CN115012936A - Pressure relief and danger relieving method for coal mine TBM during tunneling and coal penetration - Google Patents
Pressure relief and danger relieving method for coal mine TBM during tunneling and coal penetration Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 175
- 230000005641 tunneling Effects 0.000 title claims abstract description 22
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- 230000035515 penetration Effects 0.000 title claims abstract description 9
- 238000005422 blasting Methods 0.000 claims abstract description 49
- 238000005192 partition Methods 0.000 claims abstract description 22
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 239000002360 explosive Substances 0.000 claims description 4
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- 238000005065 mining Methods 0.000 claims description 3
- 230000000116 mitigating effect Effects 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 6
- 238000009412 basement excavation Methods 0.000 description 8
- 239000011435 rock Substances 0.000 description 8
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- 238000002360 preparation method Methods 0.000 description 1
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- 239000002893 slag Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
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- 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
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/11—Making by using boring or cutting machines with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
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Abstract
The invention discloses a pressure relief and danger relieving method during coal mine TBM (tunnel boring and coal penetration) periods, which comprises the steps of determining the gradient of the trend of a coal-penetrating roadway, and determining the length of the coal-penetrating roadway in a bottom coal reserving area; then, equally dividing the length of the coal road into c subareas, and acquiring an inclination angle between a penetrated coal seam and a horizontal plane; the thickness range of the bottom coal below each partition bottom plate can be obtained according to a formula; then, a tunnel is tunneled by adopting a TBM (tunnel boring machine), when the position of an operation platform of the TBM enters a coal tunnel of a bottom coal remaining area, a group of side part blasting hole groups are symmetrically constructed on two sides of the coal tunnel on the operation platform for blasting pressure relief, then, side part blasting pressure relief is carried out once every time the TBM tunnels for a certain distance, and finally, side part pressure relief work is realized; after the TBM completely passes through the coal roadway of the bottom coal remaining area, according to the thickness range of bottom coal below the bottom plate of each subarea roadway, a large-diameter drilling mode or a bottom plate blast hole mode is adopted according to the situation, so that roadway side pressure relief and bottom plate pressure relief are implemented in stages during the coal tunneling and penetrating of the TBM.
Description
Technical Field
The invention relates to a pressure relief and danger relieving method for a TBM (tunnel boring machine) of a coal mine during coal penetration, belonging to the technical field of coal mine safety.
Background
In the process of coal mining, in order to form a complete production system, various development roadways, preparation roadways and recovery roadways need to be excavated, wherein blasting excavation and fully mechanized excavation are commonly used as excavation methods. The blasting excavation has the advantages that the process is mature, but the defects that as the large-area blasting of explosives is adopted for excavation, the safety links are more, the restriction conditions are more, and the labor intensity of personnel is high; the fully mechanized excavation uses the tunneling machine for tunneling, and the matched transfer machine and the belt conveyor are used for transporting coal and rock, so that the labor intensity of personnel is low, the tunneling efficiency is high, and the progress is fast, so that the fully mechanized excavation is widely applied to coal mines in recent years. With the increasing mining intensity of mines, the tunneling speed of roadways, particularly rock roadways, becomes an important factor for restricting the high yield and high efficiency of mines. The current roadway driving mode can not meet the mine requirements. The TBM (i.e. a full-face hard rock tunnel boring machine) is the most advanced tunnel construction machine at present, can realize parallel continuous operation in the construction procedures of boring, supporting, slag tapping and the like, has the advantages of high boring speed, environmental protection, high comprehensive benefit and the like, and is gradually applied to underground coal mine tunnel boring. In some coal mines with complicated coal seam occurrence conditions, a coal-rock layer penetrating phenomenon of a roadway often exists in the tunneling process of the roadway. Previous researches show that stress distribution is uneven due to lithological differences in coal-rock boundary areas, stress concentration phenomena exist, dynamic disasters such as rock burst are prone to occurring, and therefore targeted pressure relief and danger relieving measures need to be taken in a roadway coal penetrating area to reduce impact risks and improve roadway stability; at present, when a heading machine is used for heading, pressure relief drilling is carried out at the head position of a coal mine, so that pressure relief and danger relief measures are carried out; however, when the TBM is used for tunneling, the machine body is long, and a drilling machine cannot enter, so that the conventional pressure relief danger relieving measures cannot be implemented at the head-on position, and how to provide a pressure relief danger relieving method with a good effect during the coal tunneling and coal penetration period of the TBM is a research direction of the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a pressure relief and danger elimination method during the coal mine TBM roadway driving and coal penetration period, which can perform staged roadway side pressure relief and floor pressure relief during the TBM roadway driving and coal penetration period, and can perform floor pressure relief correspondingly in different modes according to the thickness of floor coal in different areas, thereby realizing better pressure relief and danger elimination effects.
