CN109026133B - Extraction method of pressure-relief gas in mining separation zone of super-long working face - Google Patents

Extraction method of pressure-relief gas in mining separation zone of super-long working face Download PDF

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CN109026133B
CN109026133B CN201811156383.6A CN201811156383A CN109026133B CN 109026133 B CN109026133 B CN 109026133B CN 201811156383 A CN201811156383 A CN 201811156383A CN 109026133 B CN109026133 B CN 109026133B
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extraction
working
roadway
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mining
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CN109026133A (en
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陈建国
范凯
毛薪杰
卢运海
陈占全
何立菊
汪胜
唐道春
陈忠明
欧居全
赵康华
郭靖
郭煜
向华
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SICHUAN HUAYINGSHAN LONGTAN COAL CO Ltd
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SICHUAN HUAYINGSHAN LONGTAN COAL CO Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F1/00Ventilation of mines or tunnels; Distribution of ventilating currents
    • E21F1/006Ventilation at the working face of galleries or tunnels

Abstract

The invention discloses a method for extracting pressure-relief gas in a mining separation zone of an ultra-long working face, which is used for treating gas at an upper corner and a goaf and comprises the following steps: three recovery roadways of an upper forward, a middle forward and a lower forward are arranged aiming at the overlong working face to form a W-shaped ventilation system of an upper forward air inlet, a lower forward air inlet and a middle forward air return; arranging a high-position extraction drill hole and a high-position extraction roadway at the middle upper part in the O-shaped ring at the upper part of the overlying rock of the middle along goaf, and then performing stoping; and connecting the arranged high-position extraction holes and the high-position drainage roadway to extraction branch pipes, and merging the extraction branch pipes into a mine gas extraction utilization system for extraction treatment. The extraction method can efficiently extract and utilize high-concentration gas in the separation layer pressure relief fracture zone of the worked-out section, reduce the gas emission amount of the worked-out section of the working face, avoid the accidents of return air of the working face, gas overrun of an upper corner and gas explosion of the worked-out section, improve the production efficiency and safety of the working face and ensure the safe stoping of a mine.

Description

Extraction method of pressure-relief gas in mining separation zone of super-long working face
Technical Field
The invention belongs to the technical field of goaf gas treatment, and particularly relates to a method for extracting pressure-relief gas in a goaf separation zone of an ultralong working face.
Background
The Longtan mine is a modern mine newly built in the southwest region, and in order to improve the yield of a working face and realize high yield and high efficiency, the customary inclined length of 150m of the Huafu mountain mining area of the working face with the Sessilekuwa route is adjusted to be 200-240 m; the trend length of 600m is adjusted to 800-1600m, and a large-reserve fully-mechanized coal mining face mining pattern is formed. The adjustment of thought brings certain difficulty for the gas control of the stope face of the mine, particularly in the aspect of gas control of a goaf and an upper corner, the potential safety hazard is obvious, and the following problems are mainly exposed:
firstly, due to the increase of the inclination length and the trend length of the working face, the area of a goaf is increased in the stoping and advancing process, and when the roof is not well collapsed and managed, a large gas accumulation space is easily formed;
secondly, the bottom plate crack gas and the overlying K2 coal seam develop on the working face of the south wing of the mine, and under the action of mine pressure after recovery, high-concentration bottom plate crack gas and a large amount of remained K2 coal seams are easily conducted in the goaf, so that a gas emission source in the goaf is increased, and the gas emission amount is large;
and thirdly, the fully mechanized mining face adopts U-shaped ventilation, and an air path at an upper corner is often in a vortex state and is not smooth in ventilation, so that gas accumulation is easily caused. If the gas emission control in the goaf is not proper enough, the production stop of the working face is caused if the gas emission control is not proper enough, and a gas explosion accident can be caused if the gas emission control is serious.
