CN115059469B - Advanced large-diameter drilling pre-pressure relief method for small coal pillar tunneling roadway - Google Patents
Advanced large-diameter drilling pre-pressure relief method for small coal pillar tunneling roadway Download PDFInfo
- Publication number
- CN115059469B CN115059469B CN202210818334.4A CN202210818334A CN115059469B CN 115059469 B CN115059469 B CN 115059469B CN 202210818334 A CN202210818334 A CN 202210818334A CN 115059469 B CN115059469 B CN 115059469B
- Authority
- CN
- China
- Prior art keywords
- roadway
- tunneling
- diameter drilling
- excavated
- pressure relief
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003245 coal Substances 0.000 title claims abstract description 75
- 238000005553 drilling Methods 0.000 title claims abstract description 73
- 230000005641 tunneling Effects 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000010276 construction Methods 0.000 claims abstract description 24
- 239000007787 solid Substances 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000005670 electromagnetic radiation Effects 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 3
- 238000012567 pattern recognition method Methods 0.000 claims 1
- 230000002265 prevention Effects 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 239000011435 rock Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses an advanced large-diameter drilling pre-pressure relief method for a small coal pillar tunneling roadway, which comprises the steps of determining the width and trend of a roadway to be drilled on one side of the small coal pillar before the formation of the small coal pillar, determining the range of an impact dangerous area and the impact dangerous level of the impact dangerous area on the path of the roadway to be drilled, starting tunneling of the roadway to be drilled at the moment, constructing large-diameter drilling perpendicular to the roadway and penetrating through the small coal pillar, the roadway to be drilled and solid coal in the impact dangerous area in the corresponding tunnel to the impact dangerous area, arranging a plurality of large-diameter drilling in a row for pressure relief treatment, and simultaneously performing tunneling and large-diameter drilling pressure relief, wherein the construction position of the large-diameter drilling and a tunneling head are kept at least 20m all the time, so that the mutual interference between the construction of the large-diameter pressure relief drilling and the tunneling of the roadway is avoided, the tunneling efficiency of the roadway to be drilled is improved, and the prevention and treatment of the impact dangerous of the roadway through the advanced pressure relief can be effectively improved.
Description
Technical Field
The invention relates to a coal mine coal seam tunneling roadway advanced pre-pressure relief method, in particular to a small coal pillar tunneling roadway advanced large-diameter drilling pre-pressure relief method.
Background
The development of coal resources in China gradually changes from eastern part to western part and from shallow part to deep part, surrounding rock stress of deep coal exploitation is continuously increased, roadway stress environment is continuously deteriorated, impact risk is increased, especially, a tunneling roadway in a coal bed becomes a dynamic disaster frequent area such as rock burst, coal and gas outburst and the like, and the safety production of deep mines and the life safety of personnel are seriously threatened.
In order to reduce rock burst induced by the coal pillars left between working faces, small coal pillars with the width of 4.0-8.0m are left between underground coal mining working faces of the coal mine for preventing goaf water and/or gas and the like. When the coal face is prepared in turn, the face tunnels on the two sides of the small coal pillar basically excavate one tunnel, and after the tunnel is excavated, the tunnel is excavated to the other tunnel on the small coal pillar side. And in the latter tunneling process, solid coal is arranged on one side, and a small coal pillar is arranged on the other side.
