CN114412543B - Gas control method for first-produced coal seam of close-range outburst coal seam group - Google Patents
Gas control method for first-produced coal seam of close-range outburst coal seam group Download PDFInfo
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- CN114412543B CN114412543B CN202111636680.2A CN202111636680A CN114412543B CN 114412543 B CN114412543 B CN 114412543B CN 202111636680 A CN202111636680 A CN 202111636680A CN 114412543 B CN114412543 B CN 114412543B
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- 239000003245 coal Substances 0.000 title claims abstract description 175
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000005065 mining Methods 0.000 claims abstract description 44
- 238000005553 drilling Methods 0.000 claims abstract description 20
- 239000002390 adhesive tape Substances 0.000 claims abstract description 17
- 230000005641 tunneling Effects 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 69
- 238000000605 extraction Methods 0.000 claims description 33
- 239000011229 interlayer Substances 0.000 claims description 15
- 238000009412 basement excavation Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005086 pumping Methods 0.000 description 13
- 238000010276 construction Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 8
- 238000009423 ventilation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000003818 cinder Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The embodiment of the invention provides a gas control method for a first-produced coal seam of a close-range outburst coal seam group, which comprises the following specific steps: s1, digging a high-suction roadway in and out of a fracture zone area above a working surface to be mined, which is adjacent to the mined working surface; s2, digging a track cis-slot and a cutting hole corresponding to the working surface to be mined on the working surface to be mined, wherein the original track cis-slot is reserved in a gob-side entry retaining mode and is used as an adhesive tape cis-slot of the working surface to be mined, and a first mining cis-layer drilling hole is arranged in the working surface to be mined; s3, tunneling a bottom drainage roadway in the lower adjacent coal seam, and arranging bottom drainage roadway drilling holes communicated with a drainage pipeline of the bottom drainage roadway in the lower adjacent coal seam, wherein the bottom drainage roadway can be used as a track roadway and/or a tape roadway of the lower adjacent coal seam; s4, repeating the steps S1 to S3 until the mining of the first coal mining layer is finished. Therefore, the gas control method for the first-produced coal seam of the close-range outburst coal seam group has the advantages of reducing the production cost and improving the safety and the production efficiency.
Description
Technical Field
The invention relates to the technical field of gas control, in particular to a gas control method for a first-produced coal seam of a close-range outburst coal seam group.
Background
Regional outburst prevention measures are required before mining coal beds (outburst coal beds) where coal and gas are at risk. The common area outburst prevention measures comprise two types of mining protection layers and pre-extraction of coal seam gas, and the first mining layer of the close-range outburst coal seam group is the protection layer, so that the pre-extraction of coal seam gas is mainly adopted for the mining of the first mining layer.
In the related art, the gas control of the working face is mainly constructed by arranging a rock high drainage roadway or a bottom drainage roadway. However, each working face needs to be constructed with one or two rock bottom-pumping lanes and high-pumping lanes (the bottom-pumping lanes and the high-pumping lanes for the outburst coal seam group are arranged in the rock), and the rock lanes have the problems of high construction cost, long period, no reusability and the like, so that the mining connection of the working faces in the mine is seriously affected.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a gas control method for a first-produced coal seam of a close-range outburst coal seam group. The gas control method for the first-mined coal seam of the close-range outburst coal seam group has the advantages of reducing mining cost and improving safety and mining efficiency; and simultaneously, the concentration of the upper corner and the return air flow gas can be reduced.
The method for controlling gas of the first coal seam of the close-range outburst coal seam group comprises a first coal seam, a lower adjacent coal seam and an interlayer positioned between the first coal seam and the lower adjacent coal seam, wherein the first coal seam is provided with a mined working surface and an original track gateway corresponding to the mined working surface. The short-distance coal seam group is a coal seam group which is provided with at least two layers of coal seams, and the distance between two adjacent coal seams is 10m-20 m; the protruding coal seam is a coal seam with coal and gas protruding property.
