CN114673502A - Multi-mode disaster chain type treatment method based on bottom plate rock roadway - Google Patents
Multi-mode disaster chain type treatment method based on bottom plate rock roadway Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 73
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- 239000003245 coal Substances 0.000 claims abstract description 218
- 230000005641 tunneling Effects 0.000 claims abstract description 60
- 238000000605 extraction Methods 0.000 claims abstract description 42
- 238000005553 drilling Methods 0.000 claims abstract description 38
- 238000009412 basement excavation Methods 0.000 claims abstract description 4
- 238000004080 punching Methods 0.000 claims description 21
- 238000010276 construction Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 14
- 238000005728 strengthening Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 238000005065 mining Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 3
- 239000000701 coagulant Substances 0.000 claims description 3
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- 238000012545 processing Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000007726 management method Methods 0.000 claims 2
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 35
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
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- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention discloses a multi-mode disaster chain type treatment method based on a bottom plate rock roadway, wherein before and during tunneling of a coal roadway, pressure relief, permeability enhancement and grouting reinforcement are sequentially carried out on a target coal seam by using a cross-layer drilling hole and a grouting drilling hole, so that a reinforcement area and a pressure relief area are combined, and a reinforcement-relaxation structure formed in such a way can improve the gas extraction efficiency on one hand and can ensure the safe excavation progress and the later-stage stability maintenance of the coal roadway on the other hand; secondly, secondary extraction of abnormal occurrence gas in the coal seam can be realized by utilizing the directional drilling during stoping of the working face, and full-coverage extraction of the gas in the coal seam is realized by combining with a conventional gas extraction method of the coal seam; and finally, after the working face extraction of the current coal roadway is completed, the coal gangue produced during the tunneling of new coal roadways and bottom plate rock roadways of other continuous working faces can be filled into the currently abandoned bottom plate rock roadway, and multiple purposes of saving gangue, improving cost, protecting surface ecological environment, preventing surface subsidence and the like can be simultaneously realized.
Description
Technical Field
The invention relates to a multi-mode disaster chain type treatment method based on a bottom plate rock roadway, which is mainly suitable for practical projects of full-time and air extraction of gas in a high-gas low-permeability coal seam, efficient disposal of coal gangue and the like.
Background
The high-intensive mechanical mining mode enables coal mining to gradually extend to the deep part, the porosity and permeability of a coal bed are greatly reduced due to high ground stress, and the gas content and the gas pressure are greatly increased. In order to ensure the safe and smooth exploitation of coal seams, a series of coal seam pressure relief technologies and gas extraction methods are generally adopted to perform enhanced pressure relief extraction on pre-exploited coal seams, such as hydraulic fracturing, hydraulic punching, protective layer exploitation, bedding gas extraction, cross-bedding gas extraction and the like. The coal seam with the protective layer mining condition can adopt a protective layer mining method preferentially, and the coal seam without the protective layer mining condition controls gas disasters by means of a bottom plate rock roadway and a layer-penetrating drilling hole. Meanwhile, a large amount of coal gangue produced in the excavation process of different working faces is usually lifted to the ground from a mine for stacking, so that the operability of an underground space is ensured.
The existing floor rock roadway is usually used as a main place for gas disaster prevention and control before coal seam mining, and mainly relates to implementation of measures of cross-layer drilling gas extraction and hydraulic pressure relief and permeability improvement. The implementation of cross-layer drilling can realize the purposes of pressure relief of a coal seam and gas extraction to a certain extent, but some application limitations often exist in the actual production process: 1. the utilization efficiency of the existing bottom plate rock roadway is low, and most of the bottom plate rock roadways are designed for gas disaster modes and efficient gas extraction; 2. the hydraulic punching pressure relief means can effectively relieve the pressure of the coal seam structure, but the stability of the coal seam structure in the later coal seam tunneling process has more adverse effects; 3. for some coal seams containing complex geological structures, the pre-extraction of coal seam gas before single cross-layer drilling gas extraction cannot well reach the standard, and the continuous efficiency of working face extraction is greatly influenced; 4. after the overlying coal seam is mined, the bottom plate rock roadway is closed at present, and the larger roadway space after the closing is easy to cause stratum structure damage and surface subsidence. Meanwhile, the coal gangue stacked on the ground pollutes the ground environment, and the mixed coal blocks easy to self-ignite cause combustion accidents, thereby seriously threatening the ground production safety of mines. Therefore, it is urgently needed to provide a new method, which is one of the research directions in the industry, by considering different timeliness of the bottom plate rock roadway and respectively adopting specific means according to different stages of the bottom plate rock roadway, so that the dual effects of improving gas extraction and effective disposal of coal gangue are realized on the premise of ensuring the support stability of the bottom plate rock roadway.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a multi-mode disaster chain type treatment method based on a bottom plate rock roadway, which realizes the double effects of improving gas extraction and effective disposal of coal gangue on the premise of ensuring the support stability of the bottom plate rock roadway by respectively adopting specific means according to different stages of the bottom plate rock roadway by considering different timeliness of the bottom plate rock roadway.
