CN114575791A - Structure and process for extracting gas of lower protective layer through high-position high-extraction roadway and downward drilling - Google Patents
Structure and process for extracting gas of lower protective layer through high-position high-extraction roadway and downward drilling Download PDFInfo
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- CN114575791A CN114575791A CN202210204257.3A CN202210204257A CN114575791A CN 114575791 A CN114575791 A CN 114575791A CN 202210204257 A CN202210204257 A CN 202210204257A CN 114575791 A CN114575791 A CN 114575791A
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- 239000011241 protective layer Substances 0.000 title claims abstract description 176
- 238000005553 drilling Methods 0.000 title claims abstract description 102
- 238000000605 extraction Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 19
- 239000010410 layer Substances 0.000 claims abstract description 74
- 238000005065 mining Methods 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 238000005520 cutting process Methods 0.000 claims abstract description 13
- 238000005086 pumping Methods 0.000 claims description 53
- 238000010276 construction Methods 0.000 claims description 28
- 239000002390 adhesive tape Substances 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 21
- 230000008901 benefit Effects 0.000 abstract description 8
- 239000003245 coal Substances 0.000 description 24
- 239000011435 rock Substances 0.000 description 12
- 230000000149 penetrating effect Effects 0.000 description 10
- 239000000843 powder Substances 0.000 description 7
- 230000009194 climbing Effects 0.000 description 5
- 230000002265 prevention Effects 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention discloses a structure and a process for extracting gas of a lower protective layer by a high-position high-extraction roadway and a downward drill hole, wherein the structure comprises a protective layer and a protected layer positioned above the protective layer; the protective layer is internally provided with an air return gateway, a sealing-tape machine gateway and a protective layer working surface cutting hole, and a high-position high-suction roadway is arranged above the protected layer; set up a plurality of groups drilling in the lane is taken out to high-order height, 1 st group drilling is located and follows 5 ~ 10m departments of protective layer working face cutting of eyes along working face advancing direction, and each group drilling sets gradually along working face advancing direction, and adjacent two sets of drilling interval 20 ~ 40m, every group drilling divide into 3 types, include: a first bore, a second bore, and a third bore; and the first drill hole, the second drill hole and the third drill hole are all constructed in a caving zone of a mining protective layer working face. The method comprises the steps of constructing a roadway, drilling, sealing holes, extracting gas and draining water. The invention has the advantages that: the extraction structure and the extraction process are simple, and the extraction effect is good.
Description
Technical Field
The invention relates to the field of coal mine gas treatment, in particular to a structure and a process for extracting gas of a lower protective layer through a high-position high-extraction roadway and a downward drill hole.
Background
Coal and gas outburst seriously threatens the safety production of coal mines. The mining protective layer has very uniform pressure relief effect on the protected layer, and is the most reliable and effective outburst prevention measure; therefore, the protective layer must be mined in the critical area where the protective layer must be mined. The pressure relief gas of the protected layer must be extracted simultaneously in the mining protective layer, the protective effect of the protected layer is improved, and the gas of the protected layer is prevented from flowing into the working face of the protective layer, so that the production safety is threatened. In the process of mining the upper protective layer, a gas control roadway is constructed on the bottom plate of the working face of the protected layer or in the process of mining the lower protective layer in a long distance, a gas control roadway is constructed on the top plate of the working face of the protected layer (the bottom plate of the working face of the protected layer), and the pressure relief gas of the protected layer is extracted by constructing an upward cross-layer drill hole in the gas control roadway (see figure 1), so that the gas of the protected layer can be effectively extracted. In the process of mining the lower protective layer at a short distance, a construction gas treatment roadway is not arranged between the protective layer and the protected layer, a gas treatment roadway (high drainage roadway) is constructed on the top plate of the working surface of the protected layer, the position of the high drainage roadway is higher, cracks between the high drainage roadway and the working surface of the protected layer and the working surface of the protective layer do not develop, the extraction effect of the high drainage roadway is poor, and the method and the device for the gas treatment roadway are provided for solving the problems that the position of the high drainage roadway is high and the extraction effect is poor in the process of mining the lower protective layer at a short distance.
In the prior art, the damage condition of a roof rock stratum of a goaf after the mining of a working face is generally divided into three zones, namely an caving zone, a fracture zone and a bending subsidence zone, which are shown in a figure 2; along with the advance of the working surface, the goaf cracks in the middle of the working surface are gradually compacted, and a communicated mining-induced crack development area exists around the goaf and is called as a mining-induced crack O-shaped ring, which is shown in figure 3.
Disclosure of Invention
The technical problem to be solved by the invention is as follows:
the technical problems that in the process of mining a short-distance lower protective layer, the position of a high pumping roadway is high and the pumping effect is poor in the prior art are solved.