In order to achieve the purpose, the invention adopts the technical scheme that: a pressure relief and danger relieving method for a coal mine TBM during tunneling and coal penetration comprises the following specific steps:
(1) firstly, according to the scheme of roadway excavation, determining the gradient alpha between the strike direction of the coal-passing roadway and the horizontal plane L Determining the length L of the coal roadway of the coal-penetrating roadway in the bottom coal remaining area; equally dividing the length L of the coal roadway of the bottom coal remaining area into c subareas, wherein the length of each subarea is L b Then obtaining the inclination angle alpha between the penetrated coal seam and the horizontal plane, setting the section where the bottom of the coal seam is connected with the roadway bottom plate as 1 section, and the thickness of the bottom coal below the roadway bottom plates at two ends of the section is h L0 And h L1 And h is L0 Sequentially marking each subarea along the coal roadway direction, wherein the thickness of bottom coal below roadway bottom plates at two ends of the nth subarea is h L(n-1) And h Ln Then, the following formula is used for calculation:
h Ln ＝nL b tan(α L +α)
wherein n is more than or equal to 1 and less than or equal to c; thereby obtaining the thickness range of the bottom coal below the bottom plate of the nth subarea roadway as h L(n-1) ～h Ln ；
(2) Adopting a TBM (tunnel boring machine) to carry out tunnel boring, stopping boring when an operation platform of the TBM enters a coal roadway of a bottom coal remaining area, and constructing a group of side part blasting hole groups on the operation platform to the sides of the coal roadway symmetrically, wherein each group of side part blasting hole groups is provided with two blasting holes, and the blasting holes of the two groups of side part blasting hole groups are positioned on the same vertical plane of the coal roadway; each group of upperThe included angle between two blast holes of the part blast hole group in the vertical plane is alpha 1 The aperture is phi 1 Depth of hole is h 1 The medicine loading per hole is m 1 Completing the laying of one-time side blasting holes, blasting and pressure relief, then continuing tunneling along a coal roadway by the TBM, stopping tunneling every time the TBM tunnels for 5-10 m in the coal roadway of the bottom coal remaining area, repeating the steps at the current position to complete one-time side blasting and pressure relief, and continuously circulating in the way until the TBM passes through the coal roadway of the bottom coal remaining area to complete the blasting and pressure relief work of all sides;
(3) after the TBM completely passes through the coal roadway of the reserved bottom coal area, carrying out bottom plate pressure relief on each subarea of the coal roadway of the reserved bottom coal area, and entering the step (4) if the minimum thickness of bottom coal below the current subarea bottom plate is less than or equal to 2m according to the thickness range of the bottom coal below the bottom plate of each subarea roadway obtained in the step (1), or entering the step (5) until the pressure relief of the bottom plates of all subareas is finished, so that the pressure relief and danger relief process during the coal mine TBM roadway digging and coal penetrating is realized;
(4) carrying out bottom plate pressure relief on the current subarea by adopting large-diameter drill holes, arranging a plurality of groups of large-diameter drill hole groups on the bottom plate of the current subarea at intervals along the coal roadway trend, wherein the distance between every two adjacent drill hole groups is not more than 2m, each group of large-diameter drill hole groups is composed of three large-diameter drill holes, and the aperture of each of the three large-diameter drill holes is phi 2 (ii) a Three large-diameter drill holes are positioned in the same coal roadway vertical plane, wherein two large-diameter drill holes are respectively distributed from the partition bottom plate to two bottom angles of the roadway, and the included angle between the two large-diameter drill holes in the vertical plane is alpha 2 The other large-diameter drill hole is vertically and downwards distributed from the partition bottom plate, and the deepest part of the three large-diameter drill holes penetrates out of the bottom coal area below the current partition bottom plate in each direction, so that the pressure relief work of the current partition bottom plate is completed;
(5) carrying out bottom plate pressure relief on the current partition by adopting bottom plate blast holes, arranging a plurality of bottom plate blast hole groups on the bottom plate of the current partition along the coal roadway trend at intervals, wherein the distance between adjacent drill hole groups is 5-10 m, each bottom plate blast hole group consists of three bottom plate blast holes, and the aperture of each of the three bottom plate blast holes is phi 3 (ii) a Three bottom plate blast holes are positioned in the same coal roadway vertical plane and are arranged in the same coal roadway vertical planeThe two middle bottom plate blasting holes are respectively arranged from the partition bottom plate to two bottom angles of the roadway, and the included angle between the two bottom plate blasting holes in the vertical plane is alpha 2 The other bottom plate blast hole is vertically arranged downwards from the subarea bottom plate, the deepest part of the three bottom plate blast holes penetrates out of the bottom coal area below the current subarea bottom plate in each direction, and the explosive loading of each hole is m 2 And then blasting and pressure relief are carried out on each bottom plate blasting hole group in sequence, so that the pressure relief work of the bottom plate of the current subarea is completed.