In order to achieve the purpose, the invention adopts the technical scheme that: a multi-mode disaster chain type treatment method based on a bottom plate rock roadway comprises the following specific steps:
A. determining the initial position and the tunneling design path of a pre-tunneling coal roadway in a coal seam according to the condition of the coal seam, constructing a bottom plate rock roadway in a bottom plate rock stratum below the coal seam before tunneling the coal roadway, then drilling a plurality of cross-layer drill holes from a top plate of the bottom plate rock roadway to the same coal seam section, wherein the parts of the plurality of cross-layer drill holes in the same coal seam section are uniformly distributed on two sides of the initial position of the pre-tunneling coal roadway, and all the cross-layer drill holes penetrate through a target coal seam and enter the top plate rock stratum;
B. arranging hydraulic punching equipment in a bottom plate rock roadway, sequentially injecting high-pressure water into each cross-layer drill hole through the hydraulic punching equipment, wherein the punching pressure is 10-15 MPa, punching out coal around the cross-layer drill hole due to the action of high-pressure water erosion, the punching completion standard of each cross-layer drill hole is determined according to the coal output of each cross-layer drill hole, after the hydraulic punching of each cross-layer drill hole is finished, a pressure relief area is formed in each coal seam on two sides of the pre-excavation coal roadway, then, hole sealing is carried out on each cross-layer drill hole, each cross-layer drill hole is connected to a gas extraction pipeline through a pipeline for gas extraction, and the subsequent coal roadway can be conveniently excavated in the coal seam;
C. b, according to the coal roadway position and the tunneling design path determined in the step A, starting coal roadway tunneling, drilling a plurality of cross-layer drill holes from the top plate of the bottom plate rock roadway to the current coal seam section at set intervals according to the trend of the bottom plate rock roadway in the coal roadway tunneling process, and repeating the processing process in the step B to complete the arrangement of pressure relief areas on two sides of the coal roadway in tunneling; meanwhile, after a plurality of cross-layer drill holes are drilled each time, a plurality of grouting drill holes are constructed from the bottom plate rock roadway to the current coal seam section, each grouting drill hole is positioned around the coal roadway in tunneling, grouting materials are injected into each grouting drill hole by adopting grouting equipment, after the grouting materials are solidified, a strengthening area is formed around the coal roadway of the current coal seam section, and the strengthening area is closer to the coal roadway relative to the pressure relief area; then, a plurality of anchor rods are arranged from the inside of the coal roadway to the surrounding coal seam for supporting, so that a strengthening area and anchor rod supporting combined action are formed at set intervals, the overall stability during the coal roadway tunneling period is ensured until the whole coal roadway tunneling work is completed;
D. after the coal roadway tunneling work is finished, coal seam working face extraction is started, a plurality of directional drill holes are constructed from the bottom plate rock roadway to the coal body 30m in front of the coal seam working face in the extraction period, all the directional drill holes penetrate through the coal seam and enter the top plate rock stratum, and then all the directional drill holes are processed in the mode of the step B and secondary gas enhanced extraction is carried out, so that the safety and stability in the coal seam working face extraction process are guaranteed;
E. and after the mining of the working face of the current coal seam is finished, repeating the steps A to D, and after the same coal seam is separated from the current coal roadway by a certain distance, determining a new coal roadway and a bottom plate rock roadway, transporting coal gangue generated during the tunneling of the new coal roadway and the bottom plate rock roadway into the current bottom plate rock roadway for wet sealing filling, and simultaneously utilizing a currently formed pressure relief area during the tunneling of the new coal roadway, so that the tunneling efficiency of the coal roadway is improved on the premise of ensuring the safe and stable tunneling and subsequent use of the coal roadway.