The invention solves the technical problems through the following technical means:
a high-position high-extraction roadway and downward drilling extraction lower protective layer gas structure comprises a protective layer and a protected layer located above the protective layer;
the protective layer is internally provided with an air return crossheading, a sealing-tape machine crossheading and a protective layer working face notch, and a high-position high-suction roadway is arranged above the protected layer;
the high-position high-suction roadway is positioned in a transition zone of a bent subsidence zone or a crack zone and the bent subsidence zone after the mining of the working surface of the protective layer in the vertical direction;
the high-position high-suction roadway is internally provided with a plurality of groups of drill holes, the 1 st group of drill holes are positioned at the positions 5-10m away from the cutting holes of the protective layer working face along the advancing direction of the working face, each group of drill holes are sequentially arranged along the advancing direction of the working face, the distance between two adjacent groups of drill holes is 20-40m, and each group of drill holes is classified into 3 types, including:
the first drilling can extract gas in an O-shaped ring of a mining-induced fracture near a return air crossheading of a goaf of a working face of the protective layer;
the second drilling hole can be used for extracting pressure relief gas of the protected layer;
and a third drilling hole can be used for extracting gas in an O-shaped ring of a mining-induced fracture near a gate way of the sealing-tape machine of the goaf of the protective layer working face.
When the high-position high-pumping roadway and downward drilling extraction lower protective layer gas structure is actually applied, three types of downward drilling holes at different positions are constructed in the high-position high-pumping roadway, the crack of the high-position high-pumping roadway penetrating through the working face goaf of the protective layer is increased, the downward drilling hole is constructed in the vertical direction to the caving zone of the working face goaf, the problem that the downward drilling hole is easily blocked by water and coal rock powder to influence the extraction effect of the drilling hole is solved, the extraction effect of the high-position high-pumping roadway and downward drilling hole is effectively improved through the structure, the gas safety in the working face extraction process of the protective layer is guaranteed, and the safety and social benefits are good.
Preferably, a sealing wall is arranged in the high-position high-level pumping roadway, and the sealing wall is used for burying and pressing a drainage pipeline and a pumping pipeline.
During the stoping period of the working face of the protective layer, pressure-relieved gas of the protected layer and gas in the goaf of the working face of the protective layer are directly extracted through an extraction pipeline buried in the high-position high-level roadway extraction closed wall, the extraction process is simple, and the extraction effect is good. When the high-level high-suction roadway is constructed in a mountain climbing mode, accumulated water possibly exists near the sealing wall, and water can be effectively discharged through the drainage pipeline.
And optimally, constructing the final hole positions of the first drilling hole, the second drilling hole and the third drilling hole into a caving zone of a mining protective layer working face.
Optimized, first borehole termination hole location:
constructing to the position 5-8m above the top plate of the protective layer in the vertical direction, and constructing to the position 25-50m away from the projection of the return air crossheading of the working surface of the protective layer in the horizontal direction;
in each group of the drill holes, the number of the first drill holes is 6-15.
The first drilling mainly aims to increase the crack in the mining-induced crack O-shaped ring of the high-position high-suction roadway penetrating through the goaf return air gateway of the protective layer working face, and extract the gas of the goaf of the protective layer working face and the pressure-relief gas of the protected layer.
Optimized, third hole final location:
constructing to a position 0-5m above a top plate of the protective layer in the vertical direction, and constructing to a position 5-20m away from the straight groove projection of the adhesive tape machine on the working surface of the protective layer in the horizontal direction;
in each group of the drill holes, the number of the third drill holes is 3-5.
The third drilling mainly aims at increasing the crack in the mining-induced crack O-shaped ring near the gate way of the high-position high-suction roadway penetrating through the sealing-tape machine of the protective-layer working face goaf, and pumping the gas of the protective-layer working face goaf and the pressure-relief gas of the protected layer.
Optimized, second hole final location:
constructing to a position 5-8m above a top plate of the protective layer in the vertical direction; and ensuring the distance between the bottoms of the holes drilled in the protected layer to be 20-40m in the horizontal direction.
The main purpose of the second drilling hole is to extract pressure relief gas of the protected layer.
Optimally, the orifices of the first drilling hole, the second drilling hole and the third drilling hole are sealed by sleeves, the diameter of each sleeve is matched with the diameter of each drilling hole, the diameter of each sleeve is 75-110 mm, the length of each sleeve is not less than 10m, the sealing depth is not less than 8m, and each sleeve is 0.1-0.3 m higher than the corresponding orifice.
Preferably, the high-level drawing roadway is constructed at a position which is not less than 10m above the top plate of the protected layer.
The high-level pumping roadway is constructed at a position which is not less than 10m above a protected layer top plate, so that the outburst prevention safety of the high-level pumping roadway construction can be ensured, and the influence of an outburst coal bed on the high-level pumping roadway construction is reduced.
Optimally, the working surface of the staggered protective layer in the horizontal direction of the high-level high-suction roadway has a track of 40-60 m.
The arrangement of the high-level pumping roadway position can relieve shearing damage to downward drill holes in the high-level pumping roadway.