The gas control method of the first-coal seam comprises the following steps:
S1, digging a high-extraction roadway in and out of a fracture zone area above a working surface to be mined, which is adjacent to a mined working surface, and arranging a layer-penetrating pre-extraction drilling hole downwards from the high-extraction roadway;
S2, digging a track gateway and a cutting hole corresponding to the working surface to be mined in and out of the working surface to be mined, wherein the original track gateway is reserved in a gob-side entry retaining mode and is used as an adhesive tape gateway of the working surface to be mined, and a first mining gateway layer drilling hole is arranged in the working surface to be mined so as to form a gas extraction system communicated with an extraction pipeline corresponding to the working surface to be mined;
S3, after tunneling of the working face to be mined is finished, tunneling a bottom drainage roadway on the lower adjacent coal bed, wherein the bottom drainage roadway is located in a pressure relief area corresponding to the working face to be mined, a bottom drainage layer drainage hole communicated with a drainage pipeline of the bottom drainage roadway is arranged in the lower adjacent coal bed, and the bottom drainage roadway can be used as a track gateway and/or an adhesive tape gateway of the lower adjacent coal bed;
S4, repeating the steps S1 to S3 until the mining of the first coal mining layer is finished.
According to the gas control method for the first-coal-seam of the close-range outburst coal seam group, the original track cis-slot is used as the adhesive tape cis-slot of the working face to be mined, in the tunneling process, the working face to be mined only needs to be dug into and out of the track cis-slot and the cutting hole corresponding to the working face to be mined, and a new adhesive tape cis-slot does not need to be dug out again, so that the construction of adhesive tape cis-slot tunneling of the first-coal-seam is reduced, the construction efficiency is improved, and the construction cost is reduced. In addition, the tunneling time of the single-head roadway (namely the total time of tunneling the track gate way, the cutting hole and the adhesive tape gate way) is reduced, so that a ventilation system (gas extraction system) of a working face to be extracted is formed in time, and the extraction safety is improved.
According to the gas control method for the first-coal-seam of the close-range outburst coal seam group, the bottom drainage roadway and the bottom drainage bedding drainage holes are tunneled in the lower adjacent coal seam, and the gas of the lower adjacent coal seam is pre-drained in advance through the bottom drainage roadway and the bottom drainage bedding drainage holes, so that the safety of mining of the working face of the first-coal seam and the lower adjacent coal seam is improved. In addition, the bottom drainage roadway can be used as a gateway of an adjacent coal seam under later mining, when the adjacent coal seam is mined, the track gateway and/or the adhesive tape gateway are preset in advance, and then the ventilation system of the mining working face can be formed after the corresponding cutting hole of the mining working face is tunneled, so that the tunnelling time of the single-head roadway is reduced, and the mining safety is improved. In addition, when the first-mining coal bed is mined, the bottom-mining bedding pumping holes can timely pump out gas near the pre-pumping holes of the lower adjacent coal beds; after the first coal seam is mined, the interlayer can be subjected to large-area pressure relief and permeability improvement, and the bottom mining bedding drainage holes can be used for intercepting gas in the lower adjacent coal seam to upwards surge to a mining area of the first coal seam through the interlayer, so that the collection and the treatment of the gas are facilitated.
According to the gas control method for the first coal seam of the close-range outburst coal seam group, disclosed by the embodiment of the invention, the high drainage roadway, the track gateway, the adhesive tape gateway and the bottom drainage roadway are formed on the working surface to be mined to form a one-side four-roadway arrangement mode, and the through-layer pre-drainage drilling, the hole cutting, the first drainage gateway and the bottom drainage gateway are combined to form a gas discharge (drainage) passage.
Therefore, the gas control method for the first-produced coal seam of the close-range outburst coal seam group has the advantages of reducing the production cost and improving the safety and the production efficiency; meanwhile, the concentration of the upper corner and the return air flow gas is reduced, and the problem of overrun of the upper corner and the return air flow gas can be solved.
In some embodiments, in step S1, the high-speed roadway and the original track gateway are driven in parallel, and a distance between a bottom wall of the high-speed roadway and the first coal seam is unchanged.
In some embodiments, the distance between the high-speed roadway and the working surface to be mined is 8-12 times the mining height of the first-mining coal bed.
