CN114412543A - Gas control method for first coal seam of close-distance outburst coal seam group - Google Patents
Gas control method for first coal seam of close-distance outburst coal seam group Download PDFInfo
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- CN114412543A CN114412543A CN202111636680.2A CN202111636680A CN114412543A CN 114412543 A CN114412543 A CN 114412543A CN 202111636680 A CN202111636680 A CN 202111636680A CN 114412543 A CN114412543 A CN 114412543A
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- 239000003245 coal Substances 0.000 title claims abstract description 189
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000005065 mining Methods 0.000 claims abstract description 84
- 238000000605 extraction Methods 0.000 claims description 41
- 239000010410 layer Substances 0.000 claims description 34
- 238000005086 pumping Methods 0.000 claims description 27
- 239000011229 interlayer Substances 0.000 claims description 15
- 238000009412 basement excavation Methods 0.000 claims description 8
- 238000005553 drilling Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000002390 adhesive tape Substances 0.000 description 16
- 238000010276 construction Methods 0.000 description 14
- 230000005641 tunneling Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000009423 ventilation Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 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
- 239000011241 protective layer Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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Abstract
The embodiment of the invention provides a gas control method for a first coal seam of a short-distance outburst coal seam group, which comprises the following specific steps: s1 digging in and out of a high-suction roadway at an upper fissure zone area of a to-be-mined working face adjacent to the mined working face; s2, digging a track gate way and a cutting hole corresponding to the working face to be mined in and out of the working face to be mined, wherein the original track gate way is reserved in a gob-side entry retaining mode and is used as a rubber belt gate way of the working face to be mined, and a first mining gate-way drilling hole is arranged in the working face to be mined; s3, excavating a bottom suction roadway in the lower adjacent coal seam, and arranging a bottom suction bedding suction hole communicated with a suction pipeline of the bottom suction roadway in the lower adjacent coal seam, wherein the bottom suction roadway can be used as a track gateway and/or a rubber belt gateway of the lower adjacent coal seam; s4 repeating steps S1-S3 until the first coal seam mining is finished. Therefore, the gas control method for the first coal seam of the short-distance outburst coal seam group has the advantages of reducing the mining cost and improving the safety and the mining efficiency.
Description
Technical Field
The invention relates to the technical field of gas control, in particular to a gas control method for a first coal seam of a short-distance outburst coal seam group.
Background
Regional outburst prevention measures are required before mining of coal and gas outburst dangerous coal seams (outburst coal seams). The common regional outburst prevention measures comprise two types of mining protective layers and pre-pumping coal seam gas, and the first mining layer of the short-distance outburst coal seam group is the protective layer, so that the pre-pumping coal seam gas mode is mainly adopted for mining the first mining coal seam.
In the related technology, the gas control of the current mining working face is mainly constructed by arranging a rock high-suction roadway or a bottom-suction roadway. However, each working face needs to be constructed with one or two rock bottom pumping roadways and high pumping roadways (the bottom pumping roadway and the high pumping roadway protruding out of the coal seam group are arranged in the rock), and the rock roadways have the problems of high construction cost, long period, non-reusability and the like, and the mining connection of the working faces in the mine is seriously influenced.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides a gas control method for a first coal seam of a close-distance outburst coal seam group. The gas control method for the first coal seam of the close-range outburst coal seam group has the advantages of reducing the mining cost and improving the safety and the mining efficiency; and simultaneously, the concentration of the gas at the upper corner and the return air flow can be reduced.
The gas control method for the first-mined coal seam of the short-distance outburst coal seam group comprises a first-mined coal seam, a lower adjacent coal seam and an interlayer positioned between the first-mined coal seam and the lower adjacent coal seam, wherein the first-mined coal seam is provided with a mined working face and an original track crossheading corresponding to the mined working face. The close-distance coal seam group is a coal seam group which at least has two coal seams, and the distance between two adjacent coal seams is 10-20 m; the outburst coal seam refers to a coal seam with coal and gas outburst.