The invention also discloses a process for constructing the high-position high-extraction roadway and downward drilling extraction lower protective layer gas structure, which comprises the following steps:
s1 construction roadway
Construction protective layer working face cutting, air return gate way, sealing-tape machine gate way and high-level high-suction roadway;
s2, drilling
Drilling downwards from the high-position high-suction roadway construction, starting to construct a 1 st group of drill holes from the high-position high-suction roadway position corresponding to the position 5-10m away from the protective layer working face cut-out along the working face advancing direction, and constructing 1 group of drill holes from the high-position high-suction roadway at intervals of 20-40m along the working face advancing direction;
each set of boreholes is classified into 3 categories, including:
the first drilling can extract gas in an O-shaped ring of a mining-induced fracture near a goaf return air gateway of a protective layer working face;
the second drilling hole can be used for extracting pressure relief gas of the protected layer;
thirdly, gas in an O-shaped ring of a mining-induced fracture near a gate way of the sealing-tape machine of the goaf on the working face of the protective layer can be extracted;
the first drill hole, the second drill hole and the third drill hole are all constructed in a caving zone of a protective layer working face in mining, and the distance between the bottoms of the drill holes in the protective layer is not more than 40 m;
s3 sealing holes
The drill hole openings are sealed by adopting sleeves, the diameter of each sleeve is matched with the hole diameter of each drill hole, the diameter of each sleeve is 75-110 mm, the length of each sleeve is not less than 10m, the hole sealing depth is not less than 8m, and the height of each sleeve is 0.1-0.3 m higher than the hole opening;
s4 construction sealing wall
Constructing a sealing wall from an outer opening of the high-position high-extraction roadway to seal the high-position high-extraction roadway, wherein all drill holes in the roadway are open before the construction of the sealing wall, an extraction pipeline does not need to be connected, and the extraction pipeline and a drainage pipeline are buried in the sealing wall;
s5, gas extraction and drainage
Connecting the extraction pipeline outside the closed wall with an extraction device to extract gas;
and connecting the outer drainage pipeline of the closed wall with a drainage device for drainage.
When the process for constructing the high-position high-suction roadway and the downward drilling hole to extract the gas structure of the lower protective layer is actually applied, three types of downward drilling holes at different positions are constructed in the high-position high-suction roadway, the crack of the working face goaf of the protective layer communicated with the high-position high-suction roadway is increased, the downward drilling hole is constructed in the vertical direction to the caving zone of the working face goaf, the problem that the downward drilling hole is easily blocked by water and coal rock powder to influence the extraction effect of the drilling hole is solved, the extraction effects of the high-position high-suction roadway and the downward drilling hole are effectively improved through the process, the gas safety in the working face extraction process of the protective layer is guaranteed, and the safe social benefit is good. During the stoping period of the working face of the protective layer, pressure-relief gas of the protected layer and gas in the goaf of the working face of the protective layer are directly extracted through an extraction pipeline buried in the high-position high-extraction roadway closed wall, the extraction process is simple, and the extraction effect is good. When the high-level high-suction roadway is used for mountain-climbing construction, accumulated water possibly exists near the sealing wall, and water can be effectively drained through the drainage pipeline.
The invention has the advantages that:
1. when the high-position high-level extraction roadway and downward drilling extraction lower protective layer gas structure is actually applied, three types of downward drilling holes at different positions are constructed in the high-position high-level extraction roadway, the crack of the high-position high-level extraction roadway penetrating through the working face goaf of the protective layer is increased, the downward drilling holes are constructed in the vertical direction to the caving zone of the working face goaf, and the problem that the downward drilling holes are easily blocked by water and coal rock powder to affect the extraction effect of the drilling holes is solved.
2. During the stoping period of the working face of the protective layer, pressure-relief gas of the protected layer and gas in the goaf of the working face of the protective layer are directly extracted through an extraction pipeline buried in the high-position high-extraction roadway closed wall, the extraction process is simple, and the extraction effect is good. When the high-level high-suction roadway is constructed in a mountain climbing mode, accumulated water possibly exists near the sealing wall, and water can be effectively discharged through the drainage pipeline.
3. The first drilling mainly aims to increase the crack in the mining-induced crack O-shaped ring of the high-position high-suction roadway penetrating through the goaf return air gateway of the protective layer working face, and extract the gas of the goaf of the protective layer working face and the pressure-relief gas of the protected layer.
4. The main purpose of the second drilling hole is to extract pressure relief gas of the protected layer.
5. The third drilling mainly aims at increasing the crack in the mining-induced crack O-shaped ring near the gate way of the high-position high-suction roadway penetrating through the sealing-tape machine of the protective-layer working face goaf, and pumping the gas of the protective-layer working face goaf and the pressure-relief gas of the protected layer.
6. The high-level pumping roadway is constructed at a position which is not less than 10m above the top plate of the protected layer, so that the outburst prevention safety of the high-level pumping roadway construction can be ensured, and the influence of an outburst coal seam on the high-level pumping roadway construction is reduced.