In some embodiments, in step S1, a plurality of through-layer pre-pumping holes are arranged downward from the high pumping roadway, the plurality of through-layer pre-pumping holes extend obliquely downward, and a lower end of each through-layer pre-pumping hole extends to the interlayer.
In some embodiments, each of the through-layer pre-pump holes extends a length of 1m-2m in a portion of the interlayer.
In some embodiments, in step S2, a region having or adjacent to the through-layer pre-extraction borehole is drilled into and out of a track gate and cut corresponding to the face to be mined.
In some embodiments, the track gate is driven adjacent to the high-speed roadway as compared to the tape gate.
In some embodiments, at least a portion of the plurality of through-layer pre-extraction holes are located at a minimum distance of 15m or more from each of the orbital slot and the cut hole at a section of the face to be mined.
In some embodiments, in step S2, a plurality of the first-mining-layer bores are arranged in a region of the face to be mined between the track gate and the tape gate, each of the plurality of first-mining-layer bores extending in the direction of the cut.
In some embodiments, at least one of the first adopts the layer drilling and extends from the track cis trough to the direction of the tape cis trough, and at least another of the first adopts the layer drilling and extends from the tape cis trough to the direction of the track cis trough.
In some embodiments, the length of at least one of the first-mining-bedding boreholes and the length of at least one other of the first-mining-bedding boreholes have a region of coincidence in the direction of the heading of the face to be mined.
In some embodiments, the overlap region has a length of at least 10m.
In some embodiments, in the step S3, the extending direction of the bottom-casing string is parallel to the mining direction along the mined face to the face to be mined.
Drawings
FIG. 1 is a mining layout of a first-mined coal seam of a close-up outburst coal seam group in accordance with one embodiment of the invention.
Fig. 2 is a borehole arrangement for a first-produced coal seam of a close-proximity outburst coal seam group in accordance with an embodiment of the invention.
Fig. 3 is a cross-sectional view of one of the roadway arrangements of the first-seam coal of the close-range protruding coal seam group in accordance with an embodiment of the present invention.
Fig. 4 is a further cross-sectional view of a roadway layout for a first-seam coal seam of a close-proximity outburst coal seam group in accordance with an embodiment of the invention.
Fig. 5 is a schematic diagram of a process of a method for controlling gas in a first-rank coal seam of a close-seam outburst coal seam group according to an embodiment of the invention.
Fig. 6 is a second schematic process diagram of a method for controlling gas in a first-seam coal seam of a close-range outburst coal seam group according to an embodiment of the invention.
Fig. 7 is a schematic diagram of a process of a method for controlling gas in a first-rank coal seam of a close-seam outburst coal seam group according to an embodiment of the invention.
Fig. 8 is a process diagram of a method for controlling gas in a first-rank coal seam of a close-seam outburst coal seam group according to an embodiment of the invention.
Reference numerals:
A first coal seam 100;
an original track gate 11; a mined work surface 12; a working surface 13 to be mined; a track gate 131; a cut 132; tape gate 133; a first-fracture borehole 134; a first production borehole 1341, a second production borehole 1342;
A lower adjacent coal seam 200;
a bottom suction roadway 21; bottom-mining-in-layer pump-out bore 22;
A high extraction lane 300; a through-layer pre-pump borehole 400;
interlayer 400.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The gas control method of the first-produced coal seam of the close-range outburst coal seam group according to the embodiment of the invention is described below with reference to fig. 1 to 8.
The close-range outburst coal seam group comprises a first coal seam 100, a lower adjacent coal seam 200 and an interlayer 400 positioned between the first coal seam 100 and the lower adjacent coal seam 200, wherein the first coal seam 100 is provided with a mined working surface 12 and an original track gateway 11 corresponding to the mined working surface 12. The short distance coal seam group is a coal seam group formed by two or more coal seams and having a distance between two adjacent coal seams of 10m to 20 m; the protruding coal seam is a coal seam with coal and gas protruding property.
The gas control steps of the first-produced coal seam of the close-range outburst coal seam group in the embodiment of the invention are as follows:
s1 digs into and out of the highways 300 in the upper fracture zone region of the face 13 to be mined adjacent to the mined face 12, and a through-layer pre-extraction borehole 400 is arranged downwardly from the highways 300, as shown for example in fig. 3 to 5.