Further, α in the step (2) 1 Is 0 to 45 degrees; phi is a 1 40-50 mm; h is 1 8-12 m; m is a unit of 1 1-4 kg.
Further, phi in said steps (4) and (5) 2 Is 110-150 mm; alpha (alpha) ("alpha") 2 60 degrees to 120 degrees; phi is a 3 Is 40 to 50 mm.
Further, in the step (5), if the minimum thickness of the bottom coal below the current partition bottom plate is within the range of more than 2m and less than or equal to 5m, then m is 2 100-200 g; if the minimum thickness of the bottom coal below the current subarea bottom plate is within the range of more than 5m and less than or equal to 10m, m 2 500-600 g; if the minimum thickness of the bottom coal below the bottom plate of the current subarea is more than 10m, m is 2 1.5-2 kg.
Compared with the prior art, the method determines the gradient alpha between the coal-passing roadway trend and the horizontal plane L Determining the length L of the coal roadway of the coal-penetrating roadway in the bottom coal remaining area; then, equally dividing the length L of the coal roadway into c subareas, and acquiring an inclination angle alpha between a penetrated coal seam and a horizontal plane; the thickness range of bottom coal below the bottom plate of each partition roadway can be obtained according to a set formula; secondly, tunneling a tunnel by adopting a TBM (tunnel boring machine), stopping tunneling when the position of an operation platform of the TBM enters a coal tunnel of a bottom coal remaining area, symmetrically constructing a group of side part blasting hole groups on two sides of the coal tunnel on the operation platform, setting construction parameters, blasting and pressure relief, and then performing side part blasting and pressure relief once every 5-10 m of tunneling by the TBM to finally realize side part pressure relief; after the TBM completely passes through the coal roadway of the bottom coal remaining area, according to the thickness range of bottom coal below the bottom plate of each subarea roadway, if the bottom coal below the bottom plate of the current subarea roadway is in the thickness range of the bottom coal below the bottom plate of the current subarea roadwayThe minimum thickness of coal is less than or equal to 2m, a large-diameter drilling mode is adopted, if the minimum thickness of the coal is greater than 2m, a bottom plate blast hole mode is adopted, and construction parameters are set according to three conditions of the thickness of the coal bed in the bottom plate blast hole mode respectively, so that roadway side pressure relief and bottom plate pressure relief are implemented in stages during the roadway driving and coal penetrating period of the TBM, and different modes are correspondingly adopted for carrying out bottom plate pressure relief according to the thickness of bottom coal in different areas, so that the mode can not only ensure that coal and rock bodies cannot be greatly vibrated during pressure relief, improve the stability during tunneling, but also ensure the pressure relief and danger relieving effects during the roadway driving and coal penetrating period of the TBM due to the interaction of the multiple pressure relief modes, and greatly reduce the possibility of dynamic disasters such as rock burst and the like.