7. The arrangement of the high-level pumping roadway position can relieve shearing damage to downward drill holes in the high-level pumping roadway.
8. When the process for constructing the high-position high-suction roadway and the downward drilling hole to extract the gas structure of the lower protective layer is actually applied, three types of downward drilling holes at different positions are constructed in the high-position high-suction roadway, the crack of the working face goaf of the protective layer communicated with the high-position high-suction roadway is increased, the downward drilling hole is constructed in the vertical direction to the caving zone of the working face goaf, the problem that the downward drilling hole is easily blocked by water and coal rock powder to influence the extraction effect of the drilling hole is solved, the extraction effects of the high-position high-suction roadway and the downward drilling hole are effectively improved through the process, the gas safety in the working face extraction process of the protective layer is guaranteed, and the safe social benefit is good. During the stoping period of the working face of the protective layer, pressure-relief gas of the protected layer and gas in the goaf of the working face of the protective layer are directly extracted through an extraction pipeline buried in the high-position high-extraction roadway closed wall, the extraction process is simple, and the extraction effect is good. When the high-level high-suction roadway is constructed in a mountain climbing mode, accumulated water possibly exists near the sealing wall, and water can be effectively discharged through the drainage pipeline.
Drawings
FIG. 1 is a schematic diagram of gas extraction technology in a roof (floor) rock roadway construction drilling method in the prior art;
FIG. 2 is a prior art "three zone" profile of roof formation failure after face mining;
FIG. 3 is a schematic view of an "O" shaped ring for mining fractures in the prior art;
FIG. 4 is a structural section view of gas extracted from a lower protective layer by a middle-high-level extraction roadway and a downward borehole in the first embodiment of the invention;
FIG. 5 is a plan view of a structure of gas extracted from a lower protective layer in a high-altitude high-level roadway and a downward borehole in the first embodiment of the invention;
wherein the content of the first and second substances,
a protective layer-1; a protected layer-2; cutting holes on the working surface of the protective layer-3; return air crossheading-4; a gate way-5 of the adhesive tape machine; a high-level pumping lane-6; a first bore-7; a second bore-8; a third bore-9; a sealing wall-10; and an extraction pipeline-11.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 4 and 5, the high-position high-suction roadway and downward drilling lower protective layer gas extraction structure comprises a protective layer 1, a protected layer 2, a protective layer working face cutting hole 3, an air return gateway 4, a rubber belt machine gateway 5, a high-position high-suction roadway 6, a first drill hole 7, a second drill hole 8, a third drill hole 9, a sealing wall 10 and an extraction pipeline 11.
The coal or mineral seam that is first mined to eliminate or reduce the risk of outburst or rock burst from adjacent coal seams is referred to as a shield; the risk of a burst or rock burst of an adjacent coal seam is eliminated or weakened by the pressure relief of the overburden production, referred to as the overburden. The protective layer and the protected layer can be divided into an upper protective layer and a lower protective layer according to different positions of the protective layer and the protected layer; the mining of the working face of the lower protective layer can be divided into 3 types of short-distance protective layers, long-distance protective layers and ultra-long-distance protective layers according to the influences of factors such as the angle of the coal seam of the protective layer, the mining height and the distance between the lower protective layer and the protected layer. After the working surface of the short-distance protection layer is mined, the protected layer is positioned in the caving zone or the fissure zone of the top plate of the working surface of the protection layer, the stress of the protected layer is reduced, the air permeability is increased, the gas pressure is reduced, and the gas of the protected layer easily flows into the working surface of the protection layer.
In this embodiment, the protected layer 2 is located above the protection layer 1; the protective layer 1 is internally provided with an air return crossheading 4, an adhesive tape machine crossheading 5 and a protective layer working face cutting hole 3, and a high-level high-suction roadway 6 is arranged above the protected layer 2.
As shown in fig. 4, the distance between the protective layer and the protected layer is 35m, and 2 thin coal seams with a thickness of 0.5-1.3m are formed between the protective layer and the protected layer, and the 2 thin coal seams are all protruding coal seams, so that the condition of constructing a high-level roadway between the protective layer and the protected layer is not met. In order to ensure the outburst prevention safety of the high pumping roadway construction and reduce the influence of the outburst coal bed on the high pumping roadway construction, the high pumping roadway construction is carried out at the position which is not less than 10m above the top plate of the protected layer, in the embodiment, the high pumping roadway construction is carried out at the position which is 15m above the top plate of the protected layer, namely, the high pumping roadway is located at the position which is 50m above the top plate of the working face of the protected layer. After the mining of the working surface of the protective layer is carried out in the implementation place, the height of the caving zone is 8-20m above the top plate, the height of the fissure zone is 40-60m above the top plate, the high-position high-suction roadway 6 is positioned in a bent subsidence zone or a transition zone of the fissure zone and the bent subsidence zone after the mining of the working surface of the protective layer in the vertical direction, and the vertical fissure of the high-position high-suction roadway 6 is not sufficient. In order to relieve shearing damage to downward drill holes in the high-position high-suction roadway, the rails of the staggered protective layer working surface in the horizontal direction of the high-position high-suction roadway 6 are arranged along 40-60m, preferably 50m, and are relatively less affected by the working mining of the protective layer; roadway section of 12m2The section meets the drilling construction requirement, the roadway is constructed in a mountain, and the roadway is easy to drain water.