Disclosure of Invention
The invention aims to provide a method for extracting pressure-relief gas in a mining separation zone of an ultra-long working face, which can effectively solve the problems of gas overrun at an upper corner and gas overrun of return air flow, control the gas at the upper corner and in a goaf of a fully mechanized mining face, realize extraction and utilization of high-concentration gas in the goaf and improve the safety and production efficiency of the fully mechanized mining face.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a method for extracting pressure relief gas in a mining separation zone of an ultralong working face comprises the following steps:
(1) three recovery roadways of an upper gateway, a middle gateway and a lower gateway are arranged aiming at the overlong working face to form a W-shaped ventilation system with upper and lower forward air inlets and middle forward air return;
(2) arranging a high-position extraction roadway and an extraction drill hole at the pressure relief fracture belt position above the middle crossheading and in the O-shaped ring, and performing extraction;
the method comprises the following steps that pressure relief gas extraction drill holes and a high-position extraction roadway in a goaf are arranged in a stage-by-stage mode along the treatment trend of a working face, the first stage is an extraction treatment stage of overlapping and lapping upward from an oblique direction to the high-position extraction drill holes, the treatment trend is 1/4 with the long trend of the working face, and the extraction drill holes are arranged in a top plate of a crossheading roadway in the working face; the second stage is a horizontal strike high-position drill hole extraction treatment stage, wherein the extraction drill holes are arranged in the front of the high-position extraction roadway, the high-position extraction roadway is horizontally away from a return air gate and is vertically away from a working face mining layer top plate, and the construction strike length is 2/4 with the working face strike length; the third stage is a heading high-position extraction roadway extraction treatment stage;
(3) sealing the high-position extraction drill hole, adopting a 'two-plug one-injection' under-pressure hole sealing process, arranging plugs before and after the drill hole to form a sealed under-pressure grouting chamber, injecting the proportioned expandable cement slurry into the sealed under-pressure grouting chamber to perform under-pressure filling and sealing, and blocking a connecting channel between a screen pipe extraction area and a surrounding rock gas leakage crack in the hole, wherein the hole sealing depth of the high-position extraction drill hole is not less than 30 m;
(4) laying extraction branch pipes with the inner diameters of the pipelines not smaller than DN200mm in a middle crossheading and a high-position extraction roadway of return air of a working face, arranging inspection nozzles and gate valves on the extraction branch pipes, connecting the arranged high-position extraction drill holes and the high-position extraction roadway to the extraction branch pipes, and then merging the extraction branch pipes into a mine gas extraction system for extraction and utilization of pressure-relief gas in a mining and separation zone;
(5) in the first stage, after the high-position extraction drill hole is stoped and pushed for a certain distance on a working face, the high-position extraction drill hole is thrown and extracted, and the high-position extraction drill hole is connected into an extraction branch pipe laid in the middle gate way for extraction and utilization; in the second stage, the high-position extraction drill hole is fed and extracted after the working face is stoped and pushed to the direction of 1/4 of the high-position extraction drill hole, and the high-position extraction drill hole is connected into an extraction branch pipe laid in a high-position extraction roadway for extraction and utilization; and in the third stage, the high-position extraction roadway is subjected to extraction and pumping after the working face is subjected to extraction and is pushed to the direction of 2/4 to be long, a seal is constructed at a position which is not more than 5m near the full negative pressure ventilation of the high-position extraction roadway, and a pumping and releasing branch pipe is reserved in the high-position extraction roadway for roadway pumping.
Preferably, in the step (1), the inclined length of the working surface of the overlong working surface is more than or equal to 240 m; the air return quantity of the middle crossheading is the sum of the air distribution quantities of the air intake of the upper crossheading and the air intake of the lower crossheading; the air distribution quantity of the air supplied to the upper and lower crossheading is 800-1000 m3Min, wherein the return air volume of the middle gate is 1600-2000 m3/min。
Preferably, in step (2), the extraction borehole arrangement of the first stage is: the drill holes are arranged in groups, the number of each group is not less than 4, the distance between every two groups is 40m, the drill hole construction diameter is not less than 94mm, the drill hole construction inclination angle is 20-30 degrees, the construction hole depth is 60-70 m, the drill hole position of the final hole is at the position of the fissure zone and is 20-30 m away from the direction of the coal seam roof.