According to the safety requirement of the existing coal mine, a roadway is driven in an impact dangerous area, the advanced coal body needs to be subjected to pre-pressure relief, and currently, advanced construction of large-diameter drilling holes becomes a main pre-pressure relief technology of the coal seam driving roadway in the impact dangerous area. The prior process for pre-releasing the advanced coal body of the coal seam by adopting the large-diameter drilling hole comprises the following steps: the advanced pre-pressure relief of the tunneling tunnel is carried out by stopping tunneling after a certain distance is tunneled through the tunnel, constructing a plurality of large-diameter boreholes in the coal wall by using a drilling machine to vertically or obliquely cross the coal wall at a small angle at a tunneling head, tunneling is carried out after the construction is completed, and the repeated circulation is carried out to realize the pre-pressure relief process; in addition, when the tunnel is tunneled through a high impact dangerous area, large-diameter drilling holes are also constructed on two sides of the tunnel at a certain distance behind the tunnelling head in time after the coal seam tunnel is tunneled, so that the pressure of the two sides is relieved. According to the process, the existing coal seam roadway tunneling and the heading head advanced large-diameter drilling construction cannot be performed simultaneously, one side is required to stop the other side, and the two are alternately performed; and because of the influence of mechanical equipment such as a heading machine, a reversed loader, a rubber belt conveyor and the like near the heading head, the drilling machine is difficult to enter, so that the two sides of a roadway behind the heading head are difficult to construct and release pressure of a large-diameter drilling hole in time. Therefore, the existing mode not only affects the tunneling efficiency of the coal mine tunnel, but also reduces the impact danger prevention and control effect of the tunneling tunnel. Therefore, the method has a good effect on preventing and controlling the impact danger of the tunneling roadway through advanced pre-pressure relief, and can enable the advanced pre-pressure relief and the tunneling roadway to be carried out simultaneously without affecting each other, so that the tunneling efficiency of the coal seam roadway is improved, and the method is one of research directions in the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the advanced large-diameter drilling pre-pressure relief method for the small coal pillar tunneling roadway, which has a good effect on preventing and controlling the impact danger of the tunneling roadway through advanced pre-pressure relief, and can enable the advanced pre-pressure relief and the tunneling roadway to be carried out simultaneously without influencing each other, thereby improving the tunneling efficiency of the coal seam roadway.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a small coal pillar tunneling roadway advanced large-diameter drilling pre-pressure relief method specifically comprises the following steps:
A. Tunneling a roadway on one side of a small coal pillar (the small coal pillar is formed on two sides of the small coal pillar, and only when the small coal pillar is formed between the two roadways), taking the roadway as a tunneling roadway (the tunneling of the roadway is performed in the existing mode), and performing advanced and rear pressure relief on two sides of the tunneling roadway by adopting a large-diameter drilling hole;
B. The width and trend of a roadway to be excavated are predetermined on the other side of the small coal pillar, the roadway to be excavated is parallel to the excavated roadway, then the range of impact danger areas and impact danger levels existing on a preset path of the tunneled roadway are predicted by using a known impact danger prediction method, and weak, medium and strong impact danger areas are respectively defined;
C. B, tunneling the roadway according to the width and trend of the roadway to be excavated, when the distance f between the tunneling head of the roadway to be excavated and the impact danger area range determined in the step B is smaller than 40m, constructing a first large-diameter drilling hole in the roadway to be excavated at the side of the roadway close to the small coal pillar vertically in the excavated roadway at the side of the small coal pillar, enabling the large-diameter drilling hole to sequentially penetrate through the small coal pillar and the roadway to be excavated to enter solid coal of the working face to be excavated, continuously tunneling the roadway to be excavated in the construction process of the first large-diameter drilling hole, and calculating the depth d of the large-diameter drilling hole according to the following formula;
d＝a+b+c
Wherein a is the width of the small coal pillar, m; b is the width of a roadway to be excavated, m; c is the depth of the large-diameter drilling hole penetrating into the solid coal of the working face to be excavated, m is required to meet the requirement that c is more than or equal to 2b; thereby completing the construction of the first large-diameter borehole;
D. Along with continuous tunneling of a roadway to be drilled, after a first large-diameter drilling hole is constructed in the step C, a plurality of large-diameter drilling holes are arranged on the roadway side of the first large-diameter drilling hole, which is close to the small coal pillar, along the direction of the predetermined roadway to be drilled, construction parameters of the large-diameter drilling holes are the same, the distance e between the large-diameter drilling holes is determined according to the grade of the large-diameter drilling holes passing through an impact dangerous area, wherein the distance e passing through the weak impact dangerous area is e 1, the distance e 2 passing through the medium impact dangerous area is e 3; and e 1＞e2＞e3;
E. And in the process of continuous tunneling and advanced large-diameter drilling and pre-pressure relief of the roadway to be excavated, the distance between the position of each large-diameter drilling and the tunneling head in the construction process always meets g more than or equal to 20m, so that the tunneling and pressure relief process of the whole roadway to be excavated is completed.
Further, the known impact risk prediction method is one or more of a comprehensive index method, a multi-factor mode identification method, a multi-factor coupling analysis method, a shock wave CT inversion method, an electromagnetic radiation method and a mine pressure observation method.
Further, the diameter of each large-diameter drill hole is 100-200 mm, the interval e 1 is 3.0m, the interval e 2 is 2.0m, the interval e 3 is 1.0m, and the distance h between all large-diameter drill holes and the floor of the excavated roadway is 1.0-1.5 m. By adopting the parameter setting, the effect of advanced pressure relief can be effectively ensured, and the construction efficiency can be effectively improved.