S2, digging a track gateway 131 and a cutting hole 132 corresponding to the working surface 13 to be mined on the working surface 13 to be mined, wherein the original track gateway 11 is left in a gob-side entry retaining mode and serves as a tape gateway 133 of the working surface 13 to be mined, and corresponding first mining gateway drill holes 134 are arranged in the working surface 13 to be mined so as to form a gas discharge (extraction) passage communicated with a pressure relief area corresponding to the working surface 13 to be mined, for example, as shown in fig. 4 and 6.
S3, after the excavation of the working face 13 to be exploited is finished, the bottom drainage roadway 21 is excavated in the lower adjacent coal bed 200, the bottom drainage roadway 21 is located in a pressure relief area corresponding to the working face 13 to be exploited after the excavation is finished, bottom drainage layer drainage holes 22 communicated with the drainage pipelines of the bottom drainage roadway 21 are arranged in the lower adjacent coal bed 200, and the bottom drainage roadway 21 can be used as a track gateway 131 and/or a tape gateway 133 of the lower adjacent coal bed 200, for example, as shown in fig. 7 and 8. It will be appreciated that when the lower adjacent coal seam 200 is mined, the lower adjacent coal seam 200 has N faces to be mined for different faces of the lower adjacent coal seam 200, and the tape and track grooves for one of the faces to be mined of the lower adjacent coal seam 200 are all bottom draw grooves in the lower adjacent coal seam 200.
For example, the mth bottom drainage roadway and the (m+1) bottom drainage roadway of the lower adjacent coal seam 200 are two corresponding grooves of the mth mining surface. The M+1st working surface to be mined of the lower adjacent coal seam 200 is respectively an M+1st bottom drainage lane and an M+2nd bottom drainage lane which are respectively corresponding two parallel grooves of the M+1st working surface to be mined, and the like, wherein M is an integer.
And S4, repeating the steps S1 to S3 until the mining of the first-mining coal seam 100 is finished.
In the gas control method for the first-coal seam of the close-range outburst coal seam group, the original track gateway 11 is used as the adhesive tape gateway 133 corresponding to the working surface 13 to be mined, in the tunneling process, the working surface 13 to be mined only needs to be dug into and out of the track gateway 131 and the cutting hole 132 corresponding to the working surface 13 to be mined, no new adhesive tape gateway 133 is required to be tunneling again, the construction of tunneling the corresponding adhesive tape gateway 133 (the adhesive tape gateway 133 and the track gateway 13S 1) of the first-coal seam 100 is reduced, the construction efficiency is improved, and the construction cost is reduced.
According to the gas control method for the first-produced coal seam of the close-range outburst coal seam group, the bottom drainage roadway 21 and the bottom-produced bedding drainage holes 22 are tunneled in the lower adjacent coal seam 200, and gas in the lower adjacent coal seam 200 is pre-drained in advance through the bottom drainage roadway 21 and the bottom-produced bedding drainage holes 22, so that safety of the lower adjacent coal seam 200 is improved. In addition, the bottom drainage roadway 21 can be used as a gateway of the next-to-seam coal seam 200 under the later mining, when the next-to-seam coal seam 200 is mined, the track gateway 131 and/or the tape gateway 133 are preset in advance, and then the corresponding ventilation system of the mining working face can be formed after the corresponding cutting hole 132 of the corresponding mining working face is tunneled, so that the tunnelling time of the single-head roadway is reduced, and the mining safety is improved. In addition, when the first-mining coal seam 100 is mined, the bottom-mining bedding drainage holes 22 serve as pre-drainage holes of the lower adjacent coal seam 200 to timely drain gas in the lower adjacent coal seam 200; in the exploitation process of the first coal seam 100, the interlayer 400 can have large-area pressure relief and permeability improvement, and the bottom-seam drainage hole 22 can enable gas near the bottom-seam drainage hole 22 to be released to the bottom drainage roadway through the bottom-seam drainage hole 22, so that gas in the lower adjacent coal seam 200 corresponding to the bottom-seam drainage hole 22 is inhibited from upwelling to the mining area of the first coal seam 100, and the collection and the treatment of the gas are facilitated.