Preferably, in step (2), the extraction borehole of the second stage is arranged: at least 8 drill holes are arranged, the drill hole construction inclination angle is 1 degree, the hole diameter is not less than 113mm, the hole depth is 1/4 with the long working face trend, and the drill hole position is consistent with the high-position extraction roadway.
Preferably, in the step (2), the second stage of high-level extraction roadway layout comprises: the horizontal distance between the high-level extraction roadway and the return air is 6-10 m, and the vertical distance between the high-level extraction roadway and the mining layer roof is 20-30 m.
Preferably, the drainage layer of the fractured zone in the step (2) is located at a working surface mining height layer which is 10-15 times of the height of the fractured zone.
Preferably, in the step (3), the prepared expandable cement slurry is injected into the sealed under-pressure grouting chamber by using a hole sealing pump for under-pressure filling and plugging; the hole sealing pump is a mechanical hole sealing pump which is a BFK-12/2.4 type mining hole sealing pump, and the maximum vertical distance of slurry conveying capacity is 50 m.
Preferably, in the step (3), the cement slurry ratio is that the ratio of portland cement: water: the weight ratio of the gypsum powder is 2.5: 1: 0.2 configuration.
Preferably, in the step (4), the mine gas extraction system is a ground permanent extraction utilization system, two water ring vacuum pumps are installed in the system, and the maximum extraction amount is 324m3The rated power is 400kw, the pipe diameter of a main pipeline of the extraction system is DN500mm, and the pipe diameter of a main pipeline of the mining area is DN350 mm.
Preferably, in the step (5), the first stage high-level extraction drill hole is cast after the working face is stoped and pushed for 30 m.
The invention has the beneficial effects that: according to the extraction method provided by the invention, the ultra-long working face is adjusted to be a W-shaped ventilation system, and the extraction project is arranged in the double O-shaped rings of the mining separation layer to extract pressure-relief gas, so that the safety technical problems of poor gas extraction effect of the goaf, frequent overrun of upper corner and return gas and great safety threat under the U-shaped ventilation system of the traditional working face are solved, the gas emission amount of the goaf of the working face can be reduced, the accidents of overrun of return gas of the working face and corner gas and gas explosion of the goaf are avoided, the production efficiency and safety of the working face are improved, and the safe mining of a mine is ensured. The method has the following advantages:
1. the working face is ventilated in a W shape, the upper and lower crossroads are provided with air, and the ventilation system does not have the problem of gas accumulation at the upper corner, so that the problem that the gas at the upper corner exceeds the limit is fundamentally solved;
2. the drill hole and the extraction roadway are arranged in a pressure relief fracture zone of a covering rock separation layer at the middle and upper part, and the extraction roadway is arranged in a W shape, so that a double O-shaped ring superposed zone is formed at the upper part of the mining side of the covering rock at the middle and upper part after mining on a working face, the pressure relief and permeability increase range is enlarged, and the gas in a high-concentration goaf can be well extracted, so that the gas in the goaf can be efficiently extracted and treated; the concentration of the gas which can be extracted by the method can reach more than 20-60%;
3. the roadway arrangement mode of the W-shaped ventilation of the working face is more favorable for the arrangement of pre-drainage holes of the coal seam before mining of the working face, and the arrangement of bedding pre-drainage holes in the upper, middle and lower crossheading is favorable for preventing the phenomenon of pre-drainage white belt during drilling disaster control, thereby creating conditions for the achievement of pre-drainage standards before mining of the working face;
4, the roadway arrangement mode of W-shaped ventilation can set the return airway of the working face as an independent return airway, thereby avoiding arranging fully-mechanized mining related electrical equipment in the return airway, avoiding the problem that return air dust endangers the health of workers and being beneficial to the management of ventilation gas of the working face;
5. the extraction project adopts an arrangement mode of combining the high-extraction drill hole and the high-position extraction and discharge roadway, so that a large part of high-extraction roadway disaster control project amount is integrally saved, and the safety and economic benefits are realized;
6. the method has simple process, obvious technical advantages and popularization and application prospects.