Compared with the prior art, the invention firstly completes the tunneling of the tunnel at one side before the formation of the small coal pillar as the dug tunnel, and carries out coal mining work on the dug working face, after the completion, the width and trend of the tunnel to be dug are determined at the other side of the small coal pillar, then the range of the impact danger area and the impact danger level thereof on the path of the tunnel to be dug are determined through the known prediction method, at the moment, the tunneling work of the tunnel to be dug is started, when the distance between the tunnel to be dug and the determined impact danger area is smaller than 40m (the large diameter drilling construction is started in the distance, the better advanced pressure relief effect can be realized), the large diameter drilling perpendicular to the tunnel and penetrating the small coal pillar, the tunnel to be dug and the solid coal of the working face to be dug is constructed in the dug tunnel corresponding to the impact danger area, and a plurality of large diameter drilling holes are arranged in an arrangement to carry out pressure relief treatment, the distance between the large diameter holes is respectively determined according to the level that the large diameter holes pass through the impact dangerous area, in addition, the tunneling process of the to-be-excavated tunnel is continuously kept in the construction process of performing advanced pressure relief on the large diameter holes, and at least 20m is kept between the construction position of the large diameter holes and the tunneling head all the time, so that the mutual interference between the tunneling of the large diameter pressure relief holes of the tunneling tunnel and the tunneling of the tunnel is avoided, the tunneling efficiency of the to-be-excavated tunnel is improved, the influence of the impact dangerous prevention and control effect caused by the fact that the two large diameter pressure relief holes of the tunnel behind the tunneling head cannot be timely constructed due to the influence of tunneling equipment can be effectively reduced, in addition, the method can also be used for reducing the drilling machine moving times and the using time during the construction of the large diameter holes of the tunneling tunnel is performed, thereby reducing the engineering cost, and also has better economic benefit. Therefore, the method has important significance in improving the tunneling efficiency of the small coal pillar tunneling roadway in the impact dangerous area, preventing and controlling the impact danger, reducing the construction cost of large-diameter drilling and guaranteeing the efficient and safe production of the mine.
Drawings
FIG. 1 is a schematic illustration of a large diameter borehole layout of a roadway entry head approaching an impact hazard zone in accordance with the present invention;
FIG. 2 is a schematic diagram of a large diameter borehole layout of a roadway in the driving of an impact hazard zone according to the present invention;
FIG. 3 is a schematic cross-sectional view of a large diameter borehole layout in the vertical roadway side direction in accordance with the present invention.
Detailed Description
The present invention will be further described below.
As shown in fig. 1, the specific steps of the present invention are:
A. One side of the small coal pillar is finished with a tunneling work, the tunnel is used as a tunneling tunnel, and a large-diameter drilling hole is adopted to perform advanced and rear pressure relief on two sides of the tunneling tunnel;
B. The width and trend of a roadway to be excavated are predetermined on the other side of the small coal pillar, the roadway to be excavated is parallel to the excavated roadway, then the range of impact danger areas and impact danger levels existing on a preset path of the tunneled roadway are predicted by using a known impact danger prediction method, and weak, medium and strong impact danger areas are respectively defined;
C. And B, tunneling the roadway according to the width and trend of the roadway to be excavated, when the distance f between the tunneling head of the roadway to be excavated and the impact danger area range determined in the step B is smaller than 40m, constructing a first large-diameter drilling hole in the roadway to be excavated at the side of the roadway close to the small coal pillar in the direction perpendicular to the roadway to be excavated, wherein the diameter of the first large-diameter drilling hole is 150mm, the large-diameter drilling hole sequentially penetrates through the small coal pillar and the roadway to be excavated to enter the solid coal of the working face to be excavated, and the distance h between the large-diameter drilling hole and the bottom plate of the roadway to be excavated is 1.3m. By adopting the parameter setting, the effect of advanced pressure relief can be effectively ensured, and the construction efficiency can be effectively improved; continuously tunneling a roadway to be excavated in the construction process of the first large-diameter drilling hole, wherein the depth d of the large-diameter drilling hole is calculated according to the following formula as shown in fig. 3;
d＝a+b+c
Wherein a is the width of the small coal pillar, m; b is the width of a roadway to be excavated, m; c is the depth of the large-diameter drilling hole penetrating into the solid coal of the working face to be excavated, m is required to meet the requirement that c is more than or equal to 2b; thereby completing the construction of the first large-diameter borehole;
D. Along with continuous tunneling of a roadway to be drilled, after a first large-diameter drilling hole is constructed in the step C, a plurality of large-diameter drilling holes are arranged along the direction of a predetermined roadway to be drilled, the side of the roadway, close to a small coal pillar, of the drilled roadway after the first large-diameter drilling hole is provided with a plurality of large-diameter drilling holes in a row, the construction parameters of the large-diameter drilling holes are the same, the distance e among the large-diameter drilling holes is determined according to the grade of the large-diameter drilling holes penetrating through an impact dangerous area, wherein the distance e through the weak impact dangerous area is e 1, the distance e 2 penetrating through a medium impact dangerous area is e 3;e1, the distance e 2 is 2.0m, and the distance e 3 is 1.0m;
E. And (2) carrying out the simultaneous process of continuous tunneling and advanced large-diameter drilling and pressure relief on the roadway to be excavated, wherein as shown in fig. 2, the distance between the position of each large-diameter drilling and the tunneling head in the construction process is always more than or equal to 20m, so that the tunneling and pressure relief process of the whole roadway to be excavated is completed.