Drawings
FIG. 1 is a schematic diagram of the calculation of the thickness of the bottom coal during the TBM tunneling through the coal in the present invention;
FIG. 2 is a schematic diagram of the arrangement of upper blasthole sets in the present invention;
FIG. 3 is a schematic illustration of the present invention arrangement for pressure relief of a baseplate using large diameter drillings;
fig. 4 is a schematic diagram of the arrangement of the present invention for floor pressure relief using floor blastholes.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1, the method comprises the following specific steps:
(1) firstly, according to the scheme of roadway driving, determining the gradient alpha between the coal-passing roadway trend and the horizontal plane L Determining the length L of the coal roadway of the coal-penetrating roadway in the bottom coal remaining area; equally dividing the coal roadway length L of the bottom coal remaining region into c subareas, wherein the length of each subarea is L b Then obtaining the inclination angle alpha between the penetrated coal seam and the horizontal plane, setting the section where the bottom of the coal seam is connected with the roadway bottom plate as 1 section, and the thickness of the bottom coal below the roadway bottom plates at two ends of the section is h L0 And h L1 And h is L0 Sequentially marking each subarea along the coal roadway direction, wherein the thickness of bottom coal below roadway bottom plates at two ends of the nth subarea is h L(n-1) And h Ln Followed byThe following formula is calculated:
h Ln ＝nL b tan(α L +α)
wherein n is more than or equal to 1 and less than or equal to c; thereby obtaining the thickness range of the bottom coal below the bottom plate of the nth subarea roadway as h L(n-1) ～h Ln ；
(2) Adopting a TBM (tunnel boring machine) to carry out tunnel boring, stopping boring when an operation platform of the TBM enters a coal roadway of a bottom coal remaining area, and constructing a group of side part blasting hole groups on the operation platform symmetrically to two sides of the coal roadway respectively at the moment, wherein each group of side part blasting hole group is provided with two blasting holes, and the blasting holes of the two groups of side part blasting hole groups are positioned on the same vertical plane of the coal roadway; the included angle between two blast holes of each group of side part blast hole groups in the vertical plane is alpha 1 The aperture is phi 1 Depth of hole is h 1 The medicine loading per hole is m 1 In which α is 1 Is 0 to 45 degrees; phi is a 1 40-50 mm; h is 1 8-12 m; m is 1 1-4 kg; completing the laying of one-time side blasting holes, blasting and relieving pressure, then continuing tunneling along a coal roadway by the TBM, stopping tunneling every time the TBM tunnels for 5-10 m in the coal roadway of the bottom coal remaining area, repeating the steps at the current position to complete one-time side blasting and pressure relief, and continuously circulating in the way until the TBM passes through the coal roadway of the bottom coal remaining area to complete the blasting and pressure relief work of all sides;
(3) after the TBM completely passes through the coal roadway of the reserved bottom coal area, carrying out bottom plate pressure relief on each subarea of the coal roadway of the reserved bottom coal area, and entering the step (4) if the minimum thickness of bottom coal below the current subarea bottom plate is less than or equal to 2m according to the thickness range of the bottom coal below the bottom plate of each subarea roadway obtained in the step (1), or entering the step (5) until the pressure relief of the bottom plates of all subareas is finished, so that the pressure relief and danger relief process during the coal mine TBM roadway digging and coal penetrating is realized;
(4) as shown in fig. 3, large-diameter drill holes are adopted to perform bottom plate pressure relief on the current subarea, a plurality of groups of large-diameter drill hole groups are arranged on the bottom plate of the current subarea at intervals along the coal roadway direction, the distance between adjacent drill hole groups is not more than 2m, each group of large-diameter drill hole groups is composed of three large-diameter drill holes, and the aperture of each of the three large-diameter drill holes is phi 2 (ii) a Three major diametersThe drill holes are positioned in the same coal roadway vertical plane, wherein two large-diameter drill holes are respectively arranged from the partition bottom plate to two bottom angles of the roadway, and the included angle between the two large-diameter drill holes in the vertical plane is alpha 2 The other large-diameter drill hole is vertically and downwards distributed from the partition bottom plate, and the deepest part of the three large-diameter drill holes penetrates out of the bottom coal area below the current partition bottom plate in each direction, so that the pressure relief work of the current partition bottom plate is completed; wherein phi is 2 110-150 mm; alpha is alpha 2 60 degrees to 120 degrees;