Drawings
Fig. 1 is a schematic structural diagram of a W-shaped ventilation system, an extraction borehole and an extraction roadway arranged by the extraction method in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. 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.
A method for extracting pressure relief gas in a mining separation zone of an ultralong working face comprises the following steps:
(1) three recovery roadways of an upper gateway, a middle gateway and a lower gateway are arranged aiming at the overlong working face to form a W-shaped ventilation system with upper and lower forward air inlets and middle forward air return;
(2) arranging a high-position extraction roadway and an extraction drill hole at the pressure relief fracture belt position above the middle crossheading and in the O-shaped ring, and performing extraction;
the method comprises the following steps that pressure relief gas extraction drill holes and a high-position extraction roadway in a goaf are arranged in a stage-by-stage mode along the treatment trend of a working face, the first stage is an extraction treatment stage of overlapping and lapping upward from an oblique direction to the high-position extraction drill holes, the treatment trend is 1/4 with the long trend of the working face, and the extraction drill holes are arranged in a top plate of a crossheading roadway in the working face; the second stage is a horizontal strike high-position drill hole extraction treatment stage, wherein the extraction drill holes are arranged in the front of the high-position extraction roadway, the high-position extraction roadway is horizontally away from a return air gate and is vertically away from a working face mining layer top plate, and the construction strike length is 2/4 with the working face strike length; the third stage is a heading high-position extraction roadway extraction treatment stage;
(3) sealing the high-position extraction drill hole, adopting a 'two-plug one-injection' under-pressure hole sealing process, arranging plugs before and after the drill hole to form a sealed under-pressure grouting chamber, injecting the proportioned expandable cement slurry into the sealed under-pressure grouting chamber to perform under-pressure filling and sealing, and blocking a connecting channel between a screen pipe extraction area and a surrounding rock gas leakage crack in the hole, wherein the hole sealing depth of the high-position extraction drill hole is not less than 30 m;
(4) laying extraction branch pipes with the inner diameters of the pipelines not smaller than DN200mm (DN, nominal diameter) in a middle crossheading and a high-position extraction roadway of return air of a working face, arranging inspection mouths and gate valves on the extraction branch pipes, connecting the arranged high-position extraction drill holes and the high-position extraction roadway into the extraction branch pipes, and then merging the extraction branch pipes into a mine gas extraction system for pressure-relief gas extraction utilization in a mining and separation zone;
(5) in the first stage, the high-position extraction drill hole is thrown and extracted after the working face is stoped and pushed for a certain distance, and the high-position extraction drill hole is connected into an extraction branch pipe laid in the middle gate way for extraction and utilization; in the second stage, the high-position extraction drill hole is fed and extracted after the working face is stoped and pushed to the direction of 1/4, and the high-position extraction drill hole is connected into an extraction branch pipe laid in a high-position extraction roadway for extraction and utilization; and in the third stage, the high-position extraction roadway is subjected to extraction and pumping after the working face is subjected to extraction and is pushed to the direction of 2/4 to be long, a seal is constructed at a position which is not more than 5m near the full negative pressure ventilation of the high-position extraction roadway, and a pumping and releasing branch pipe is reserved in the high-position extraction roadway for roadway pumping.