The method for preventing and controlling the gas of the first mining coal seam comprises the following steps:
s1, excavating in and out a high-suction roadway at an upper fractured zone area of a to-be-mined working face adjacent to the mined working face, and arranging a layer-penetrating pre-suction drill hole downwards from the high-suction roadway;
s2, digging a track gate way and a cutting hole corresponding to the working face to be mined in and out of the working face to be mined, wherein the original track gate way is reserved in a gob-side entry retaining mode and is used as a rubber belt gate way of the working face to be mined, and a first mining gate way drilled hole is arranged in the working face to be mined so as to form a gas extraction system communicated with an extraction pipeline corresponding to the working face to be mined;
s3, after the excavation of the working face to be exploited is finished, excavating a bottom suction tunnel in the lower adjacent coal seam, wherein the bottom suction tunnel is positioned in a pressure relief area corresponding to the working face to be exploited after the excavation is finished, and a bottom exploitation bedding suction hole communicated with an extraction pipeline of the bottom suction tunnel is arranged in the lower adjacent coal seam, wherein the bottom suction tunnel can be used as a track gateway and/or a rubber belt gateway of the lower adjacent coal seam;
s4 repeating steps S1-S3 until the first coal seam mining is finished.
According to the gas control method for the first-mined coal seam of the short-distance outburst coal seam group, the original track crossheading is used as the adhesive tape crossheading of the working face to be mined, in the tunneling process, only the track crossheading and the cutting hole corresponding to the working face to be mined need to be tunneled in and out of the working face to be mined, a new adhesive tape crossheading does not need to be tunneled again, the construction of adhesive tape crossheading tunneling of the first-mined coal seam is reduced, the construction efficiency is improved, and the construction cost is reduced. In addition, the tunneling time of a single-ended roadway (namely the total time for tunneling the track crossheading, the cutting hole and the adhesive tape crossheading) is reduced), so that a ventilation system (a gas extraction system) of a working face to be mined is formed in time, and the mining safety is improved.
According to the gas control method for the first-mined coal seam of the short-distance outburst coal seam group, the bottom suction roadway and the bottom mining bedding drainage drill hole are tunneled in the lower adjacent coal seam, and gas in the lower adjacent coal seam is pre-pumped in advance through the bottom suction roadway and the bottom mining bedding drainage drill hole, so that the mining safety of the first-mined coal seam working face and the lower adjacent coal seam is improved. In addition, the bottom suction roadway can be used as a crossheading of an adjacent coal seam in later mining, when the adjacent coal seam is mined, the track crossheading and/or the adhesive tape crossheading are preset in advance, and then the ventilation system of the mining working face can be formed after the cut hole corresponding to the mining working face is excavated, so that the excavation time of the single-head roadway is shortened, and the mining safety is improved. In addition, when the first-mining coal seam is mined, the bottom mining bedding drainage hole can timely drain gas near the lower adjacent coal seam pre-drainage hole; after the first-mining coal seam is mined, the interlayer can release pressure and increase the permeability in a large area, and the bottom mining bedding pumping hole can intercept gas in the adjacent coal seam from flowing to the mining empty area of the first-mining coal seam through the interlayer, so that the gas collection and treatment are facilitated.
According to the gas control method for the first-mined coal seam of the short-distance outburst coal seam group, disclosed by the embodiment of the invention, the arrangement mode of forming four lanes on one side by forming the high pumping lane, the track gate lane, the adhesive tape gate lane and the bottom pumping lane on the working face to be mined and forming a gas discharge (drainage) passage by combining the cross-layer pre-pumping drilling hole, the cutting hole, the first-mined gate layer drilling hole and the bottom-mined gate layer pumping drilling hole, so that the gas control effect is good, the return air flow and the gas at the upper corner are reduced and not over-limit, and the safety of the first-mined coal seam of the short-distance outburst coal seam group is further improved.
Therefore, the gas control method for the first coal seam of the short-distance outburst coal seam group has the advantages of reducing the mining cost and improving the safety and the mining efficiency; meanwhile, the concentration of the gas at the upper corner and the return air flow is reduced, and the problem that the gas at the upper corner and the return air flow exceeds the limit can be solved.
In some embodiments, in step S1, the high-suction roadway is tunneled in parallel with the original track gate, and the distance between the bottom wall of the high-suction roadway and the first coal seam is unchanged.
In some embodiments, the high suction roadway is spaced from the face to be mined by 8-12 times the mining height of the first-mined coal seam.
In some embodiments, in step S1, a plurality of pre-extraction holes are arranged below the high-extraction roadway, the plurality of pre-extraction holes extend obliquely downward, and a lower end of each pre-extraction hole extends to the interlayer.
In some embodiments, each of the perforated pre-drilled holes extends for a length of 1m to 2m in a portion of the interlayer.