And further, the coal output in the step B is obtained by multiplying the length of the cross-layer drill hole in the coal seam by the coal output per meter, wherein the coal output per meter is 1.5 t/m-3 t/m. Different layer-penetrating drill holes can have respective punching finishing standards through the judgment standard, so that the construction efficiency is effectively improved on the premise of realizing the pressure relief effect.
Further, the forming range of the strengthening area is 15-20 m away from the coal roadway; the forming range of the pressure relief area is 120-150 m away from the coal roadway. By adopting the set range, the construction quantity of various drill holes can be effectively reduced and the construction efficiency can be improved on the premise of ensuring the respective functions of a strengthening area and a pressure relief area in the process of coal roadway tunneling and the stoping of a later working face.
Further, the final hole positions of the cross-layer drilling hole, the grouting drilling hole and the directional drilling hole are all at least 1m into the roof rock stratum. This ensures the stability of the drilled holes.
Furthermore, all cross-layer drill holes on the same coal seam section are distributed in a fan shape along the coal seam, and the included angle between every two adjacent cross-layer drill holes on each side of the coal roadway is 30 degrees; the diameter of each cross-layer drill hole is 80-100 mm; the diameter of the grouting drill hole is 50-80 mm, and the diameter of the directional drill hole is 50-80 mm.
Furthermore, the construction form of directional drilling adopts the combined construction of high-position drilling and sequential drilling. The mode can better improve the gas extraction effect.
Further, the grouting material adopts cement mortar doped with a rapid coagulant, and the water cement ratio is 1: and 3, grouting equipment adopts a pneumatic grouting pump to perform grouting, and grouting time is controlled to be 30-40 min. The reinforcing strength of the reinforced area is better by adopting the grouting material.
Compared with the prior art, the invention considers the integration of three projects of gas comprehensive treatment, coal roadway rapid tunneling and stabilization and coal gangue on-site filling under different time effects of the bottom plate rock roadway, comprehensively considers the continuity of coal roadway mining and gas extraction on a time scale, improves the implementation efficiency of three-in-one of coal seam mining, gas treatment and gangue filling on a space scale, and improves the gas disaster prevention and control of a pre-mined coal seam and the in-situ disposal efficiency of coal gangue on other continuous working faces to the maximum extent on the basis of improving the utilization efficiency of the bottom plate rock roadway. Firstly, before and during tunneling of a coal roadway, pressure relief, permeability increase and grouting reinforcement are sequentially performed on a target coal seam by using a cross-layer drilling hole and a grouting drilling hole, so that a mode of combining a reinforcement area and a pressure relief area is formed around the coal roadway, wherein the reinforcement area is closer to the coal roadway, and the pressure relief area is positioned at two sides of the reinforcement area; secondly, secondary extraction of abnormally-occurring gas in the target coal seam can be realized by utilizing the directional drilling during stoping of the working face, and the full-coverage extraction of the gas in the coal seam is realized by combining with a conventional gas extraction method of the coal seam; finally, after the working face extraction of the current coal roadway is completed, the coal gangue produced when other continuous working faces are subjected to new coal roadway and bottom plate rock roadway tunneling can be filled into the currently abandoned bottom plate rock roadway, and multiple purposes of saving gangue, improving cost, protecting surface ecological environment, preventing surface subsidence and the like can be achieved; and the pressure relief area formed at present can be partially utilized when a new coal road is tunneled, so that the construction process is reduced and the tunneling efficiency of the coal road is improved on the premise of ensuring the safety and stability of the coal road tunneling and the subsequent use.
Drawings
FIG. 1 is a schematic view of the treatment construction of a coal roadway and a floor rock roadway according to the present invention;
FIG. 2 is a schematic view of a reinforcing section of the anchor rod during the driving of the coal roadway in FIG. 1;
FIG. 3 is a schematic cross-sectional view of the directional borehole spatial arrangement of FIG. 1;
FIG. 4 is a schematic diagram of the construction of the invention for treating multiple coal roadways and floor rock roadways.