The high-position high-suction roadway 6 is internally provided with a plurality of groups of drill holes, the 1 st group of drill holes are positioned at the positions 5-10m away from the cutting holes 3 of the protective layer working face along the advancing direction of the working face, each group of drill holes are sequentially arranged along the advancing direction of the working face, the distance between every two adjacent groups of drill holes is 20-40m, and each group of drill holes is classified into 3 types, which comprises the following steps:
the first drill hole 7 can extract gas in an O-shaped ring of a mining-induced fracture near the return air gate 4 of the working face of the protective layer 1
The second borehole 8 can extract pressure relief gas of the protected layer 2;
and the third drill hole 9 can be used for extracting gas in an O-shaped ring of the mining-induced fracture near the gate way 5 of the sealing-tape machine of the working face of the protective layer 1.
The first drill hole 7, the second drill hole 8 and the third drill hole 9 are all constructed in a caving zone of a working face of the mined protective layer 1, and the aperture of each of the first drill hole 7, the second drill hole 8 and the third drill hole 9 is 100-133 mm.
The number of first boreholes 7 in each group of boreholes is 6 to 15. Specifically, with reference to fig. 4 and 5, in each group of boreholes in this embodiment, 10 first boreholes 7 are constructed, with an aperture of 133 mm; final hole position of first drilled hole 7: and constructing to the position 5-8m above the top plate of the protective layer 1 in the vertical direction, and constructing to the position 25-50m away from the projection of the return air gateway 4 of the working surface of the protective layer 1 in the horizontal direction.
In each group of the drill holes, 2 second drill holes 8 are constructed, and the aperture is 133 mm; final hole position of second drilled hole 8: constructing to the position 5-8m above the top plate of the protective layer 1 in the vertical direction, and ensuring that the distance between the bottoms of the holes drilled in the protective layer (2) is not more than 40 m; in each group of drilling holes, 2 second drilling holes 8 are constructed, wherein the final hole of one second drilling hole 8 is 20-40m away from the first drilling hole in the horizontal direction, and the final hole of the other second drilling hole 8 is 20-40m away from the third drilling hole in the horizontal direction.
In each group of the drill holes, the number of the third drill holes 9 is 3-5, 4 third drill holes 9 are constructed in the embodiment, and the aperture is 133 mm; final hole position of third drilled hole 9: and constructing to a position 0-5m above a top plate of the protective layer 1 in the vertical direction, and constructing to a position 5-20m away from the projection plane of the adhesive tape machine gateway 5 on the working surface of the protective layer 1 in the horizontal direction.
The orifices of the first drill hole 7, the second drill hole 8 and the third drill hole 9 are sealed by sleeves, the diameter of each sleeve is matched with the diameter of each drill hole, the diameter of each sleeve is 75-110 mm, the length of each sleeve is not less than 10m, the sealing depth is not less than 8m, and each sleeve is 0.1-0.3 m higher than the corresponding orifice. In the embodiment, the diameter of the sleeve is 90mm, the length of the sleeve is 12m, the hole sealing depth is 10m, and the height of the sleeve above the hole opening is 0.2 m.
As shown in fig. 5, a sealing wall 10 is arranged in the high-level pumping roadway 6, the sealing wall 10 buries and presses a drainage pipeline and a pumping pipeline 11, the diameter of the drainage pipeline is 100mm, and the drainage pipeline is buried and pressed to a position 2m inside the sealing wall; the diameter of the extraction pipeline 11 is 426mm, and the extraction pipeline is buried 50m inside the airtight wall. The airtight wall 10 is built by stone, 2 walls are constructed, the space between the walls is 2m, and the two walls are filled by concrete and cement paste. When the gas extraction device is applied, the outer extraction pipeline 11 of the closed wall is connected with the extraction device to extract gas; and connecting the outer drainage pipeline of the closed wall with a drainage device for drainage. The extraction device and the drainage device are both in the prior art.
The working principle is as follows:
the protective layer working face high-suction roadway is used for extracting pressure relief gas of a protected layer and goaf gas of the protective layer working face in the protective layer working face mining process. Under the conventional condition, the arrangement position of the high-pumping roadway is positioned in a mining-induced fracture O-shaped ring in a working face goaf fracture zone in the vertical direction and close to the air return gate in the horizontal direction, the coal-rock body in the zone is fully decompressed, the fracture develops, the gas concentration is high, and the gas pumping effect is good.