Further, in step (ii)(1) In the middle, the inclined length of the working surface of the overlong working surface is more than or equal to 240 m; the air distribution volume of the working face is calculated according to the gas control requirement, and the return air volume of the middle crossheading is the sum of the air distribution volumes of the air intake of the upper crossheading and the air intake of the lower crossheading; the air distribution quantity of the air supplied to the upper and lower crossheading is 800-1000 m3The air return amount of the middle gate groove is 1600-2000 m3/min。
Further, in step (2), the extraction borehole of the first stage is arranged: the drill holes are arranged in groups, the number of each group is not less than 4, the distance between every two groups is 40m, the drill hole construction diameter is not less than 94mm, the drill hole construction inclination angle is 20-30 degrees, the construction hole depth is 60-70 m, the drill hole position of the final hole is at the position of the fissure zone and is 20-30 m away from the direction of the coal seam roof. The diameter of the drilled hole is limited to be more than 94mm, the larger the aperture is, the larger the single-hole extraction flow is, and the better the extraction and drainage treatment effect is. Setting the inclination angle, the depth and the group distance of drilling construction: on one hand, the method is used for constructing the drill hole (upward inclined overlapped and lapped to a high-position extraction drill hole) to a pressure relief fracture zone layer for extracting the gas in the high-concentration goaf; on the other hand, along with the continuous extraction and propulsion of the working face, the extraction range of the fractured zone of the similar drill holes gradually decreases, and as the similar drill holes are arranged in groups at certain intervals, the extraction effect of the previous group of drill holes is deteriorated, and meanwhile, the next group of drill holes are immediately continued to extract at the horizon of the fractured zone, so that the treatment effect is ensured.
Further, in step (2), the extraction borehole of the second stage is arranged: at least 8 drill holes are arranged, the drill hole construction inclination angle is 1 degree, the hole diameter is not less than 113mm, the hole depth is 1/4 with the long working face trend, and the drill hole position is consistent with the high-position extraction roadway. The high-power drilling machine with the model ZDY4000S or ZDY6000S can be used for drilling, and the high-power drilling machine can provide working efficiency. And in the second stage, the horizontal direction is towards the long and long drilling, and the inclination angle of the drilling construction is required to be kept at about 1 degree with the high roadway extraction construction level. Because the high suction lane is arranged at the fissure zone level, the drill hole is horizontally constructed along the moraine heading and is always kept at the fissure zone level, and if the inclination angle construction is overlarge, the drill hole deviates from the fissure zone level to influence the drainage treatment effect. The longer the drilling construction depth (namely the hole depth) is, the better the pumping and discharging treatment time at the stage is, the more the work process quantity of the high pumping roadway can be optimized and reduced, and the general horizontal direction high-length drilling construction depth is not less than 200 m.
Further, in the step (2), arranging a second stage of high-level extraction roadway: the horizontal distance between the high-level extraction roadway and the return air is 6-10 m, and the vertical distance between the high-level extraction roadway and the mining layer roof is 20-30 m. The selection of the arrangement layer of the high-position extraction roadway directly influences the quality of the gas drainage effect of the goaf, and the general high-position extraction roadway needs to be arranged at the layer of the fractured zone.
Further, the drainage layer of the fracture zone in the step (2) is located at a working face mining height layer which is 10-15 times of the height of the fracture zone. After the high-position extraction roadway and the extraction drill hole are constructed to the position, gas in the worked-out section can be well drained and treated.
Further, in the step (3), injecting the prepared expandable cement slurry into a sealed under-pressure grouting chamber by using a hole sealing pump to perform under-pressure filling and plugging; the hole sealing pump is a mechanical hole sealing pump which is a BFK-12/2.4 type mining hole sealing pump, and the maximum vertical distance of slurry conveying capacity is 50 m.
Further, in the step (3), the cement slurry ratio is as follows: water: the weight ratio of the gypsum powder is 2.5: 1: 0.2 configuration.
Further, in the step (4), the mine gas extraction system is a ground permanent extraction utilization system, two water ring vacuum pumps are installed in the system, and the maximum extraction amount is 324m3The rated power is 400kw, the pipe diameter of a main pipeline of the extraction system is DN500mm, and the pipe diameter of a main pipeline of the mining area is DN350 mm.
Further, in the step (5), the high-position extraction drill hole in the first stage is fed and extracted after the working face is stoped and pushed for 30 m.