The gas control method for the first coal seam of the close-range outburst coal seam group in the embodiment of the invention forms the high drainage roadway 300, the track gateway 131 and the adhesive tape gateway 133 corresponding to the working surface to be mined above the working surface 13 to be mined, forms a one-side four-roadway arrangement mode on the bottom drainage roadway 21 corresponding to the lower adjacent coal seam 200, and combines the through-layer pre-drainage drilling 400, the cut hole 132, the first drainage gateway 134 and the bottom drainage gateway 22 to form a gas discharge (drainage) passage.
Therefore, the gas control method for the first-produced coal seam of the close-range outburst coal seam group has the advantages of reducing the production cost and improving the safety and the production efficiency; meanwhile, the gas concentration of the upper corner and the return air flow is reduced, and the gas control effect is good.
In step S1, when the high-speed roadway 300 is driven, the high-speed roadway 300 is driven in parallel with the original track gateway 11, and the distance between the bottom wall of the high-speed roadway 300 and the first coal seam 100 is unchanged.
According to the embodiment of the invention, the short-distance protruding coal seam group first coal seam is tunneled in parallel with the original track gateway 11 through the high drainage roadway 300, the distance between the bottom wall of the high drainage roadway 300 and the first coal seam 100 is unchanged, and the relative stability of the size and the angle of the through-layer pre-drainage drillings 400 at the same height position is facilitated when the through-layer pre-drainage drillings 400 are arranged along the length direction of the high drainage roadway 300.
Optionally, the high-rise roadway 300 is spaced from the face 13 to be mined by 8-12 times the mining height of the first-mined coal seam. The tunneling length of the through-layer pre-pumping drilling hole 400 can be shortened, and the construction efficiency of the through-layer pre-pumping drilling hole 400 is improved.
In step S1, a plurality of through-layer pre-pump holes 400 are arranged downward from the high-pump lane 300, the plurality of through-layer pre-pump holes 400 extend obliquely downward, and a lower end of each through-layer pre-pump hole 400 extends to the interlayer 400. At this time, the gas in the working surface 13 to be mined and the pressure relief area corresponding to the working surface 13 to be mined is released into the high-drainage roadway 300 through the through-layer pre-drainage drill 400, and is further drained in time.
According to the gas control method for the first-produced coal seam of the close-range outburst coal seam group, the plurality of through-layer pre-extraction holes 400 are arranged, the plurality of through-layer pre-extraction holes 400 extend obliquely downwards, the range of gas drainage through the through-layer pre-extraction holes 400 is widened, and the gas drainage effect can be further improved.
Optionally, each through-layer pre-pump hole 400 extends a length of 1m-2m in the portion of the interlayer 400. Since some of the cinder and residual water are not drained during the start of the through-layer pre-pump hole 400, they are deposited in the region of the lower end of the through-layer pre-pump hole 400. According to the gas control method for the first-produced coal seam of the close-range outburst coal seam group, disclosed by the embodiment of the invention, the length of the part of the through-layer pre-extraction hole 400 extending into the interlayer 400 is 1-2 m, so that coal slag and residual water are accumulated in the interlayer 400, the through-layer pre-extraction hole 400 is communicated with the part above the interlayer 400, and the gas drainage effect of the through-layer pre-extraction hole 400 is improved.
In step S2, a track groove 131 and a cut 132 corresponding to the face 13 to be mined are dug in and out in the face 13 to be mined having the through-layer pre-suction hole 400 or in the region adjacent to the through-layer pre-suction hole 400. In other words, the position of the corresponding track gate 131 of the face 13 to be mined is determined according to the position of the lower end of the through-layer pre-pump hole 400.
According to the gas control method for the first-coal-seam of the close-range outburst coal seam group, the through-layer pre-extraction drill holes 400 are used for pre-extracting gas in advance in the area corresponding to the working face 13 to be extracted, then the working face 13 to be extracted is excavated into and out of the track gateway 131, upper corners and air return flow gas overrun are prevented, and accordingly safety in the tunneling process is improved.
The track gate 131 is tunneled adjacent to the high-speed roadway 300 as compared to the tape gate 133.