In some embodiments, in step S2, the area having or adjacent to the through-layer pre-extraction bore hole on the working face to be mined is excavated into and out of the rail gateway and the cutting hole corresponding to the working face to be mined.
In some embodiments, the track gate is tunneled adjacent to the high suction roadway as compared to the tape gate.
In some embodiments, at least a portion of the plurality of cross-cut pre-extraction boreholes is located at a minimum distance of greater than or equal to 15m from each of the trackway and the cutting eye from a face to be mined.
In some embodiments, in step S2, a plurality of the leading bedding holes are arranged in a region of the face to be mined between the rail gateway and the tape gateway, each of the plurality of leading bedding holes extending in the direction of the cutting hole.
In some embodiments, at least one of the leading bedding holes extends from the track gateway in a direction of the tape gateway, and at least another of the leading bedding holes extends from the tape gateway in a direction of the track gateway.
In some embodiments, the length of at least one of the lead bedding boreholes and the length of at least one other of the lead bedding boreholes have a region of overlap in the direction of heading of the face to be mined.
In some embodiments, the length of the overlap region is at least 10 m.
In some embodiments, in step S3, the direction of extension of the bottom cut bedding extraction bore is parallel to the direction of mining along the face to be mined.
Drawings
Fig. 1 is a mining layout of a first seam of a short run outburst coal seam group according to one embodiment of the present invention.
Fig. 2 is a drill hole layout for a first seam of a short-reach outburst coal seam group according to an embodiment of the invention.
Fig. 3 is a cross-sectional view of a roadway layout of a first seam of a short-reach outburst coal seam group in accordance with an embodiment of the present invention.
Fig. 4 is yet another cross-sectional view of a roadway layout of a first seam of a short reach outburst coal seam group in accordance with an embodiment of the present invention.
Fig. 5 is a first process schematic view of a gas control method for a first coal seam of a short-distance outburst coal seam group according to an embodiment of the invention.
Fig. 6 is a process schematic diagram of a second method for controlling gas in a first coal seam of a short-distance outburst coal seam group according to the embodiment of the invention.
Fig. 7 is a third process schematic view of the gas control method for the first coal seam of the short-distance outburst coal seam group according to the embodiment of the invention.
Fig. 8 is a fourth process schematic view of the gas control method for the first coal seam of the short-distance outburst coal seam group according to the embodiment of the invention.
Reference numerals:
a first-mined coal seam 100;
an original track crossheading 11; a mined work surface 12; a working face to be mined 13; a track gate 131; an incision 132; a tape gate 133; first-trip drilling 134; a first primary production bore 1341, a second primary production bore 1342;
a lower adjacent coal seam 200;
a bottom suction lane 21; a bottom mining bedding-in extraction borehole 22;
a high suction lane 300; a layer-through pre-pump borehole 400;
the 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 with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The method for controlling gas in the first coal seam of the short-distance outburst coal seam group according to the embodiment of the invention is described below with reference to fig. 1 to 8.
The near outburst coal seam group comprises a first mining coal seam 100, a lower adjacent coal seam 200 and an interlayer 400 positioned between the first mining coal seam 100 and the lower adjacent coal seam 200, wherein the first mining coal seam 100 is provided with a mined working face 12 and an original orbit crossheading 11 corresponding to the mined working face 12. The short-distance coal seam group is a coal seam group which is formed by two or more than two coal seams and has a distance between two adjacent coal seams of 10m-20 m; the outburst coal seam refers to a coal seam with coal and gas outburst.
The gas control steps of the first coal seam of the close-range outburst coal seam group of the embodiment of the invention are as follows:
s1 excavates into and out of the high-draft roadway 300 at an area of the fractured zone above the to-be-mined work surface 13 adjacent to the mined work surface 12, and arranges a layer-penetrating pre-extraction bore 400 downward from the high-draft roadway 300, as shown in fig. 3 to 5, for example.
S2 digging into and out of the rail gateway 131 and the cutting hole 132 corresponding to the working face 13 to be mined on the working face 13 to be mined, the original rail gateway 11 is left as the adhesive tape gateway 133 of the working face 13 to be mined by way of gob-side entry retaining, and the corresponding first mining gateway 134 is disposed in the working face 13 to be mined to form a gas discharge (suction) passage communicating with the pressure relief area corresponding to the working face 13 to be mined, as shown in fig. 4 and 6, for example.