The protective layer working face is mined in a close range, and the high pumping roadway arranged at the position of the top plate of the protected layer can only be arranged in a transition area of a bending subsidence zone or the bending subsidence zone and a fissure zone in the vertical direction and cannot be stably arranged in a goaf fissure zone of the protective layer working face, namely the high pumping roadway; the high-position high-drainage roadway is directly adopted to treat poor gas effect of the working face of the protective layer, a downward drill hole is constructed in the high-position high-drainage roadway, and the high-position high-drainage roadway is additionally provided with a crack which penetrates through the goaf of the working face of the protective layer, so that the drainage effect of the high-position high-drainage roadway is improved. In order to relieve the shearing damage of downward drilling holes in the high-position high-suction roadway, the rails of the working surface of the staggered protection layer in the horizontal direction of the high-position high-suction roadway are arranged along 50m, and the edges of an O-shaped ring of mining-induced fractures are positioned near the return air crossheading of the working surface; the downward drill hole is constructed in the vertical direction to a working face goaf caving zone, and after the working face is stoped to the drilling position, the drill hole is communicated with the protective layer working face goaf, so that the problem that the downward drill hole is easily blocked by water and coal rock powder to influence the drilling and extracting effect is solved. According to the gas extraction rule of a high-position high-level extraction roadway and the pressure-relief gas emission rule of a protected layer, 10 drill holes are respectively constructed in each group of downward drill holes in the horizontal direction to a goaf return air along groove side crack development zone (25-50 m away from the projection plane distance of the return air along groove), 4 drill holes to a goaf sealing-tape machine along groove side crack development zone (5-20 m away from the projection plane distance of the sealing-tape machine along groove), and 2 drill holes are supplemented to the protected layer.
And (3) finishing construction before mining of the protective layer working face by all downward drill holes in the high-position high-pumping roadway, permanently sealing the outer opening of the high-position high-pumping roadway before stoping of the protective layer working face, burying a pressure extraction pipeline into the high-position high-pumping roadway by using a sealing wall, and directly extracting pressure-relief gas of the protected layer and goaf gas of the protective layer working face through extraction negative pressure of the extraction pipeline.
When the high-position high-pumping roadway and downward drilling extraction lower protective layer gas structure is actually applied, three types of downward drilling holes at different positions are constructed in the high-position high-pumping roadway, the crack of the high-position high-pumping roadway penetrating through the working face goaf of the protective layer is increased, the downward drilling hole is constructed in the vertical direction to the caving zone of the working face goaf, the problem that the downward drilling hole is easily blocked by water and coal rock powder to influence the extraction effect of the drilling hole is solved, the extraction effect of the high-position high-pumping roadway and downward drilling hole is effectively improved through the structure, the gas safety in the working face extraction process of the protective layer is guaranteed, and the safety and social benefits are good.
During the stoping period of the working face of the protective layer, pressure-relief gas of the protected layer and gas of the goaf of the working face of the protective layer are directly extracted through an extraction pipeline 11 buried in the airtight wall 10 of the high-position high-level roadway 6, the extraction process is simple, and the extraction effect is good. When the high-level high-suction roadway 6 is constructed in a mountain climbing mode, accumulated water possibly exists near the sealing wall, and water can be effectively discharged through the drainage pipeline.
The first drilling 7 is mainly used for increasing the crack in an O-shaped ring of a mining-induced crack near a return air gateway of a high-position high-suction roadway penetrating through a protective layer working face goaf, and extracting gas of the protective layer working face goaf and pressure-relief gas of a protected layer.
The main purpose of the second borehole 8 is to extract the pressure relief gas of the protected zone.
The third drilling hole 9 mainly aims to increase the crack in the mining-induced crack O-shaped ring near the gate way of the high-position high-suction roadway penetrating through the sealing-tape machine of the protective-layer working face goaf, and extract the gas of the protective-layer working face goaf and the pressure-relief gas of the protected layer.
The high-level pumping roadway 6 is constructed 15m above the top plate of the protected layer 2, so that the construction outburst prevention safety of the high-level pumping roadway 6 can be ensured, and the influence of an outburst coal seam on the construction of the high-level pumping roadway 6 is reduced.
The arrangement of the position of the high-level pumping roadway 6 can relieve the shearing damage of the downward drilling hole in the high-level pumping roadway 6.
The second embodiment:
the invention also discloses a process for constructing the high-position high-extraction roadway and downward drilling extraction lower protective layer gas structure, which comprises the following steps:
s1 construction roadway
The construction protective layer working face is provided with a cutting hole 3, an air return gateway 4, a sealing-tape machine gateway 5 and a high-level high-suction roadway 6;
in order to realize the mining of the working face of the protective layer, the roadways such as the protective layer working face cutting hole 3, the return air crossheading 4, the belt conveyor crossheading 5, the high-position high-suction roadway 6 and the like need to be designed in advance, and the roadways such as the high-position high-suction roadway 6 and the like need to be constructed in advance. In the embodiment, the working surface of the protective layer of the implementation site is arranged by adopting an inclined strip, the working surface of the protective layer is 200m long, the mining thickness of the protective layer is 4m, the distance between the protective layer and the protected layer is 35m, 2 thin coal seams with the thickness of 0.5-1.3m are arranged between the protective layer and the protected layer, and the 2 thin coal seams are all outburst coal seams.
