CN111396118A - Coal seam group rapid rock cross-cut coal uncovering outburst eliminating method - Google Patents
Coal seam group rapid rock cross-cut coal uncovering outburst eliminating method Download PDFInfo
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- CN111396118A CN111396118A CN202010196204.2A CN202010196204A CN111396118A CN 111396118 A CN111396118 A CN 111396118A CN 202010196204 A CN202010196204 A CN 202010196204A CN 111396118 A CN111396118 A CN 111396118A
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- 239000003245 coal Substances 0.000 title claims abstract description 154
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000011435 rock Substances 0.000 title claims description 41
- 230000008030 elimination Effects 0.000 claims abstract description 18
- 238000003379 elimination reaction Methods 0.000 claims abstract description 18
- 238000000605 extraction Methods 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 12
- 239000004575 stone Substances 0.000 claims description 16
- 230000005641 tunneling Effects 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 9
- 230000002265 prevention Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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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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- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a rapid cross-cut coal uncovering outburst elimination method for a coal seam group, which comprises the steps of excavating two cross-cuts excavated in the same direction, arranging a drill site along the outer edge of a cross-cut coal uncovering roadway in the direction from the head to the coal seam of a cross-cut coal uncovering working face, and constructing a plurality of cross-cut long drill holes for extraction; if the residual gas content and the residual gas pressure are smaller than the specification, uncovering the first layer of coal according to the program, performing examination by adopting an effect examination hole to eliminate outburst when the normal distance between the development heading and the second layer of coal is 7-10 meters, and uncovering the second layer of coal according to the program until all coal beds in a drilling hole control area are uncovered; after the first cross-cut uncovers coal, constructing a drill site along the coal seam at a side close to the second cross-cut, constructing the coal seam, drilling and extracting to control the coal seam in front of the second cross-cut, and after the extraction reaches the standard, if the content of residual gas and the pressure of the residual gas are less than the specification, allowing the second cross-cut to directly carry out coal uncovering operation; the method solves the problems that the existing extraction time is relatively long, the outburst elimination effect is not obvious and the like.
Description
Technical Field
The invention belongs to the technology of underground gas extraction of coal mines, and particularly relates to a method for quickly cross-cut coal uncovering and outburst elimination of coal seam groups.
Background
The gas is a gas generated along with coal, is a factor seriously threatening the safety production of coal mines, and is caused by the gas in most coal accidents in China. At present, coal mines in China have the characteristics of deep mining, low permeability of coal seams, high gas pressure and the like, and the coal seams are mined under complex geological conditions, so that the phenomenon of gas power of the coal seams is more frequent under certain conditions.
The coal and gas outburst accident refers to an abnormal power phenomenon that broken coal and gas are suddenly thrown out of a coal body or a rock body to a mining space under the combined action of ground stress and gas in the coal mining process, and is characterized in that broken coal and rock bodies of several tons to thousands of tons or even more than tens of thousands of tons are thrown out of the coal and rock body to the mining space within several seconds to dozens of seconds, and simultaneously, a large amount of gas is emitted, so that the damage is extremely serious. In the coal and gas outburst accidents, the probability is higher when the coal bed with coal and gas outburst danger is uncovered, and the life safety of coal miners is seriously damaged. At present, a plurality of outburst prevention methods for cross cut coal uncovering exist, but the method for quickly cross cut coal uncovering of a coal seam group is few, coal seam gas flow inside the coal seam group accords with the spherical flow, the gas flow field belongs to the spherical flow field, gas can be continuously supplied to the cross cut direction under the action of gas pressure gradient, the gas content and pressure of the coal seam around the cross cut are effectively reduced, outburst elimination is performed on the coal seam in front of a cross cut coal uncovering working face one by one in the double cross cut tunneling process, coal and gas outburst risks still exist, extraction time is relatively long, outburst elimination effects are not obvious, and other factors exist. Therefore, the invention provides a rapid rock cross-cut coal uncovering outburst elimination method for the coal seam group, so that the current situation of rock cross-cut coal uncovering of the coal seam group is changed, the outburst elimination effect is improved, and the safety production of a coal mine is powerfully ensured.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method is used for solving the problems that coal seams in front of a cross cut coal uncovering working face are subjected to outburst elimination one by one in the process of double cross cut tunneling under a coal mine in the prior art, coal and gas outburst risks still exist, extraction time is relatively long, outburst elimination effects are not obvious and the like.