S3 excavating a bottom suction tunnel 21 in the lower adjacent coal seam 200 after the excavation of the working face 13 to be mined is finished, the bottom suction tunnel 21 is located in the pressure relief area corresponding to the working face 13 to be mined after the excavation is finished, and a bottom mining bedding suction hole 22 communicated with a suction pipeline of the bottom suction tunnel 21 is arranged in the lower adjacent coal seam 200, wherein the bottom suction tunnel 21 can be used as a track gateway 131 and/or a tape gateway 133 of the lower adjacent coal seam 200, for example, as shown in fig. 7 and 8. It is understood that, when the adjacent coal seam 200 is mined, for different working faces of the adjacent coal seam 200, the adjacent coal seam 200 has N working faces to be mined, and the tape gateway and the track gateway corresponding to a certain working face to be mined of the adjacent coal seam 200 are both the bottom suction lane located in the adjacent coal seam 200.
For example, the mth working face to be mined of the lower adjacent coal seam 200 is the mth suction roadway and the M +1 th suction roadway are two corresponding gate roads of the mth working face to be mined. The M +1 th working face to be mined adjacent to the coal seam 200 below is respectively the M +1 th bottom suction lane and the M +2 th bottom suction lane which are respectively two corresponding gate ways of the M +1 th working face to be mined, and so on, wherein M is an integer.
S4 repeats steps S1-S3 until the first coal seam 100 is mined.
According to the gas control method for the first-mined coal seam of the short-distance outburst coal seam group, the original track crossheading 11 is used as the adhesive tape crossheading 133 corresponding to the working face 13 to be mined, only the track crossheading 131 and the cutting hole 132 corresponding to the working face 13 to be mined need to be excavated for the working face 13 to be mined in the tunneling process, and a new adhesive tape crossheading 133 is not required to be excavated again, so that the construction of the adhesive tape crossheading 133 (the construction of tunneling the adhesive tape crossheading 133 and the track crossheading 13S 1) corresponding to the first-mined coal seam 100 is reduced, the construction efficiency is improved, the construction cost is reduced, in addition, the tunneling time of a single-head roadway (namely, the total time for tunneling the track crossheading, the cutting hole and the adhesive tape crossheading) is reduced, the ventilation system corresponding to the working face 13 to be mined is formed in time, and the mining safety is improved.
According to the gas control method for the first coal seam mined by the short-distance outburst coal seam group, the bottom suction roadway 21 and the bottom mining bedding layer suction drill hole 22 are tunneled in the lower adjacent coal seam 200, and gas in the lower adjacent coal seam 200 is pre-pumped in advance through the bottom suction roadway 21 and the bottom mining bedding layer suction drill hole 22, so that the safety of the lower adjacent coal seam 200 mined is improved. In addition, the bottom suction roadway 21 can be used as a gateway of the adjacent coal seam 200 mined in the later period, when the adjacent coal seam 200 mined in the later period is mined, the track gateway 131 and/or the adhesive tape gateway 133 are preset in advance, and a ventilation system corresponding to the mining working face can be formed after the corresponding cutting hole 132 corresponding to the mining working face is excavated, so that the excavation time of the single-end roadway is shortened, and the mining safety is improved. In addition, when the first coal seam 100 is mined, the bottom mining bedding surface pumping hole 22 is used as a pre-pumping hole of the lower adjacent coal seam 200 to pump out gas in the lower adjacent coal seam 200 in time; in the process of mining the first coal seam 100, a large area of pressure relief and permeability increase can occur in the interlayer 400, the bottom mining bedding drainage hole 22 can enable gas near the bottom mining bedding drainage hole 22 to be released to a bottom drainage roadway through the bottom mining bedding drainage hole 22, gas in a lower adjacent coal seam 200 corresponding to the bottom mining bedding drainage hole 22 is prevented from flowing upwards to a mining empty area of the first coal seam 100, and gas collection and treatment are facilitated.
According to the gas control method for the first-mined coal seam of the short-distance outburst coal seam group, disclosed by the embodiment of the invention, the high-suction roadway 300, the track gateway 131 and the adhesive tape gateway 133 corresponding to the working face to be mined are formed above the working face 13 to be mined, the four-roadway arrangement mode is formed on the bottom-suction roadway 21 corresponding to the lower adjacent coal seam 200, and the through-layer pre-suction drilling hole 400, the cutting hole 132, the first-mining gateway drilling hole 134 and the bottom-mining gateway drilling hole 22 are combined to form a gas discharge (drainage) passage, so that the gas control effect is good, the return air flow and the gas at the upper corner are reduced and not over-limit, and the mining safety of the first-mined coal seam of the short-distance outburst coal seam group is further improved.