(5) as shown in fig. 4, bottom plate blasting holes are adopted to perform bottom plate pressure relief on the current subarea, a plurality of groups of bottom plate blasting hole groups are arranged on the bottom plate of the current subarea at intervals along the coal roadway direction, the distance between adjacent drilling hole groups is 5-10 m, each group of bottom plate blasting hole groups consists of three bottom plate blasting holes, and the aperture of each of the three bottom plate blasting holes is phi 3 (ii) a Three bottom plate blast holes are positioned in the same coal roadway vertical plane, wherein two bottom plate blast holes are respectively distributed from the partition bottom plate towards two bottom angles of the roadway, and the included angle between the two bottom plate blast holes in the vertical plane is alpha 2 The other bottom plate blast hole is vertically arranged downwards from the subarea bottom plate, the deepest part of the three bottom plate blast holes penetrates out of the bottom coal area below the current subarea bottom plate in each direction, and the explosive loading of each hole is m 2 Then, blasting and pressure relief are carried out on each bottom plate blasting hole group in sequence, so that the pressure relief work of the bottom plate of the current subarea is completed; wherein alpha is 2 60 degrees to 120 degrees; phi is a 3 40-50 mm; if the minimum thickness of the bottom coal below the current subarea bottom plate is in the range of more than 2m and less than or equal to 5m, m is 2 100-200 g; if the minimum thickness of the bottom coal below the current subarea bottom plate is in the range of more than 5m and less than or equal to 10m, m is 2 500-600 g; if the minimum thickness of the bottom coal below the bottom plate of the current subarea is more than 10m, m is 2 1.5-2 kg.
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 (4)
1. A pressure relief and danger relieving method for a coal mine TBM during roadway driving and coal penetration is characterized by comprising the following specific steps:
(1) firstly, according to the scheme of roadway driving, determining the gradient alpha between the coal-passing roadway trend and the horizontal plane L Determining the length L of the coal roadway of the coal-penetrating roadway in the bottom coal remaining area; equally dividing the coal roadway length L of the bottom coal remaining region into c subareas, wherein the length of each subarea is L b Then obtaining the inclination angle alpha between the penetrated coal seam and the horizontal plane, setting the section where the bottom of the coal seam is connected with the roadway bottom plate as 1 section, and the thickness of the bottom coal below the roadway bottom plates at two ends of the section is h L0 And h L1 And h is L0 Sequentially marking each subarea along the coal roadway direction, wherein the thickness of bottom coal below roadway bottom plates at two ends of the nth subarea is h L(n-1) And h Ln Then, the following formula is used for calculation:
h Ln ＝nL b tan(α L +α)
wherein n is more than or equal to 1 and less than or equal to c; thereby obtaining the thickness range of the bottom coal below the bottom plate of the nth subarea roadway as h L(n-1) ～h Ln ；
(2) Adopting a TBM (tunnel boring machine) to carry out tunnel boring, stopping boring when an operation platform of the TBM enters a coal roadway of a bottom coal remaining area, and constructing a group of side part blasting hole groups on the operation platform to the sides of the coal roadway symmetrically, wherein each group of side part blasting hole groups is provided with two blasting holes, and the blasting holes of the two groups of side part blasting hole groups are positioned on the same vertical plane of the coal roadway; the included angle between two blast holes of each group of side part blast hole groups in the vertical plane is alpha 1 The aperture is phi 1 Depth of hole is h 1 The medicine loading per hole is m 1 Completing the laying of one-time side blasting holes, blasting and pressure relief, then continuing tunneling along a coal roadway by the TBM, stopping tunneling every time the TBM tunnels for 5-10 m in the coal roadway of the bottom coal remaining area, repeating the steps at the current position to complete one-time side blasting and pressure relief, and continuously circulating in the way until the TBM passes through the coal roadway of the bottom coal remaining area to complete the blasting and pressure relief work of all sides;