In order to more specifically explain the method for extracting the pressure relief gas in the mining separation zone of the overlong working face, which is provided by the invention, the following detailed description is given by combining the attached drawings and the embodiment 1.
Example 1
For the scheme of gas treatment of the upper corner of the large-reserve ultra-long fully mechanized mining working face and the goaf, the arrangement mode of a stoping roadway of the working face is adjusted, the traditional U-shaped ventilation mode is adjusted into the W-shaped ventilation mode, and gas extraction and utilization of the goaf are carried out by means of extraction drill holes and extraction roadways arranged in a mining separation layer pressure relief annular fracture ring, so that the purpose of safe, green and efficient gas treatment of the upper corner of the working face and the goaf is achieved.
As shown in fig. 1, a schematic structural diagram of a W-shaped ventilation system, an extraction drill hole, and an extraction roadway (in the figure, 10 is a goaf and 20 is a compaction area) arranged by the extraction method in embodiment 1 of the present invention is shown, and in order to ensure a treatment effect, the specific implementation includes:
s1: three recovery roadways of an upper gateway (1), a middle gateway (2) and a lower gateway (3) are arranged aiming at an ultra-long working face to form a W-shaped ventilation system with upper and lower forward air inlets and middle forward air return, wherein the upper and lower forward air inlets are respectively matched with 1000m air volume3Min, medium and smooth return air volume 2000m3/min;
S2: before stoping, arranging a high-position extraction roadway (4) and an extraction drill hole (5) above the middle gate way (2) in advance, and ensuring that the arranged position is at the middle upper part of a pressure relief fracture zone in the O-shaped ring so as to carry out stoping;
the method comprises the steps of firstly, arranging pressure-relief gas extraction drill holes and a high-position extraction roadway (4) in a goaf in a stage-by-stage mode along the treatment trend of a working face, wherein in the first stage, the pressure-relief gas extraction drill holes and the high-position extraction roadway are overlapped and lapped upwards in an inclined-upward mode to reach the extraction treatment stage of the high-position extraction drill holes, the treatment trend is 1/4 which is long as the trend of the working face, the extraction drill holes (5) are arranged in a roadway top plate of a gate (2) in the working face, the drill holes are arranged in groups, the number of each group is not less than 4, the interval of each group is 40m, the construction diameter of each drill hole is not less than 94mm, the construction dip angle of each drill hole is 20-30 degrees; the second stage is a horizontal strike high-position long drill hole extraction treatment stage, extraction drill holes (5) are arranged in the front of the strike high-position extraction roadway (4), construction is carried out by adopting a ZDY4000S or ZDY6000S type high-power drilling machine, at least 8 drill holes are arranged, the inclination angle of the drill hole construction is 1 DEG, the hole diameter is not less than 113mm, the hole depth is 1/4 with long working face strike, and the drill hole position is consistent with the high-position extraction roadway (4); 2/4 that the high-position extraction roadway (4) is horizontally 6-10 m away from the high wall of the return air chute (2), 20-30 m away from the mining layer top plate of the working face vertically, and the construction trend is longer than that of the working face; the third stage is a high-position drainage roadway extraction and treatment stage, wherein after the high-position drainage roadway extraction and treatment stage is entered, a seal is constructed at a position which is not more than 5m near the full negative pressure ventilation of the high-position drainage roadway (4) in advance, and an extraction pipeline is reserved for roadway extraction;
s3: the technical requirements of high-position extraction drilling and hole sealing are as follows:
firstly, adopting a 'two-plugging one-injecting' pressurized hole sealing process, arranging plugs before and after drilling to form a sealed pressurized grouting chamber, injecting proportioned expandable cement slurry into the sealed pressurized grouting chamber by using a mechanical hole sealing pump to perform pressurized filling and sealing, and blocking a connection channel between a screen pipe extraction area and surrounding rock gas leakage cracks in a hole;
secondly, a BFK-12/2.4 type mining hole sealing pump is selected as the hole sealing pump, and the maximum vertical distance of slurry conveying capacity is 50 m;
proportioning cement slurry, and mixing portland cement: water: the weight ratio of the gypsum powder is 2.5: 1: 0.2 configuration;
(III) the hole sealing depth of the high-position extraction drill hole is not less than 30 m;