The known impact risk prediction method is one or more of a comprehensive index method, a multi-factor mode identification method, a multi-factor coupling analysis method, a shock wave CT inversion method, an electromagnetic radiation method and a mine pressure observation method.
The foregoing is only a preferred embodiment of the invention, it being 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 present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (3)
1. A pre-pressure relief method for advanced large-diameter drilling of a small coal pillar tunneling roadway is characterized by comprising the following specific steps:
A. One side of the small coal pillar is finished with a tunneling work, the tunnel is used as a tunneling tunnel, and a large-diameter drilling hole is adopted to perform advanced and rear pressure relief on two sides of the tunneling tunnel;
B. The width and trend of a roadway to be excavated are predetermined on the other side of the small coal pillar, the roadway to be excavated is parallel to the excavated roadway, then the range of impact danger areas and impact danger levels existing on a preset path of the tunneled roadway are predicted by using a known impact danger prediction method, and weak, medium and strong impact danger areas are respectively defined;
C. B, tunneling the roadway according to the width and trend of the roadway to be excavated, when the distance f between the tunneling head of the roadway to be excavated and the impact danger area range determined in the step B is smaller than 40m, constructing a first large-diameter drilling hole in the roadway to be excavated at the side of the roadway close to the small coal pillar vertically in the excavated roadway at the side of the small coal pillar, enabling the large-diameter drilling hole to sequentially penetrate through the small coal pillar and the roadway to be excavated to enter solid coal of the working face to be excavated, continuously tunneling the roadway to be excavated in the construction process of the first large-diameter drilling hole, and calculating the depth d of the large-diameter drilling hole according to the following formula;
d＝a+b+c
Wherein a is the width of the small coal pillar, m; b is the width of a roadway to be excavated, m; c is the depth of the large-diameter drilling hole penetrating into the solid coal of the working face to be excavated, m is required to meet the requirement that c is more than or equal to 2b; thereby completing the construction of the first large-diameter borehole;
D. Along with continuous tunneling of a roadway to be drilled, after a first large-diameter drilling hole is constructed in the step C, a plurality of large-diameter drilling holes are arranged on the roadway side of the first large-diameter drilling hole, which is close to the small coal pillar, along the direction of the predetermined roadway to be drilled, construction parameters of the large-diameter drilling holes are the same, the distance e between the large-diameter drilling holes is determined according to the grade of the large-diameter drilling holes passing through an impact dangerous area, wherein the distance e passing through the weak impact dangerous area is e 1, the distance e 2 passing through the medium impact dangerous area is e 3; and e 1＞e2＞e3;
E. And in the process of continuous tunneling and advanced large-diameter drilling and pre-pressure relief of the roadway to be excavated, the distance between the position of each large-diameter drilling and the tunneling head in the construction process always meets g more than or equal to 20m, so that the tunneling and pressure relief process of the whole roadway to be excavated is completed.
2. The advanced large-diameter drilling pre-pressure relief method for the small coal pillar tunneling roadway according to claim 1, wherein the known impact risk prediction method is one or more of a comprehensive index method, a multi-factor pattern recognition method, a multi-factor coupling analysis method, a shock wave CT inversion method, an electromagnetic radiation method and a mine pressure observation method.