According to the gas control method for the first coal seam of the close-range outburst coal seam group, the track gateway 131 is driven to be adjacent to the high-drainage roadway 300, so that the length of the through-layer pre-drainage drilling 400 (one end of the through-layer pre-drainage drilling 400 is communicated with the high-drainage roadway 300, and the other end of the through-layer pre-drainage drilling 400 is communicated with the track gateway 131 or is arranged close to the track gateway 131) can be shortened, and the construction efficiency and cost of the through-layer pre-drainage drilling 400 are improved.
At least a portion of the plurality of through-layer pre-pump holes 400 are located at a minimum distance of 15m or more from each of the rail gate 131 and the cut 132 at a section of the face 13 to be mined. That is, at least a portion of the plurality of through-layer pre-pump holes 400 is located at a minimum distance of 15m or more from the track gate 131 of the face 13 to be mined, and at least a portion of the plurality of through-layer pre-pump holes 400 is located at a minimum distance of 15m or more from the cut 132 of the face 13 to be mined.
According to the gas control method for the first-coal-seam of the close-range outburst coal seam group, the lower end of the partial through-layer pre-pumping hole 400 is extended outwards to the area, close to or communicated with the track gateway 131, of the working face 13 to be mined, the range of a pressure relief area is increased, the pressure relief effect is further improved, and the mining safety is further improved.
Specifically, one end of the plurality of through-layer pre-extraction holes 400 is communicated with the high extraction roadway 300, and the other end of a part of the through-layer pre-extraction holes 400 extends to an area of the working surface 13 to be extracted, which is close to or communicated with the track gateway 131, in a flaring manner.
In step S2, a plurality of first-mining-layer bores 134 are arranged in the region of the face 13 to be mined between the track gate 131 and the tape gate 133, each of the plurality of first-mining-layer bores 134 extending along the length of the cut 132.
The gas control method for the first-seam coal seam of the close-range outburst coal seam group in the embodiment of the invention can promote gas extraction in the working face 13 to be extracted through the plurality of first-seam drilling holes 134, specifically, the gas in the working face 13 to be extracted overflows into the first-seam drilling holes 134 and is extracted through at least one of the adhesive tape slot 133, the cutting hole 132 and the track slot 131 of the working face 13 to be extracted. In order to increase the air exhausting capability of the ventilation channel formed by the tape guide 133, the cut 132 and the rail guide 131 of the working face 13 to be mined, the ventilation channel can be ensured to be in a negative pressure state.
As shown in fig. 2, at least one first breaker borehole 134 extends from the track gate 131 in the direction of the tape gate 133 and at least one other first breaker borehole 134 extends from the tape gate 133 in the direction of the track gate 131. In other words, the first casing borehole 134 may be bi-directionally perforated. Thereby increasing the efficiency of the first-mining-bedding borehole 134 and reducing the difficulty of construction of the first-mining-bedding borehole 134.
For example, the first production borehole 134 extending from the track gate 131 to the tape gate 133 is defined as a first production borehole 1341, the first production borehole 134 extending from the tape gate 133 to the track gate 131 is defined as a second production borehole 1342, and the first production borehole 1341 and the second production borehole 1342 are disposed at intervals.
Optionally, the length of at least one first-seam borehole 134 and the length of at least one other first-seam borehole 134 have overlapping regions in the direction of the heading of the coal seam. In other words, the first and second first production bores 1341, 1342 have overlapping areas in the direction of the excavation of the face 13 to be mined. The gas release speed is improved, and the gas control speed of the close-range outburst coal seam group can be improved.
Optionally, the length of the overlap region is at least 10m.
In step S3, the bottom-seam pump-out hole 22 extends in a direction parallel to the production direction along the produced face 12 to the face 13 to be produced.
Optionally, the bottom-mining-bedding pump-out hole 22 is arranged in the lower adjacent coal seam 200 along the upward or downward extending direction of the lower adjacent coal seam 200, which has the advantage of convenient construction.