S2, drilling
Constructing downward drilling from the high-position high-suction roadway 6, starting to construct a 1 st group of drilling from the position of the high-position high-suction roadway 6 corresponding to the position of the protective layer working face cutting hole 3 along the advancing direction of the working face by 5m, and constructing 1 group of drilling from the high-position high-suction roadway 6 every 20m along the advancing direction of the working face;
each set of boreholes is classified into 3 categories, including:
the first drill hole 7 can extract gas in an O-shaped ring of a mining-induced fracture near the goaf air return gate 4 of the working face of the protective layer 1;
the second borehole 8 can extract pressure relief gas of the protected layer 2;
the third drill hole 9 can extract gas in an O-shaped ring of a mining-induced fracture near the gate way 5 of the sealing-tape machine of the working face goaf of the protective layer 1;
the first drill hole 7, the second drill hole 8 and the third drill hole 9 are all constructed in a caving zone of the working surface of the mined protective layer 1; ensuring that the distance between the bottoms of the holes drilled in the protected layer 2 is not more than 40 m;
s3 sealing holes
The holes of the drill holes are sealed by DN90 polyvinyl chloride sleeves, the length of the sleeves is 12m, the sealing depth is 10m, and the height of the sleeves is 0.2m higher than the holes;
s4 construction sealing wall
Before the stoping of the protective layer working face, constructing a sealing wall from the outer opening of the high-position pumping roadway 6 to seal the high-position pumping roadway 6, wherein all drill holes in the roadway are open without connecting pumping pipelines before the construction of the sealing wall, and burying and pressing the pumping pipeline 11 and the drainage pipeline in the sealing wall;
s5, gas extraction and drainage
Connecting the outer extraction pipeline 11 of the closed wall with an extraction device to extract gas;
and connecting the outer drainage pipeline of the closed wall with a drainage device for drainage.
When the process for constructing the high-position high-suction roadway and the downward drilling hole to extract the gas structure of the lower protective layer is actually applied, three types of downward drilling holes at different positions are constructed in the high-position high-suction roadway, the crack of the high-position high-suction roadway penetrating through the working face goaf of the protective layer is increased, the downward drilling hole is constructed in the vertical direction to the caving zone of the working face goaf, the problem that the downward drilling hole is easily blocked by water and coal rock powder to influence the extraction effect of the drilling hole is solved, the extraction effect of the high-position high-suction roadway and the downward drilling hole is effectively improved through the process, the gas safety in the working face extraction process of the protective layer is ensured, and the safety and social benefits are good. During the stoping period of the working face of the protective layer, pressure-relief gas of the protected layer and gas of the goaf of the working face of the protective layer are directly extracted through an extraction pipeline 11 buried in the airtight wall 10 of the high-position high-level roadway 6, the extraction process is simple, and the extraction effect is good. When the high-level high-suction roadway 6 is constructed in a mountain climbing mode, accumulated water possibly exists near the sealing wall, and water can be effectively discharged through the drainage pipeline.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a high-order height is taken out lane and is taken out protective layer gas structure down to drilling drainage, its characterized in that: comprises a protective layer (1) and a protected layer (2) positioned above the protective layer (1);
the protective layer (1) is internally provided with an air return crossheading (4), a sealing-tape machine crossheading (5) and a protective layer working face cutting hole (3), and a high-level high-suction roadway (6) is arranged above the protected layer (2);
the high-position high-suction roadway (6) is positioned in a transition zone of a bent subsidence zone or a crack zone and the bent subsidence zone after the mining of the protective layer working surface in the vertical direction;
set up a plurality of groups drilling in high-order height lane (6), the 1 st group drilling is located and follows protective layer working face eager eye (3) along 5 ~ 10m departments of working face advancing direction, and each group's drilling sets gradually along working face advancing direction, and adjacent two sets of drilling intervals are 20 ~ 40m, and every group drilling divides 3 types, includes:
the first drill hole (7) can extract gas in an O-shaped ring of a mining-induced fracture near a goaf air return gate (4) of the working face of the protective layer (1);
the second drill hole (8) can be used for extracting pressure relief gas of the protected layer (2);
and the third drill hole (9) can extract gas in an O-shaped ring of a mining-induced fracture near the gate way (5) of the sealing-tape machine of the goaf on the working face of the protective layer (1).
2. The high-position high-suction roadway and downward borehole extraction lower protective layer gas structure according to claim 1, characterized in that: a sealing wall (10) is arranged in the high-position high-level pumping roadway (6), and the sealing wall (10) is buried in a pressure drainage pipeline and a pumping pipeline (11).
