CN113863927B - Method for pre-cutting roof and releasing pressure of coal seam working face - Google Patents
Method for pre-cutting roof and releasing pressure of coal seam working face Download PDFInfo
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- CN113863927B CN113863927B CN202111187215.5A CN202111187215A CN113863927B CN 113863927 B CN113863927 B CN 113863927B CN 202111187215 A CN202111187215 A CN 202111187215A CN 113863927 B CN113863927 B CN 113863927B
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- 239000003245 coal Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 37
- 239000002360 explosive Substances 0.000 claims abstract description 10
- 238000005422 blasting Methods 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000000605 extraction Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 11
- 230000009286 beneficial effect Effects 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- E21C37/04—Other methods or devices for dislodging with or without loading by devices with parts pressed mechanically against the wall of a borehole or a slit
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (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 a method for pre-roof cutting and pressure relief of a coal seam working face, which comprises the steps of determining the position of a stoping line and the pushing position of the coal seam working face, then arranging a connecting roadway and a pressure relief measure roadway, arranging pressure relief drilling holes in the pressure relief measure roadway and parallel to the coal seam working face, placing explosive in the pressure relief drilling holes, and then blasting and roof caving; and (5) carrying out recovery and stoping on the working face of the coal seam, and continuously discharging coal until the position of a stoping bit line is reached. The method disclosed by the invention has the advantages of small drilling construction difficulty, convenience in operation, good roof cutting effect after implementation and high non-mining extraction rate, and is beneficial to protecting the stability of a main roadway; the invention solves the problem of difficult pressure relief of the hard roof of the ultra-thick coal seam; roof cutting is carried out from a coal seam roof, roof cutting difficulty caused by the thickness of a coal seam is avoided, the requirement on drilling depth is reduced, the construction difficulty of blast holes is reduced, the lancing effect is greatly improved, the stability of a large roadway is well protected, the caving performance of coal is improved, the width of a coal pillar of a roadway is reduced, the end mining rate is greatly improved, and the economic benefit is good.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a method for pre-roof cutting and pressure relief of a coal seam working face.
Background
At present, the problem that the hard top plate is distributed in a large amount in mining areas in China is always plagued by mining workers for mining areas adopting fully-mechanized mining, if the top plate is mainly composed of sandstone groups, the top plate is difficult to fall, and the problems of large step span, serious gas accumulation, large reserved coal pillars, low mining rate and the like are caused.
In the last mining period, in order to maintain the stability of the large roadway, reduce the width of a reserved coal pillar between the large roadway of a mining area and a stoping line, improve the mining rate of a mine, often cut off the transmission of stoping dynamic pressure by adopting a roof cutting method, and improve the coal discharge amount.
However, when the thickness of the coal seam exceeds 20m, if the roof is cut upwards directly from the working face of the existing coal seam, the distance from the roof of the rock above the coal seam is far, a long drilling hole meeting the requirements is difficult to construct in the roof of the coal seam by a common roof cutting drilling machine and dustproof water pressure, and moreover, the joint cutting effect is difficult to ensure due to the fact that part of the drilling hole is burst in the coal seam. When roof cutting is carried out on a top plate, roof cutting and pressure relief are usually carried out on ultra-deep drilling holes, but construction of the ultra-deep drilling holes is difficult, and roof cutting effects are general.
Accordingly, a need exists to provide a new method of roof cutting and pressure relief that would be a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a method for pre-roof cutting and pressure relief of a coal seam working face, which has the advantages of small drilling construction difficulty, convenient operation, good roof cutting effect after implementation and high non-mining rate, and is beneficial to protecting the stability of a large roadway.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for pre-roof cutting and pressure relief of a coal seam working face comprises the following steps:
(1) Determining a periodic step-pressing distance of the coal seam working face according to the rock formation lithology and hydrogeological conditions of the coal seam working face top plate; setting a stoping line outside the periodical pressure-starting position, wherein the distance between the stoping line and the periodical pressure-starting position is 0.4-0.6 time of the periodical pressure-starting step distance;
(2) A connecting roadway is arranged upwards towards the roof of the coal seam when the transportation gate or the return air gate approaches to the stope shifting gate; a pressure relief measure lane is downwards arranged along a coal seam roof at a position of the connecting lane right above the coal seam working surface, so that the pressure relief measure lane is close to a tail beam of a hydraulic support arranged on the stoping line; arranging a row of constant-resistance anchor cables on the goaf side close to the advancing direction of the coal seam working surface;
(3) Arranging a row of pressure relief drilling holes in the pressure relief measure roadway at intervals which are parallel to the coal seam working face, placing explosive in the pressure relief drilling holes, and then blasting and roof caving;
(4) And (5) carrying out recovery from the coal seam working face, and continuously discharging coal until the stoping line.
The beneficial effects of the above preferable technical scheme are as follows: the roof cutting is carried out from the coal seam roof, roof cutting difficulty caused by the coal seam thickness is avoided, the drilling depth requirement is reduced, the construction difficulty of blast holes is reduced, the lancing effect is greatly improved, the stability of a large roadway is well protected, the caving performance of coal is improved, multiple recovery of coal resources is ensured on the premise of ensuring the safety of the roof of a withdrawal channel, the width of a coal pillar of a roadway is reduced, the non-mining rate is greatly improved, and the economic benefit is good; the full coal caving stope is realized during the working face stope of the coal seam, so the goaf has little coal loss, and the threat of goaf ignition is further reduced
Preferably, in the step (2), the angle of the connecting lane is 15-20 degrees, and the length is 50-60 m.
The beneficial effects of the above preferable technical scheme are as follows: preconditions are obtained for the arrangement of pressure relief measures and roadways, and meanwhile, the requirements of ventilation of pedestrians and material transportation are met.
Preferably, the length of the pressure relief measure lane in the step (2) is equal to that of the coal seam working face, the section width of the pressure relief measure lane is 2.0-3.0 m, and the height is 2.5-3.5 m; the pressure relief measure roadway is supported by an anchor cable net; the distance between the constant-resistance anchor cables is 1000mm.
The beneficial effects of the above preferable technical scheme are as follows: the pressure relief measure lane is an arrangement lane of a roof cutting and drilling hole, and the roof cutting is carried out in the pressure relief measure lane, so that the transmission of a withdrawal channel of the back pressure of the working face to the back of the stoping line and a main lane at the periphery of the working face is cut off, and the stability and safety of the demolition channel and the top plate of the main lane can be ensured.
Preferably, the arrangement of the connecting lane and the pressure relief measure lane is constructed by adopting a comprehensive mechanized working line consisting of a multifunctional lane repair machine, a wheel loader and a 40Z type scraper conveyor.
The beneficial effects of the above preferable technical scheme are as follows: and the comprehensive mechanical construction is adopted, so that the construction progress is quickened, the time cost is saved, and the working efficiency is greatly improved.
Preferably, the fixed distance in the step (3) is 0.8-1.2 m; the diameter of the pressure relief drilling holes is 50mm, and the distance between the pressure relief drilling holes is 0.8-1.2 m; the explosive is a coal mine gas extraction water gel grain with the diameter of 35 mm.
The beneficial effects of the above preferable technical scheme are as follows: the drilling diameter of 50mm has both reduced the work degree of difficulty of large aperture drilling, has also reached the best blasting and has cut the top effect simultaneously. The water gel explosive extracted from coal mine gas can be used as explosive column and is sent into the drill hole, and meanwhile, the water gel explosive has good explosion-proof performance.
Preferably, the pressure relief borehole is formed using a drill with an electric drill diameter of 50 mm.
The beneficial effects of the above preferable technical scheme are as follows: the electric drilling machine is adopted to achieve faster drilling efficiency, and the labor intensity of workers is reduced.
Compared with the prior art, the invention discloses a method for pre-cutting the roof and releasing pressure of the working face of the coal seam, which has the following beneficial effects:
(1) Before the coal seam working face recovery dynamic pressure influences the roof-cutting measure roadway, blasting, roof-cutting and pressure relief are implemented so as to cut off the transmission of coal seam working face recovery pressure to roadways such as a retracting channel and the like;
(2) The method comprises the steps of pre-digging a small-section roof cutting pressure relief measure roadway at the top of a coal seam at the rear position of a tail beam of a hydraulic support at a coal seam working face stoping line in advance, so that a better joint cutting effect is achieved;
(3) Roof cutting and pressure relief are carried out on a pressure relief measure roadway at the coal seam roof, the drilling length requirement is low, the drilling construction difficulty is reduced, and the roof cutting effect is better;
(4) Before the coal seam working face is pushed to the stoping line position, blasting, roof cutting and pressure relief are implemented from the roof cutting and pressure relief measure lane, so that the transmission of the coal seam working face stoping pressure to a withdrawal channel behind the stoping line and a main lane at the periphery of the coal seam working face is cut off, and the stability and safety of the top plate of the demolishing channel and the like can be ensured;
(5) The full coal caving stope is realized during the working face stope of the coal seam, so that the goaf has little coal loss, and the threat of goaf ignition is further reduced;
(6) The invention has better roof cutting and pressure relief effects, greatly reduces the width of the roadway-protecting coal column, improves the caving and releasing performance of roof coal, greatly improves the yield and improves the economic benefit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a plan view of an arrangement in the method of pre-roof cutting and pressure relief of a coal seam face provided in example 1;
FIG. 2 is a cross-sectional view of an arrangement in the method of pre-roof cutting and pressure relief of a coal seam face provided in example 1;
fig. 3 is a layout of a drill hole in the method for relieving pressure of the last pre-cut roof of the working face of the coal seam provided in example 1.
In the figure: the system comprises a return air gate, a transportation gate, a pressure relief measure gate, a mining area transportation mountain, a mining area track mountain, a connecting gate, a withdrawal channel, a hydraulic support, a mining stopping line, coal, a goaf and a blast hole, wherein the return air gate is 1, the transportation gate is 2, the pressure relief measure gate is 3, the mining area transportation mountain is 4, the mining area track mountain is 5, the connecting gate is 6, the withdrawal channel is 7, the hydraulic support is 8, the mining stopping line is 9, the coal is 10, the goaf is 11, and the blast hole is 12.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
The embodiment 1 of the invention discloses a method for relieving pressure of a coal seam working face by pre-cutting the roof, which comprises the following steps:
(1) Determining a periodic step-pressing distance of the coal seam working face according to the rock formation lithology and hydrogeological conditions of the coal seam working face top plate; setting a stoping line outside the periodical pressure-starting position, wherein the distance between the stoping line and the periodical pressure-starting position is 0.4-0.6 time of the periodical pressure-starting step distance;
wherein the angle of the connecting lane is 15-20 degrees and the length is 50-60 m;
the length of the pressure relief measure lane is equal to that of the coal seam working face, the section width of the pressure relief measure lane is 2.0-3.0 m, and the height is 2.5-3.5 m; the pressure relief measure roadway is supported by an anchor cable net; the spacing of the constant-resistance anchor cables is 1000mm;
(2) A connecting roadway is arranged upwards towards the roof of the coal seam when the transportation gate or the return air gate approaches to the stope shifting gate; a pressure relief measure lane is downwards arranged along a coal seam roof at a position of the connecting lane right above the coal seam working surface, so that the pressure relief measure lane is close to a tail beam of a hydraulic support arranged on the stoping line; arranging a row of constant-resistance anchor cables on the goaf side close to the advancing direction of the coal seam working surface;
(3) Arranging a row of pressure relief drilling holes in the pressure relief measure roadway at intervals which are parallel to the coal seam working face, placing explosive in the pressure relief drilling holes, and then blasting and roof caving;
the fixed distance is 0.8-1.2 m; the pressure relief drilling holes are formed by drilling holes through a drilling machine with the drilling diameter of 50mm, the pressure relief drilling holes are 50mm in diameter, and the pressure relief drilling hole spacing is 0.8-1.2 m; the explosive is a coal mine gas extraction water gel column with the diameter of 35 mm;
(4) Collecting and stoping from the coal seam working face, and continuously discharging coal until the stoping line
Wherein, the arrangement connecting lane and the pressure relief measure lane are constructed by adopting a comprehensive mechanized operation line composed of a multifunctional lane repair machine, a wheel loader and a 40Z type scraper conveyor.
The method for relieving the pressure of the end-mining pre-roof of the working face of the coal seam solves the problem that the pressure relief of the hard roof of the ultra-thick coal seam is difficult. Roof cutting is carried out from a coal seam roof, roof cutting difficulty caused by the thickness of the coal seam is avoided, the requirement on drilling depth is reduced, the construction difficulty of blast holes is reduced, the lancing effect is greatly improved, the stability of a large roadway is well protected, the caving performance of coal is improved, multiple recovery of coal resources is ensured on the premise of ensuring the safety of a back-draw channel roof, the width of a roadway-protecting coal pillar is reduced, the non-mining rate is greatly improved, and the economic benefit is good. The full coal caving stope is realized during the working face working period of the coal seam, so that the goaf has little coal loss, and the threat of goaf ignition is further reduced.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The method for pre-roof cutting and pressure relief of the working face of the coal bed is characterized by comprising the following steps of:
(1) Determining a periodic step-pressing distance of the coal seam working face according to the rock formation lithology and hydrogeological conditions of the coal seam working face top plate; setting a stoping line outside the periodical pressure-starting position, wherein the distance between the stoping line and the periodical pressure-starting position is 0.4-0.6 time of the periodical pressure-starting step distance;
(2) A connecting roadway is arranged upwards towards the roof of the coal seam when the transportation gate or the return air gate approaches to the stope shifting gate; a pressure relief measure lane is downwards arranged along a coal seam roof at a position of the connecting lane right above the coal seam working surface, so that the pressure relief measure lane is close to a tail beam of a hydraulic support arranged on the stoping line; arranging a row of constant-resistance anchor cables on the goaf side close to the advancing direction of the coal seam working surface, arranging a pressure relief measure lane along the stoping line direction, and enabling the length of the pressure relief measure lane to be equal to the length of the coal seam working surface;
(3) Arranging a row of pressure relief drilling holes in the pressure relief measure roadway at intervals which are parallel to the coal seam working face, placing explosive in the pressure relief drilling holes, and then blasting and roof caving;
(4) And (5) carrying out recovery from the coal seam working face, and continuously discharging coal until the stoping line.
2. The method for relieving pressure on the end of the pre-cut roof of the coal seam working face according to claim 1, wherein the angle of the connecting roadway in the step (2) is 15-20 degrees, and the length is 50-60 m.
3. The method for pre-roof cutting and pressure relief of the coal seam working face according to claim 1, wherein the length of the pressure relief measure lane in the step (2) is equal to that of the coal seam working face, the section width of the pressure relief measure lane is 2.0-3.0 m, and the height is 2.5-3.5 m; the pressure relief measure roadway is supported by an anchor cable net; the distance between the constant-resistance anchor cables is 1000mm.
4. A method for pre-roof cutting and pressure relief of a coal seam working face according to claim 2 or 3, wherein the arrangement of the connecting roadway and the pressure relief measure roadway is constructed by adopting a comprehensive mechanized working line consisting of a multifunctional roadway repairing machine, a wheel loader and a 40Z type scraper conveyor.
5. The method for pre-roof cutting and pressure relief of the coal seam working face according to claim 1, wherein the fixed distance in the step (3) is 0.8-1.2 m; the diameter of the pressure relief drilling holes is 50mm, and the distance between the pressure relief drilling holes is 0.8-1.2 m; the explosive is a coal mine gas extraction water gel grain with the diameter of 35 mm.
6. The method for pre-roof cutting and pressure relief of a coal seam face as claimed in claim 5, wherein the pressure relief borehole is formed by drilling with a drilling machine having a borehole diameter of 50 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111187215.5A CN113863927B (en) | 2021-10-12 | 2021-10-12 | Method for pre-cutting roof and releasing pressure of coal seam working face |
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| CN202111187215.5A CN113863927B (en) | 2021-10-12 | 2021-10-12 | Method for pre-cutting roof and releasing pressure of coal seam working face |
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| CN113863927A (en) | 2021-12-31 |
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