In the figure: 1-coal bed; 2-bottom plate rock lane; 3-roof strata; 4-grouting and drilling; 5-drilling through layers; 6-coal road; 7-anchor rod; 8, directional drilling; i-a strengthening region; II-pressure relief area; III-in situ region.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1, the method comprises the following specific steps:
A. determining the initial position and the tunneling design path of a pre-tunneling coal roadway 6 in a coal seam 1 according to the condition of the coal seam 1, constructing a bottom plate rock roadway 2 in a bottom plate rock stratum below the coal seam 1 before tunneling the coal roadway 6 after the tunneling is finished, then drilling a plurality of cross-layer drill holes 5 from a top plate of the bottom plate rock roadway 2 to the same coal seam section, wherein the parts of the plurality of cross-layer drill holes 5 in the same coal seam section are uniformly distributed on two sides of the initial position of the pre-tunneling coal roadway 6, and all the cross-layer drill holes 5 penetrate through a target coal seam 1 and enter a top plate rock stratum 3; each cross-layer drill hole 5 on the same coal seam section is distributed in a fan shape along the coal seam inclination, and the included angle between each adjacent cross-layer drill hole 5 on each side of the coal roadway 6 is 30 degrees; the diameter of each cross-layer drill hole 5 is 80-100 mm;
B. arranging hydraulic punching equipment in the bottom plate rock roadway 2, sequentially injecting high-pressure water into each cross drilling hole 5 through the hydraulic punching equipment, wherein the punching pressure is 10-15 MPa, coal bodies around the cross drilling holes 5 are punched out under the action of high-pressure water erosion, the punching completion standard of each cross drilling hole 5 is determined by the coal output of each cross drilling hole 5, the coal output is obtained by multiplying the length of the cross drilling hole 5 in the coal bed 1 by the coal output per meter, and the coal output per meter is 1.5 t/m-3 t/m. The different cross-layer drill holes 5 can have respective punching end standards through the judgment standard, so that the construction efficiency is effectively improved on the premise of realizing the pressure relief effect; after hydraulic punching of each cross-layer drill hole 5 is finished, forming a pressure relief area II in each coal seam 1 on two sides of the pre-tunneling coal roadway 6, then sealing each cross-layer drill hole 5, connecting each cross-layer drill hole 5 to a gas extraction pipeline through a pipeline for gas extraction, and facilitating tunneling of the subsequent coal roadway 6 in the coal seam 1;
C. b, starting to tunnel the coal roadway 6 according to the position of the coal roadway 6 determined in the step A and a tunneling design path, drilling a plurality of cross-layer drill holes 5 from the top plate of the bottom plate rock roadway 2 to the current coal seam section at set intervals according to the trend of the bottom plate rock roadway 2 in the tunneling process of the coal roadway 6, and repeating the processing process in the step B to complete the arrangement of pressure relief areas II at two sides of the coal roadway 6 in tunneling; meanwhile, after a plurality of cross-layer drill holes 5 are drilled each time, a plurality of grouting drill holes 4 are constructed from the floor rock roadway 2 to the current coal seam section, the diameter of each grouting drill hole 4 is 50-80 mm, each grouting drill hole 4 is located around the coal roadway 6 in the tunneling process, grouting materials are injected into each grouting drill hole 4 through grouting equipment, after the grouting materials are solidified, a strengthening area I is formed around the coal roadway 6 of the current coal seam section, and the strengthening area I is closer to the coal roadway 6 relative to the pressure relief area II; as shown in fig. 2, a plurality of anchor rods 7 are then arranged from the inside of the coal roadway 6 to the surrounding coal seam 1 for supporting, so that a strengthening region I is formed at set intervals and the anchor rods 7 support the combined action, thereby ensuring the overall stability of the coal roadway 6 during the tunneling process until the tunneling work of the whole coal roadway 6 is completed; wherein the formation range of the strengthening area I is 15-20 m away from the coal roadway; the forming range of the pressure relief area II is 120-150 m away from the coal roadway. By adopting the set range, the construction quantity of various drill holes can be effectively reduced and the construction efficiency can be improved on the premise of ensuring the respective functions of the strengthening area I and the pressure relief area II in the process of tunneling the coal roadway 6 and stoping the working face at the later stage;
D. after the tunneling work of the coal roadway 6 is completed, the stoping of the working face of the coal seam is started, as shown in fig. 3, a plurality of directional drill holes 8 are constructed from the bottom plate rock roadway 2 to the coal body 30m in front of the working face of the coal seam during the stoping, the diameter of each directional drill hole 8 is 50-80 mm, and the construction mode of each directional drill hole 8 adopts the combined construction of high-position drilling and sequential drilling. The mode can better improve the gas extraction effect; b, all the directional drill holes 8 penetrate through the coal seam 1 and enter the roof rock stratum 3, and then all the directional drill holes 8 are treated in the mode of the step B and then secondary gas enhanced extraction is carried out, so that safety and stability in the stoping process of the coal seam working face are guaranteed; the final hole positions of the cross-layer drill hole 5, the grouting drill hole 4 and the directional drill hole 8 enter the roof strata by at least 1 m. This ensures the stability of the drilled holes.