Therefore, the gas control method for the first coal seam of the short-distance outburst coal seam group has the advantages of reducing the mining cost and improving the safety and the mining efficiency; meanwhile, the gas concentration of the upper corner and the return air flow is reduced, and the gas treatment effect is good.
In step S1, when the high-pressure suction roadway 300 is drilled, the high-pressure suction roadway 300 is drilled in parallel with the original gateway 11, and the distance between the bottom wall of the high-pressure suction roadway 300 and the first coal seam 100 is not changed.
According to the embodiment of the invention, the near-distance outburst coal seam group first-mined coal seam is tunneled in parallel with the original track gateway 11 through the high-level extraction roadway 300, the distance between the bottom wall of the high-level extraction roadway 300 and the first-mined coal seam 100 is unchanged, and the relative stability of the size and the angle of the through-layer pre-extraction drill hole 400 at the same height position along the length direction of the high-level extraction roadway 300 in the arrangement of the through-layer pre-extraction drill hole 400 is beneficial to improving the efficiency of arrangement of the through-layer pre-extraction drill hole 400.
Optionally, the distance between the high suction roadway 300 and the working face 13 to be mined is 8 times to 12 times of the mining height of the first mining coal seam. The tunneling length of the cross-layer pre-pumping drilling hole 400 can be shortened, and the construction efficiency of the cross-layer pre-pumping drilling hole 400 is improved.
In step S1, a plurality of pre-extraction via holes 400 are arranged downward from the high-level extraction tunnel 300, the plurality of pre-extraction via holes 400 extend obliquely downward, and the lower end of each pre-extraction via hole 400 extends to the interlayer 400. At this time, the gas in the working face 13 to be mined and the pressure relief area corresponding to the working face 13 to be mined is released into the high-level suction roadway 300 through the layer-penetrating pre-drainage drill hole 400, and is then timely drained out.
According to the gas control method for the first coal seam of the short-distance outburst coal seam group, provided by the embodiment of the invention, the plurality of cross-layer pre-drainage drill holes 400 are arranged, and the plurality of cross-layer pre-drainage drill holes 400 extend towards the inclined lower part, so that the range of gas drainage of the cross-layer pre-drainage drill holes 400 is enlarged, and the gas drainage effect can be further improved.
Optionally, each of the perforated pre-extraction holes 400 extends over a length of 1m to 2m of the portion of the interlayer 400. Since a part of the coal slag and the residual water are not discharged during the beginning of the cross-layer pre-drilled hole 400, the coal slag and the residual water are deposited in the lower end region of the cross-layer pre-drilled hole 400. According to the gas control method for the first coal seam of the short-distance outburst coal seam group, the length of the part, extending to the interlayer 400, of the cross-layer pre-drainage drill hole 400 is 1m-2m, so that coal slag and residual water are accumulated in the interlayer 400, the part, above the interlayer 400, of the cross-layer pre-drainage drill hole 400 is communicated, and the gas drainage effect of the cross-layer pre-drainage drill hole 400 is improved.
In step S2, the area having the through-layer pre-extraction hole 400 in the face 13 to be mined or adjacent to the through-layer pre-extraction hole 400 is excavated in and out of the gateway 131 and the incisions 132 corresponding to the face 13 to be mined. In other words, the position of the trackway 131 corresponding to the working surface 13 to be mined is determined according to the position of the lower end of the through-layer pre-drawing borehole 400.
According to the gas control method for the first-mined coal seam of the short-distance outburst coal seam group, disclosed by the embodiment of the invention, the gas is pre-pumped in advance in the area corresponding to the working face 13 to be mined through the layer-penetrating pre-pumping drill hole 400, and then the working face 13 to be mined is tunneled out of the track crossheading 131, so that the upper corner and the return air flow gas are prevented from exceeding the limit, and the safety in the tunneling process is further improved.
In contrast to the tape gate 133, the track gate 131 is tunneled adjacent to the high suction roadway 300.