s4: PVC extraction branch pipes with the inner diameters of the pipelines not smaller than DN200mm are laid in the working face return air and the high-position extraction roadway (4), the extraction branch pipes are provided with inspection nozzles and gate valves, the arranged high-position extraction drill holes and the high-position extraction roadway (4) are connected to the extraction branch pipes, and then the extraction branch pipes are merged into a mine gas extraction system to extract and utilize pressure-relief gas in an extraction and separation area;
s5: in the first stage, the high-position extraction drilling throwing time is that after the working face is stoped and pushed for 30m, the drilling is connected into an extraction branch pipe laid in the middle gate way (2) for extraction and utilization; in the second stage, the throwing and extracting time of the high-position extraction drill hole is that after the working face is stoped and pushed to the direction of 1/4 to be long, the drill hole is connected into an extraction branch pipe (6) laid in the high-position extraction roadway (4) for extraction and utilization; and in the third stage, the throwing and pumping time of the high-position extraction roadway (4) is that after the working face is stoped and pushed to 2/4 to be long, a sealing wall (7) is constructed at a position which is not more than 5m near the full negative pressure ventilation of the high-position extraction roadway (4), and a pumping branch pipe is reserved in the roadway for roadway pumping.
Finally, it should be noted that: 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. A method for extracting pressure relief gas in a mining separation zone of an ultralong working face is characterized by comprising the following steps:
(1) three recovery roadways of an upper gateway, a middle gateway and a lower gateway are arranged aiming at the overlong working face to form a W-shaped ventilation system for air inlet of the upper gateway and the lower gateway and air return of the middle gateway;
(2) arranging a high-position extraction roadway and an extraction drill hole at the pressure relief fracture belt position above the middle crossheading and in the O-shaped ring, and performing extraction;
the method comprises the following steps that pressure relief gas extraction drill holes and a high-position extraction roadway in a goaf are arranged in a stage-by-stage mode along the treatment trend of a working face, the first stage is an extraction treatment stage of overlapping and lapping upward from an oblique direction and towards the high-position extraction drill holes, the treatment trend is 1/4 with the long trend of the working face, and the extraction drill holes in the first stage are arranged in a top plate of a roadway in the working face; the second stage is a horizontal strike high-position long drill hole extraction treatment stage, the second stage extraction drill hole is arranged in the high-position extraction roadway tillite head, the high-position extraction roadway is horizontally away from a return air gate groove and is vertically away from a working face mining layer top plate, and the construction strike length is 2/4 with the working face strike length; the third stage is a high-position extraction roadway extraction treatment stage;
(3) sealing the high-position extraction drill hole, adopting a 'two-plug one-injection' under-pressure hole sealing process, arranging plugs before and after the drill hole to form a sealed under-pressure grouting chamber, injecting the proportioned expandable cement slurry into the sealed under-pressure grouting chamber to perform under-pressure filling and sealing, and blocking a connecting channel between a screen pipe extraction area and a surrounding rock gas leakage crack in the hole, wherein the hole sealing depth of the high-position extraction drill hole is not less than 30 m;
(4) laying extraction branch pipes with the inner diameters of the pipelines not smaller than DN200mm in a middle crossheading and a high-position extraction roadway of return air of a working face, arranging inspection nozzles and gate valves on the extraction branch pipes, connecting the arranged high-position extraction drill holes and the high-position extraction roadway to the extraction branch pipes, and then merging the extraction branch pipes into a mine gas extraction system for extraction and utilization of pressure-relief gas in a mining and separation zone;
(5) the high-position extraction drill hole in the first stage is fed and extracted after the working face is stoped and pushed for a certain distance, and the high-position extraction drill hole in the first stage is connected into the extraction branch pipe laid in the middle gate way for extraction and utilization; the second-stage high-position extraction drill hole is fed and extracted after the working face is stoped and pushed to the direction of 1/4 of the working face to be long, and the second-stage high-position extraction drill hole is connected into an extraction branch pipe laid in a high-position extraction roadway for extraction and utilization; and in the third stage, the high-position extraction drill hole is subjected to extraction at the working face and is pushed to the 2/4 trend length, then the high-position extraction drill hole is cast and extracted, the position which is not more than 5m near the full negative pressure ventilation of the high-position extraction roadway is sealed, and a drainage branch pipe is reserved in the high-position extraction roadway for roadway extraction.