(3) after the TBM completely passes through the coal roadway of the reserved bottom coal area, carrying out bottom plate pressure relief on each subarea of the coal roadway of the reserved bottom coal area, and entering the step (4) if the minimum thickness of bottom coal below the current subarea bottom plate is less than or equal to 2m according to the thickness range of the bottom coal below the bottom plate of each subarea roadway obtained in the step (1), or entering the step (5) until the pressure relief of the bottom plates of all subareas is finished, so that the pressure relief and danger relief process during the coal mine TBM roadway digging and coal penetrating is realized;
(4) carrying out bottom plate pressure relief on the current subarea by adopting large-diameter drill holes, arranging a plurality of groups of large-diameter drill hole groups on the bottom plate of the current subarea at intervals along the coal roadway trend, wherein the distance between every two adjacent drill hole groups is not more than 2m, each group of large-diameter drill hole groups is composed of three large-diameter drill holes, and the aperture of each of the three large-diameter drill holes is phi 2 (ii) a Three large-diameter drill holes are positioned in the same coal roadway vertical plane, wherein two large-diameter drill holes are respectively distributed from the partition bottom plate to two bottom angles of the roadway, and the included angle between the two large-diameter drill holes in the vertical plane is alpha 2 The other large-diameter drill hole is vertically and downwards distributed from the partition bottom plate, and the deepest part of the three large-diameter drill holes penetrates out of the bottom coal area below the current partition bottom plate in each direction, so that the pressure relief work of the current partition bottom plate is completed;
(5) carrying out bottom plate pressure relief on the current partition by adopting bottom plate blast holes, arranging a plurality of bottom plate blast hole groups on the bottom plate of the current partition along the coal roadway trend at intervals, wherein the distance between adjacent drill hole groups is 5-10 m, each bottom plate blast hole group consists of three bottom plate blast holes, and the aperture of each of the three bottom plate blast holes is phi 3 (ii) a Three bottom plate blast holes are positioned in the same coal roadway vertical plane, wherein two bottom plate blast holes are respectively distributed from the partition bottom plate towards two bottom angles of the roadway, and the included angle between the two bottom plate blast holes in the vertical plane is alpha 2 The other bottom plate blast hole is vertically arranged downwards from the subarea bottom plate, the deepest part of the three bottom plate blast holes penetrates out of the bottom coal area below the current subarea bottom plate in each direction, and the explosive loading of each hole is m 2 And then blasting and pressure relief are carried out on each bottom plate blasting hole group in sequence, so that the pressure relief work of the bottom plate of the current subarea is completed.
2. The coal according to claim 1The pressure relief danger relieving method during coal mining and tunnel-driving of the mine TBM is characterized in that alpha in the step (2) 1 Is 0 to 45 degrees; phi is a 1 40-50 mm; h is 1 8-12 m; m is 1 1-4 kg.
3. The method for pressure relief and danger mitigation during coal mine TBM roadway driving and coal penetrating of claim 1, characterized in that phi in the steps (4) and (5) 2 110-150 mm; alpha is alpha 2 60 to 120 degrees; phi is a 3 Is 40 to 50 mm.
4. The pressure relief and danger relieving method during coal mine TBM roadway driving and coal penetrating of claim 1, wherein in the step (5), if the minimum thickness of bottom coal below the floor of the current subarea is within a range of more than 2m and less than or equal to 5m, m is 2 100-200 g; if the minimum thickness of the bottom coal below the current subarea bottom plate is within the range of more than 5m and less than or equal to 10m, m 2 500-600 g; if the minimum thickness of the bottom coal below the bottom plate of the current subarea is more than 10m, m is 2 1.5-2 kg.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355008A (en) * | 2022-07-15 | 2022-11-18 | 中国矿业大学 | Three-dimensional pressure relief method during coal rock layer crossing period of rock burst mine excavation roadway |
| CN117552792A (en) * | 2024-01-10 | 2024-02-13 | 北京科技大学 | Bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect |
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| CN115355008A (en) * | 2022-07-15 | 2022-11-18 | 中国矿业大学 | Three-dimensional pressure relief method during coal rock layer crossing period of rock burst mine excavation roadway |
| CN115355008B (en) * | 2022-07-15 | 2023-09-19 | 中国矿业大学 | Three-dimensional pressure relief method during coal rock layer penetrating period of tunneling roadway of rock burst mine |
| CN117552792A (en) * | 2024-01-10 | 2024-02-13 | 北京科技大学 | Bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect |
| CN117552792B (en) * | 2024-01-10 | 2024-03-22 | 北京科技大学 | Bottom coal blasting pressure relief optimization construction method and system based on blasting disturbance effect |
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