3. The advanced large diameter drilling pre-pressure relief method for small coal pillar tunnelling roadway according to claim 1, wherein the diameter of each large diameter drilling is 100-200 mm, the distance e 1 is 3.0m, the distance e 2 is 2.0m, the distance e 3 is 1.0m, and the distance h between all large diameter drilling holes and the tunnelled roadway floor is 1.0 m-1.5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210818334.4A CN115059469B (en) | 2022-07-13 | 2022-07-13 | Advanced large-diameter drilling pre-pressure relief method for small coal pillar tunneling roadway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210818334.4A CN115059469B (en) | 2022-07-13 | 2022-07-13 | Advanced large-diameter drilling pre-pressure relief method for small coal pillar tunneling roadway |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115059469A CN115059469A (en) | 2022-09-16 |
| CN115059469B true CN115059469B (en) | 2024-06-21 |
Family
ID=83206100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210818334.4A Active CN115059469B (en) | 2022-07-13 | 2022-07-13 | Advanced large-diameter drilling pre-pressure relief method for small coal pillar tunneling roadway |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115059469B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939099A (en) * | 2014-04-11 | 2014-07-23 | 中国矿业大学 | Method for controlling strong shock risk coal seam group rock burst |
| CN109915140A (en) * | 2019-04-13 | 2019-06-21 | 山东科技大学 | Press control method to a kind of irregular gob-surrounded pillar roadway bump |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110067557B (en) * | 2019-04-16 | 2020-08-11 | 中国矿业大学 | Pressure relief method for fully mechanized caving mining bottom coal of steeply inclined coal seam |
| CN112431596B (en) * | 2020-11-26 | 2022-02-15 | 中煤科工开采研究院有限公司 | Three-stage prevention and control method for rock burst roadway |
| CN113202482A (en) * | 2021-06-23 | 2021-08-03 | 李文科 | Deep mining mine three-soft coal seam roadway tunneling drilling pressure relief method |
-
2022
- 2022-07-13 CN CN202210818334.4A patent/CN115059469B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939099A (en) * | 2014-04-11 | 2014-07-23 | 中国矿业大学 | Method for controlling strong shock risk coal seam group rock burst |
| CN109915140A (en) * | 2019-04-13 | 2019-06-21 | 山东科技大学 | Press control method to a kind of irregular gob-surrounded pillar roadway bump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115059469A (en) | 2022-09-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110529113B (en) | Anti-impact method for deep well thick coal seam complex geological condition multi-factor coupling high stress area crossing contact roadway | |
| CN111502662B (en) | Prevention and control method for deep pressure relief shallow part reinforcement of rock burst mine advanced coal body | |
| CN114215530B (en) | Rapid roadway digging method for directional hydraulic fracturing gob-side roadway of hard top plate | |
| CN111058847B (en) | Continuous large-aperture deep hole blasting mechanized mining method for thick and large ore body | |
| CN106930766A (en) | Great burying TBM construction tunnel rock burst processing structures | |
| CN115012936B (en) | Pressure relief and danger relieving method for coal mine TBM during tunneling and coal penetration | |
| CN111396118A (en) | Coal seam group rapid rock cross-cut coal uncovering outburst eliminating method | |
| CN113982582A (en) | Method for hydraulic fracturing treatment of end triangular area suspended roof of underground coal mine coal face | |
| CN114293989B (en) | Anti-scour method for near-vertical ultra-thick coal seam subsection hydraulic fracturing area | |
| CN114856564A (en) | Rock burst coal seam roadway anti-scour pressure-relief tunneling method | |
| CN106761750A (en) | Slot type recovery method is built in the longwell plane milling of half-edge coal seam longitudinal direction | |
| CN115749777A (en) | Method for three-dimensionally preventing rock burst of coal mine at all time intervals | |
| CN116771348A (en) | Method for reducing dynamic pressure influence of main roadway in last mining and optimizing stoping line coal pillar | |
| CN112412528A (en) | Regional outburst elimination method for cross-section rock cross section of close-range coal seam group | |
| CN115059469B (en) | Advanced large-diameter drilling pre-pressure relief method for small coal pillar tunneling roadway | |
| CN113216912A (en) | Perforating gun for reducing mine earthquake grade and method for reducing mine earthquake grade through hydraulic fracturing | |
| CN102733851B (en) | Control method for water-containing collapse columns in mining affected areas of combined reconstructed mines | |
| CN112324499A (en) | Method for preventing rock burst by blocking disturbance stress wave | |
| CN114575844A (en) | Roadway roof segmented pressure relief and reinforcement control method based on double-roadway excavation | |
| CN114294018A (en) | Method for rapid passing of advanced dense top protection layer grouting in loose slip region | |
| CN115288632B (en) | Design method for preventing first-row drilling damage of separation layer grouting | |
| CN112324489B (en) | Gas drainage drill hole arrangement method for large-section tunnel penetrating through coal seam with small included angle | |
| CN112211644B (en) | Method for guaranteeing coal roadway driving of soft coal seam containing gas coal roadway strip | |
| CN109209383A (en) | A kind of method of double back production prevention and treatment rock bursts of going up a hill | |
| CN117803443B (en) | Close range coal seam mining gas control method based on roof-floor rock stratum breaking characteristics |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |