descending order, for the purpose of which within the boundaries of bed attitude contour and for stoped excavation opening out of each bed is performed with long columns by means of mechanised complexes. The rest coal stores at exposures and those not excavated by long columns are worked out either by short wall face technology or by drilling coal out at bed exposures.
EFFECT: facilitating preservation ground surface at deposit area and eliminating hazardous effect to environment.
SUBSTANCE: invention refers to development of steeply inclined coal beds of medium thickness with long pillars along course of bed extracted by strips along pitch. The method is implemented between hitches and includes preparing an extraction pillar by leading transport (1) and ventilation (2) entries, contouring an extracting strip with coal (3) and ventilation chutes along the line of the bed pitch from the transport entry till ventilation entry on both sides of the strip; arranging assembly chamber 4 at ventilation entry 2, assembling therein sections 5 of a mechanised face support. Coal chute 3 is led on flank of the extraction pillar along the line of bed pitch from one side of the extracted strip. The first section 5 of the mechanised face support is assembled in the range of coal chute 3. Sections 5 of the mechanised face support are tied between them with thrusting jacks. At an initial stage of coal extraction a mining face is formed as a rise step entry; additional sections 5 of the face support are in turn assembled and put into operation. At a final stage the width of the extracted strip is limited and open area is separated from massif with a face support. A ventilation chute along the bed pitch from the counter side of the strip is arranged in its extracted space behind the last section 5 of the face support. Coal is extracted at each section 5 separately. Loose coal is transported along the mining face with transfer of transport flow from one extracting-transporting body to another using self-flow transporting from step to step.
EFFECT: increased efficiency of coal extraction.
SUBSTANCE: invention refers to mining and can be employed at underground development of high gas bearing coal beds. When pair development entries are developed bores of big diameter are drilled from one of them through coal massif with their successive bridging from the side of a conveyer entry of a developed pillar. Number N of boreholes drilled in each coal massif is determined from the expression confirming ensured integrity of carrying capacity of the coal massif. Maintaining the said section of the conveyer entry with a face support beyond a mining face is carried out along the not more, than ¼ length of the coal massif ensuring exhaust of methane-air mixture from the mining face. While developing the pillar, as the mining face advances, exhaust of the flow from a supported section of entry into a ventilation entry of subject to extraction pillar is performed in three stages at each section between ventilation props and withdrawal flow of methane-air mixture via the said section of the conveyer entry. Each borehole is preliminary bridged off at executing each stage of exhausting methane-air mixture. Also simultaneously with exhaust of methane-air mixture a gas-drainage chamber is arranged.
EFFECT: increased efficiency and safety of development due to reduction of costs for maintaining not-cleared beyond mining face conveyer entry and due to improved mode of mining face ventilation.
2 cl, 5 dwg
SUBSTANCE: method of mine working can be implemented at developing of mildly sloping or inclined shallow and medium coal beds. The said method includes development of mining level by means of transport and ventilation driving with unloading platforms on both sides of a drift. Perpendicularly to the drift there are made stables which are transformed into unloading platforms by means of boring of unloading boreholes advancing the drift; the said unloading boreholes are separated between themselves with virgin coal. Further entry driving is carried out up to the end of unloading boreholes in massif, free from the influence of underground pressure with unloading platforms. At that rock from drift top breaking is piled into the unloading boreholes, after what an operation cycle is repeated.
EFFECT: reduction of coal losses in massifs, reduced dilution of coal with rocks caused by driving and repair of drifts, acceleration of preparing and completion of mining level, additional production out of boreholes, and providing repeated and excluding repair usage of development excavations.
FIELD: mining industry.
SUBSTANCE: method includes driving of layer transporting and ventilation mines along soil and ceiling of bed, in massive and in extracted space, cutting of cleaning mines in cross-section of bed at angle of 27°, mechanized delivery of coal along bed mines to coal furnaces and vertical dropping of coal to furnaces. Extraction of slanted transverse bed is performed along bed diagonals having direction to horizon at angle of 27°, to provide for free sliding of coal without degradation. Delivery of coal from cleaning mine placed at angle of 60° to layer mine, to back field mine is performed by self-delivery from any place of extraction field along layer mine, field coal-lowering mine and field slanting coal furnace, being at angle of 27° to horizon. Field slanted coal furnaces are placed at distance from one another along 20 m normal. Field coal mines in form of fans of three mines are connected on field slanted coal furnaces at distance of fan start from one another of 60 m with output of mines ends to each layer mine of group of three above-lying slanted-transverse layers for whole diagonal length of extraction field at distance between mines outputs along layer soil of 60 m. Ceiling of cleaning mines may be supported without load, utilizing mechanical traction on the side of ventilation furnaces for pressing moveable support tool to layer ceiling.
EFFECT: higher efficiency.
2 cl, 3 dwg