2. The extraction method of the pressure-relief gas in the mining separation zone of the overlong working face according to claim 1, characterized in that in the step (1), the inclined length of the working face of the overlong working face is more than or equal to 240 m; the air return quantity of the middle crossheading is the sum of the air distribution quantities of the air intake of the upper crossheading and the air intake of the lower crossheading; the air distribution quantity of the air supplied to the upper and lower crossheading is 800-1000 m3Min, wherein the return air volume of the middle gate is 1600-2000 m3/min。
3. The extraction method of pressure relief gas in the overlength working face mining separation zone according to claim 1, wherein in the step (2), the extraction drill hole in the first stage is arranged: the drill holes are arranged in groups, the number of each group is not less than 4, the distance between every two groups is 40m, the drill hole construction diameter is not less than 94mm, the drill hole construction inclination angle is 20-30 degrees, the construction hole depth is 60-70 m, and the position of the final drill hole is at the position of a fissure zone and is 20-30 m away from the direction of a coal seam roof.
4. The extraction method of pressure relief gas in the overlength working face mining separation zone according to claim 1, wherein in the step (2), the second-stage extraction drill hole is arranged: at least 8 drill holes are arranged, the drill hole construction inclination angle is 1 degree, the hole diameter is not less than 113mm, the hole depth is 1/4 with the long working face trend, and the drill hole position is consistent with the high-position extraction roadway.
5. The extraction method of the pressure-relief gas in the mining separation zone of the overlong working face according to claim 1, characterized in that in the step (2), the second-stage high-level extraction roadway is arranged: the horizontal distance between the high-level extraction roadway and the return air is 6-10 m, and the vertical distance between the high-level extraction roadway and the mining layer roof is 20-30 m.
6. The extraction method of the pressure-relief gas in the mining and separation zone of the overlong working face according to claim 1, wherein the drainage layer of the fracture zone in the step (2) is 10-15 times of the mining height layer of the working face.
7. The extraction method of the pressure relief gas in the mining and separation zone of the overlong working face according to claim 1, characterized in that in the step (3), the prepared expansive cement slurry is injected into a sealed under-pressure grouting chamber by a hole sealing pump to perform under-pressure filling and plugging; the hole sealing pump is a mechanical hole sealing pump which is a BFK-12/2.4 type mining hole sealing pump, and the maximum vertical distance of slurry conveying capacity is 50 m.
8. The extraction method of the pressure relief gas in the mining separation zone of the overlong working face according to claim 1, wherein in the step (3), the cement slurry is prepared from portland cement: water: the weight ratio of the gypsum powder is 2.5: 1: 0.2 of proportioning configuration.
9. The extraction method of the pressure-relief gas in the mining separation zone of the overlong working face according to claim 1, wherein in the step (4), the mine gas extraction system is a ground permanent extraction utilization system which is provided with two water ring vacuum pumps, and the maximum extraction rate is 324m3The rated power is 400kw, the pipe diameter of a main pipeline of the extraction system is DN500mm, and the pipe diameter of a main pipeline of the mining area is DN350 mm.
10. The extraction method of the pressure-relief gas in the mining and separation zone of the overlong working face according to claim 1, characterized in that in the step (5), the high-level extraction drill hole in the first stage is thrown and extracted after the working face is stoped and pushed for 30 m.
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