E. After the mining of the working face of the current coal seam is finished, repeating the steps A to D, and after the same coal seam is separated from the current coal roadway by a certain distance, determining a new coal roadway 6 and a bottom plate rock roadway 2 as shown in fig. 4, transporting coal gangue generated during the tunneling of the new coal roadway 6 and the bottom plate rock roadway 2 into the current bottom plate rock roadway 2 for wet sealing filling, and simultaneously utilizing a currently formed pressure relief area II during the tunneling of the new coal roadway 6, so that the tunneling efficiency of the coal roadway 6 is improved on the premise of ensuring the safe and stable tunneling and subsequent use of the coal roadway 6. The wet sealing filling process comprises the following steps: filling high-water material mixed coal gangue into the bottom plate rock roadway 2, and arranging a buried pipe to perform negative pressure extraction on air in a filling area; the injection pressure of the high-water material is 3-5 MPa, the injection volume is obtained by subtracting the filling volume of the coal gangue from the volume of the bottom plate rock roadway 2, and the air negative pressure extraction pressure is 700-900 kPa.
As an improvement of the invention, the grouting material adopts cement mortar doped with a rapid coagulant, and the water cement ratio is 1: and 3, grouting equipment adopts a pneumatic grouting pump to perform grouting, and grouting time is controlled to be 30-40 min. The reinforcing strength of the reinforcing area I is better by adopting the grouting material.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (7)
1. A multi-mode disaster chain type treatment method based on a bottom plate rock roadway is characterized by comprising the following specific steps:
A. determining the initial position and the tunneling design path of a pre-tunneling coal roadway in a coal seam according to the coal seam condition, constructing a bottom rock roadway in a bottom rock stratum below the coal seam before tunneling the coal roadway, then drilling a plurality of cross-layer drill holes from a top plate of the bottom rock roadway to the same coal seam section, uniformly distributing parts of the plurality of cross-layer drill holes in the same coal seam section on two sides of the initial position of the pre-tunneling coal roadway, and enabling all the cross-layer drill holes to penetrate through a target coal seam and enter the top rock stratum;
B. arranging hydraulic punching equipment in a bottom plate rock roadway, sequentially injecting high-pressure water into each cross-layer drill hole through the hydraulic punching equipment, wherein the punching pressure is 10-15 MPa, punching out coal around the cross-layer drill hole due to the action of high-pressure water erosion, the punching completion standard of each cross-layer drill hole is determined according to the coal output of each cross-layer drill hole, after the hydraulic punching of each cross-layer drill hole is finished, a pressure relief area is formed in each coal seam on two sides of the pre-excavation coal roadway, then, hole sealing is carried out on each cross-layer drill hole, each cross-layer drill hole is connected to a gas extraction pipeline through a pipeline for gas extraction, and the subsequent coal roadway can be conveniently excavated in the coal seam;
C. b, according to the coal roadway position and the tunneling design path determined in the step A, starting coal roadway tunneling, drilling a plurality of cross-layer drill holes from the top plate of the bottom plate rock roadway to the current coal seam section at set intervals according to the trend of the bottom plate rock roadway in the coal roadway tunneling process, and repeating the processing process in the step B to complete the arrangement of pressure relief areas on two sides of the coal roadway in tunneling; meanwhile, after a plurality of cross-layer drill holes are drilled each time, a plurality of grouting drill holes are constructed from the floor rock roadway to the current coal seam section, each grouting drill hole is positioned around the coal roadway in tunneling, grouting materials are injected into each grouting drill hole by adopting grouting equipment, after the grouting materials are solidified, a strengthening area is formed around the coal roadway of the current coal seam section, and the strengthening area is closer to the coal roadway relative to the pressure relief area; then, a plurality of anchor rods are arranged from the inside of the coal roadway to the surrounding coal seam for supporting, so that a strengthening area and anchor rod supporting combined action are formed at set intervals, the overall stability during the coal roadway tunneling period is ensured until the whole coal roadway tunneling work is completed;
D. after the coal roadway tunneling work is finished, coal seam working face extraction is started, a plurality of directional drill holes are constructed from the bottom plate rock roadway to the coal body 30m in front of the coal seam working face in the extraction period, all the directional drill holes penetrate through the coal seam and enter the top plate rock stratum, and then all the directional drill holes are processed in the mode of the step B and secondary gas enhanced extraction is carried out, so that the safety and stability in the coal seam working face extraction process are guaranteed;
E. and after the mining of the working face of the current coal seam is finished, repeating the steps A to D, and after the same coal seam is separated from the current coal roadway by a certain distance, determining a new coal roadway and a bottom plate rock roadway, transporting coal gangue generated during the tunneling of the new coal roadway and the bottom plate rock roadway into the current bottom plate rock roadway for wet sealing filling, and simultaneously utilizing a currently formed pressure relief area during the tunneling of the new coal roadway, so that the tunneling efficiency of the coal roadway is improved on the premise of ensuring the safe and stable tunneling and subsequent use of the coal roadway.