3. The high-position high-suction roadway and downward borehole extraction lower protective layer gas structure according to claim 1, characterized in that: and the final hole positions of the first drill hole (7), the second drill hole (8) and the third drill hole (9) are all constructed in a caving zone of the working surface of the mined protective layer (1).
4. The high-position high-suction roadway and downward drilling lower protective layer gas extraction structure according to claim 1, characterized in that: final hole position of the first drilled hole (7):
constructing to a position 5-8m above a top plate of the protective layer (1) in the vertical direction, and constructing to a position 25-50m away from the projection of a return air gateway (4) of the working surface of the protective layer (1) in the horizontal direction;
in each group of the drill holes, the number of the first drill holes (7) is 6-15.
5. The high-position high-suction roadway and downward borehole extraction lower protective layer gas structure according to claim 1, characterized in that: final hole position of the third drilled hole (9):
constructing to a position 0-5m above a top plate of the protective layer (1) in the vertical direction, and constructing to a position 5-20m away from the projection plane of the adhesive tape machine gateway (5) on the working surface of the protective layer (1) in the horizontal direction;
in each group of the drill holes, the number of the third drill holes (9) is 3-5.
6. The high-position high-suction roadway and downward drilling lower protective layer gas extraction structure according to claim 1, characterized in that: final hole position of the second drilling hole (8):
constructing to a position 5-8m above the top plate of the protective layer (1) in the vertical direction; the distance between the bottoms of the holes drilled in the protected layer (2) is ensured to be 20-40m in the horizontal direction.
7. The high-position high-suction roadway and downward drilling lower protective layer gas extraction structure according to claim 1, characterized in that: the orifices of the first drilling hole (7), the second drilling hole (8) and the third drilling hole (9) are sealed by sleeves, the diameter of each sleeve is matched with the diameter of the drilling hole, the diameter of each sleeve is 75-110 mm, the length of each sleeve is not less than 10m, the sealing depth is not less than 8m, and the sleeve is 0.1-0.3 m higher than the orifices.
8. The high-position high-suction roadway and downward borehole extraction lower protective layer gas structure according to claim 1, characterized in that: and the high-position high-pumping roadway (6) is constructed at a position which is not less than 10m above a top plate of the protected layer (2).
9. The high-position high-suction roadway and downward borehole extraction lower protective layer gas structure according to claim 1, characterized in that: the high-level high-suction roadway (6) has staggered protective layer working face tracks along 40-60m in the horizontal direction.
10. The process for constructing the high-position high-extraction roadway and downward drilling lower protective layer gas extraction structure according to any one of claims 1 to 9, is characterized in that: the method comprises the following steps:
s1 construction roadway
The construction protective layer working face is cut into holes (3), a return air gateway (4), a sealing-tape machine gateway (5) and a high-level high-suction roadway (6);
s2, drilling
Drilling downwards from the high-position high-suction roadway (6), starting to construct a 1 st group of drilled holes from the position of the high-position high-suction roadway (6) corresponding to the position of the protective layer working face cutting hole (3) along the advancing direction of the working face by 5-10m, and constructing 1 group of drilled holes from the high-position high-suction roadway (6) at intervals of 20-40m along the advancing direction of the working face;
each set of boreholes is classified into 3 categories, including:
the first drill hole (7) can extract gas in an O-shaped ring of a mining-induced fracture near the goaf return air gateway (4) of the working face of the protective layer (1);
the second drill hole (8) can be used for extracting pressure relief gas of the protected layer (2);
a third drill hole (9) capable of extracting gas in an O-shaped ring of a mining-induced fracture near a gate way (5) of the sealing-tape machine of the goaf on the working face of the protective layer (1);
the first drill hole (7), the second drill hole (8) and the third drill hole (9) are all constructed in a caving zone of the working surface of the mined protective layer (1), and the distance between the bottoms of the drill holes in the protective layer (2) is not more than 40 m;
s3 sealing holes
The drill hole openings are sealed by adopting sleeves, the diameter of each sleeve is matched with the hole diameter of each drill hole, the diameter of each sleeve is 75-110 mm, the length of each sleeve is not less than 10m, the hole sealing depth is not less than 8m, and the height of each sleeve is 0.1-0.3 m higher than the hole opening;
s4 construction sealing wall
Constructing a sealing wall from the outer opening of the high-position high-level pumping roadway (6) to seal the high-position high-level pumping roadway (6), wherein all drill holes in the roadway are open before the construction of the sealing wall, and an extraction pipeline is not required to be connected, and the extraction pipeline (11) and a drainage pipeline are buried in the sealing wall;
s5, gas extraction and drainage
Connecting the outer extraction pipeline (11) of the closed wall with an extraction device to extract gas;
and connecting the outer drainage pipeline of the closed wall with a drainage device for drainage.
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