According to the gas control method for the first-mined coal seam of the short-distance outburst coal seam group, provided by the embodiment of the invention, by tunneling the track gate 131 adjacent to the high-pumping roadway 300, the length of the cross-layer pre-pumping drill hole 400 (one end of the cross-layer pre-pumping drill hole 400 is communicated with the high-pumping roadway 300, and the other end of the cross-layer pre-pumping drill hole 400 is communicated with the track gate 131 or is arranged close to the track gate 131) can be shortened, and the construction efficiency and the construction cost of the cross-layer pre-pumping drill hole 400 are further improved.
At least a portion of the plurality of cross-cut pre-extraction boreholes 400 are located a minimum distance of greater than or equal to 15m from each of the gateway 131 and the kerfs 132 of the face 13 to be mined. That is, at least a part of the plurality of perforated pre-extraction holes 400 is located at a minimum distance of 15m or more from the rail crossheading 131 of the working surface 13 to be mined, and at least a part of the plurality of perforated pre-extraction holes 400 is located at a minimum distance of 15m or more from the cutting hole 132 of the working surface 13 to be mined.
According to the gas control method for the first-mined coal seam of the short-distance outburst coal seam group, provided by the embodiment of the invention, the lower end of the partial cross-layer pre-drainage drill hole 400 extends outwards to the area, close to or communicated with the rail crossheading 131, of the working face 13 to be mined, so that the range of the pressure relief area is increased, the pressure relief effect is further improved, and the mining safety is further improved.
Specifically, one end of each of the multiple layered pre-extraction drill holes 400 is communicated with the high-extraction roadway 300, and the other end of one part of the layered pre-extraction drill holes 400 extends outward to the area of the working surface 13 to be mined, which is close to or communicated with the rail gate 131.
In step S2, a plurality of leading bedding holes 134 are arranged in a region of the face to be mined 13 between the rail gateway 131 and the tape gateway 133, each of the plurality of leading bedding holes 134 extending in the length direction of the cutting hole 132.
According to the gas control method for the first-mined coal seam of the short-distance outburst coal seam group, provided by the embodiment of the invention, gas in the working face 13 to be mined can be lifted to be pumped out through the plurality of first-mined bedding drill holes 134, specifically, the gas in the working face 13 to be mined overflows into the first-mined bedding drill holes 134 and is pumped out through at least one of the adhesive tape bedding groove 133, the cutting hole 132 and the track bedding groove 131 of the working face 13 to be mined. In order to increase the air exhaust capacity of the ventilation channel formed by the adhesive tape crossheading 133, the cutting hole 132 and the rail crossheading 131 of the working surface 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 leading layer borehole 134 extends from the tape gateway 131 in the direction of the tape gateway 133, and at least one other leading layer borehole 134 extends from the tape gateway 133 in the direction of the tape gateway 131. In other words, the first-pass wellbore 134 may be bi-directionally drilled. Therefore, the efficiency of the first-mining bedding drilling 134 is increased, and the difficulty of the construction of the first-mining bedding drilling 134 is reduced.
For example, the first mining drill hole 134 extending from the track gateway 131 to the tape gateway 133 is defined as a first mining drill hole 1341, the first mining drill hole 134 extending from the tape gateway 133 to the track gateway 131 is defined as a second mining drill hole 1342, and the first mining drill hole 1341 and the second mining drill hole 1342 are spaced apart.
Optionally, the length of at least one of the first bedding boreholes 134 and the length of at least one other of the first bedding boreholes 134 have an overlap region in the direction of development of the coal seam. In other words, the first and second lead boreholes 1341, 1342 have an overlap region in the heading direction of the face 13 to be mined. The gas release speed is increased, and the gas treatment speed of the short-distance outburst coal seam group can be increased.
Optionally, the length of the overlap region is at least 10 m.
In step S3, the direction of extension of the bottom cut bedding extraction bore 22 is parallel to the direction of mining along the mined face 12 to the face to be mined 13.
Alternatively, the bottom cut bedding extraction hole 22 is arranged in the lower adjacent coal seam 200 in a direction in which the lower adjacent coal seam 200 extends upward or downward, which has an advantage of convenience in construction.