2. The method as claimed in claim 1, wherein the coal output in step B is obtained by multiplying the length of the cross drilled hole in the coal seam by the coal output per meter, wherein the coal output per meter is 1.5 t/m-3 t/m.
3. The method for multi-mode disaster chain management based on the floor rock roadway according to claim 1, wherein the formation range of the strengthened area is 15-20 m away from the coal roadway; the forming range of the pressure relief area is 120-150 m away from the coal roadway.
4. The method of claim 1, wherein the final hole positions of the cross-layer drilling hole, the grouting drilling hole and the directional drilling hole are at least 1m into the roof rock stratum.
5. The multimode disaster chain management method based on the floor rock roadway is characterized in that the cross-layer drill holes on the same coal seam section are distributed in a fan shape along the coal seam trend, and the included angle between the adjacent cross-layer drill holes on each side of the coal roadway is 30 degrees; the diameter of each cross-layer drill hole is 80-100 mm; the diameter of the grouting drill hole is 50-80 mm, and the diameter of the directional drill hole is 50-80 mm.
6. The method for multi-mode disaster chain control based on the floor rock roadway, according to claim 1, is characterized in that the construction form of directional drilling adopts combined construction of high-position drilling and in-layer drilling.
7. The method as claimed in claim 1, wherein the grouting material is cement mortar doped with a fast coagulant, and the water cement ratio is 1: and 3, grouting equipment adopts a pneumatic grouting pump to perform grouting, and grouting time is controlled to be 30-40 min.
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| CN115199269A (en) * | 2022-07-08 | 2022-10-18 | 中国矿业大学 | Multi-disaster integrated prevention and control method for island outburst coal seam strong and weak coupling structure |
Citations (9)
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| CN112664259A (en) * | 2020-12-23 | 2021-04-16 | 中国矿业大学 | Trinity comprehensive outburst prevention method for high outburst coal seam |
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| CN102409997A (en) * | 2011-12-09 | 2012-04-11 | 中国矿业大学 | Curtain grouting anti-burst method for cutting through coal and gas bursting seam in shaft |
| CN102900460A (en) * | 2012-11-06 | 2013-01-30 | 中国矿业大学 | Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam |
| CN103362538A (en) * | 2013-07-15 | 2013-10-23 | 中国矿业大学 | Coal seam cutting, fracturing, pressure pumping and alternating gas extraction method |
| CN104314610A (en) * | 2014-10-11 | 2015-01-28 | 中煤科工集团重庆研究院有限公司 | Coal road stripe region burst-preventing method |
| CN104863629A (en) * | 2015-06-11 | 2015-08-26 | 中国矿业大学 | Method for extracting gas from separation layer below overlying strata, draining water and grouting through combined drill hole |
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| CN109113784A (en) * | 2018-09-20 | 2019-01-01 | 中国矿业大学 | A kind of coal bed gas extraction-water filling coupling device and method |
| CN112145225A (en) * | 2020-09-22 | 2020-12-29 | 中煤能源研究院有限责任公司 | Underground in-situ pulping and backfilling system and method for coal mine tunneling gangue |
| CN112664259A (en) * | 2020-12-23 | 2021-04-16 | 中国矿业大学 | Trinity comprehensive outburst prevention method for high outburst coal seam |
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| CN115199269A (en) * | 2022-07-08 | 2022-10-18 | 中国矿业大学 | Multi-disaster integrated prevention and control method for island outburst coal seam strong and weak coupling structure |
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