Optionally, the bottom-casing borehole 22 and the cut 132 or the first-casing borehole 134 are disposed parallel to each other. At this time, under the condition that the length of the bottom-mining-order layer drainage borehole 22 is fixed, the effective distance of the bottom-mining-order layer drainage borehole 22 along the extending direction of the lower adjacent coal seam 200 is the largest, and the construction efficiency of the bottom-mining-order layer drainage borehole 22 is improved.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The gas control method for the first-coal-seam of the close-range outburst coal seam group is characterized in that the close-range outburst coal seam group comprises a first-coal-seam, a lower adjacent coal seam and an interlayer positioned between the first-coal-seam and the lower adjacent coal seam, and the first-coal-seam is provided with a mined working surface and an original track gateway corresponding to the mined working surface; the gas control method comprises the following steps:
S1, digging a high-extraction roadway in and out of a fracture zone area above a working surface to be mined, which is adjacent to a mined working surface, and arranging a layer-penetrating pre-extraction drilling hole downwards from the high-extraction roadway;
s2, digging a track cis-slot and a cutting hole corresponding to the working surface to be mined on the working surface to be mined, wherein the original track cis-slot is reserved in a gob-side entry retaining mode and is used as an adhesive tape cis-slot of the working surface to be mined, and a first mining cis-layer drilling hole is arranged in the working surface to be mined so as to form a gas extraction system communicated with an extraction pipeline corresponding to the working surface to be mined;
S3, after tunneling of the working face to be mined is finished, tunneling a bottom drainage roadway on the lower adjacent coal bed, wherein the bottom drainage roadway is located in a pressure relief area corresponding to the working face to be mined, a bottom drainage layer drainage hole communicated with a drainage pipeline of the bottom drainage roadway is arranged in the lower adjacent coal bed, and the bottom drainage roadway can be used as a track gateway and/or an adhesive tape gateway of the lower adjacent coal bed;
S4, repeating the steps S1 to S3 until the mining of the first coal mining layer is finished.
2. The gas control method for the first-cut coal seam of the close-range outburst coal seam group according to claim 1, wherein in the step S1, the high drainage roadway and the original track gateway are driven in parallel, and the distance between the bottom wall of the high drainage roadway and the first-cut coal seam is unchanged.
3. The method for controlling gas in a first-rank coal seam of a close-range outburst coal seam group according to claim 1, wherein in step S1, a plurality of through-layer pre-drainage holes are arranged downwards from the high drainage roadway, the plurality of through-layer pre-drainage holes extend obliquely downwards, and the lower end of each through-layer pre-drainage hole extends to the interlayer.
4. The method for controlling gas in a first-coal seam of a close-range protruding coal seam group according to claim 1, wherein in step S2, a region having the through-layer pre-extraction hole or adjacent to the through-layer pre-extraction hole on the working surface to be mined is dug in and out of a track gate and a cut corresponding to the working surface to be mined.
5. The method for controlling gas in a first-seam coal seam of a close-range outburst coal seam group according to claim 4, wherein the track gateway is tunneled adjacent to the high-drainage roadway compared to the tape gateway.
6. The method for gas control of a short-distance outburst coal seam group first-cut coal seam according to claim 1, wherein a minimum distance between a section of the face to be mined, at least a part of the plurality of through-layer pre-extraction holes, and each of the track gateway and the cut holes is 15m or more.
7. A method of controlling gas in a first-seam coal seam of a close-seam-protrusion group according to claim 1, wherein in step S2, a plurality of first-seam boreholes, each of which extends in the direction of the cut, are arranged in a region of the working surface to be mined between the track gateway and the tape gateway.
8. A method of controlling gas in a first seam of a close-protrusion coal seam group as claimed in claim 7, wherein at least one of the first seam boreholes extends from the track gateway in the direction of the tape gateway and at least one other of the first seam boreholes extends from the tape gateway in the direction of the track gateway.
9. The method for gas control of a first-seam coal seam of a close-range outburst coal seam group according to claim 8, wherein the length of at least one of the first-seam boreholes and the length of at least one other of the first-seam boreholes have a coincidence region in the direction of the excavation of the face to be mined.
10. A method of controlling gas in a first seam of a close-proximity outburst coal seam group according to any one of claims 1 to 9, wherein in step S3 the bottom-seam drainage bore hole extends in a direction parallel to the mining direction along the mined face to the face to be mined.
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