Optionally, the bottom cut bedding extraction bore 22 and the cuthole 132 or the top cut bedding extraction bore 134 are disposed parallel to each other. At this time, under the condition that the length of the bottom mining bedding surface pumping hole 22 is fixed, the effective distance of the bottom mining bedding surface pumping hole 22 along the extending direction of the lower adjacent coal seam 200 is the largest, and the construction efficiency of the bottom mining bedding surface pumping hole 22 is improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The gas control method for the first-mined coal seam of the short-distance outburst coal seam group is characterized in that the short-distance outburst coal seam group comprises a first-mined coal seam, a lower adjacent coal seam and an interlayer positioned between the first-mined coal seam and the lower adjacent coal seam, and the first-mined coal seam is provided with a mined working face and an original track crossheading corresponding to the mined working face; the gas control method comprises:
s1, excavating in and out a high-suction roadway at an upper fractured zone area of a to-be-mined working face adjacent to the mined working face, and arranging a layer-penetrating pre-suction drill hole downwards from the high-suction roadway;
s2, digging a track gate way and a cutting hole corresponding to the working face to be mined in and out of the working face to be mined, wherein the original track gate way is reserved in a gob-side entry retaining mode and is used as a rubber belt gate way of the working face to be mined, and a first mining gate way drilled hole is arranged in the working face to be mined so as to form a gas extraction system communicated with an extraction pipeline corresponding to the working face to be mined;
s3, after the excavation of the working face to be exploited is finished, excavating a bottom suction tunnel in the lower adjacent coal seam, wherein the bottom suction tunnel is positioned in a pressure relief area corresponding to the working face to be exploited after the excavation is finished, and a bottom exploitation bedding suction hole communicated with an extraction pipeline of the bottom suction tunnel is arranged in the lower adjacent coal seam, wherein the bottom suction tunnel can be used as a track gateway and/or a rubber belt gateway of the lower adjacent coal seam;
s4 repeating steps S1-S3 until the first coal seam mining is finished.
2. The method for controlling gas in the first coal seam of the short-distance outburst coal seam group according to claim 1, wherein in step S1, the high-suction roadway is tunneled in parallel with the original track gate, and the distance between the bottom wall of the high-suction roadway and the first coal seam is unchanged;
optionally, the distance between the high pumping roadway and the working face to be mined is 8-12 times of the mining height of the first mining coal seam.
3. The method for controlling gas in a short-distance extracted coal seam group first-mined coal seam according to claim 1, characterized in that in step S1, a plurality of cross-cut pre-drainage drill holes are arranged downward from the high-drainage roadway, the plurality of cross-cut pre-drainage drill holes extend obliquely downward, and a lower end of each of the cross-cut pre-drainage drill holes extends to the interbed;
optionally, each of the through pre-drilled holes has a length of 1m to 2m extending in a portion of the interlayer.
4. The method for controlling gas in a short-distance outburst coal seam group head mining coal seam according to claim 1, wherein in step S2, an area having the cross-layer pre-extraction drill hole or being adjacent to the cross-layer pre-extraction drill hole on the working face to be mined is excavated in and out of a rail gateway and a cutting hole corresponding to the working face to be mined.
5. The method for controlling gas in a short-distance outburst coal seam group head mining coal seam according to claim 4, wherein the track gate is tunneled adjacent to the high suction roadway compared with the tape gate.
6. The method for controlling gas in short-distance outburst coal seam group head mining coal seams according to claim 1, wherein at least one part of the plurality of the cross-layer pre-drainage drill holes is positioned at a minimum distance of 15m or more from each of the crossheading and the cutting hole on a working face to be mined.
7. The method for gas control of a short outburst coal seam group head coal seam according to claim 1, wherein in step S2, a plurality of the head bedding holes are arranged in the area of the working face to be mined between the track gate and the tape gate, each of the plurality of the head bedding holes extending along the direction of the cutting hole.
8. The method of claim 7, wherein at least one of the first cut bedding holes extends from the track bedding direction to the tape bedding direction, and at least another of the first cut bedding holes extends from the tape bedding direction to the track bedding direction.
9. The method for controlling gas in the first-mined coal seam of the short-distance outburst coal seam group according to claim 8, wherein the length of at least one first-mined bedding hole and the length of at least one other first-mined bedding hole have an overlapped area in the heading direction of the working face to be mined;
optionally, the length of the overlap region is at least 10 m.
10. The method for controlling gas in a short-distance outburst coal seam group head mining coal seam according to any one of the claims 1 to 9, wherein in the step S3, the extension direction of the bottom mining bedding pumping hole is parallel to the mining direction from the mined working face to the to-be-mined working face.
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