The technical scheme adopted by the invention is as follows:
a coal seam group rapid rock cross-cut coal uncovering outburst elimination method comprises the following steps:
and 4, after the drainage from the drill site in the first portal to the drill hole constructed in the second portal reaches the standard, detecting by using an effect detection hole, if the content of residual gas and the pressure of the residual gas are less than the regulations of 'prevention and control of coal and gas outburst fine rules', eliminating outburst, and allowing the second portal to directly perform coal uncovering operation.
The invention has the beneficial effects that:
the method has the advantages that two stone gates which are exploited in the same direction are firstly drilled with long drill holes at the first stone gate to carry out outburst elimination and drilling (multilayer coal outburst elimination) on the coal seam group, a drill site is constructed to pre-pump the coal seam gas in front of the second stone gate, when the second stone gate is constructed until the distance from the drill site of the first stone gate in front to the normal direction of the pumped coal seam is more than or equal to 7m, effect inspection is carried out, the result reaches the standard, and then the stone gate can be directly drilled.
According to the invention, the long drill holes are used for extracting and eliminating outburst of multiple layers of coal in the first rock cross two-side drill site, and when the coal uncovering operation of the working face is carried out, gas of the later layers of coal can be extracted in the drill sites simultaneously, so that the number of times of coal uncovering and drilling at the head-on construction of the working face is reduced, and the time required by coal uncovering and extracting of a single coal seam is greatly shortened; the construction bedding drilling hole in the first rock cross drilling field eliminates the outburst for the second rock cross coal uncovering, reduces the time for eliminating the outburst for the construction drilling hole in the second rock cross, promotes the exploitation efficiency, and ensures the coal mine safety production.
The coal mine outburst elimination device solves the problems that in the prior art, coal seams in front of a cross cut coal uncovering working face are subjected to outburst elimination one by one in the underground double-cross cut tunneling process of a coal mine, coal and gas outburst risks still exist, extraction time is relatively long, outburst elimination effects are not obvious, and the like.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a plan view of an embodiment of the present invention 1;
FIG. 3 is a plan view of an embodiment of the present invention 2;
in the figure: 1 is a stone door; 2 is a coal bed; 3 is a drill site; 4, drilling through layers; and 5, a rock cross-cut coal uncovering working surface.
Detailed Description
A coal seam group rapid rock cross-cut coal uncovering outburst elimination method comprises the following steps:
and 4, after the drainage from the drill site in the first portal to the drill hole constructed in the second portal reaches the standard, detecting by using an effect detection hole, if the content of residual gas and the pressure of the residual gas are less than the regulations of 'prevention and control of coal and gas outburst fine rules', eliminating outburst, and allowing the second portal to directly perform coal uncovering operation.
The invention will be further described in the following with reference to the accompanying drawings:
as shown in fig. 1, a coal seam group is arranged in front of a goaf 1, coal seams 2 are distributed, the normal distance from the goaf 1 to a first coal layer 2 is 7m, and the horizontal distance is 20 m; when the normal distance between the rock gate 1 and the coal seam 2 is more than or equal to 7m, a drill site 3 is arranged on two sides of the rock gate 1 roadway, a cross-layer and cross-layer drill hole 4 is constructed in the direction of the coal seam, and the cross-layer drill hole 4 is constructed to penetrate through the last coal seam by 1 m. The control range of the cross-layer drill hole 4 is from 15m above a coal point to 15m below the coal point. As shown in fig. 2, two stone gates 1 are tunneled simultaneously, the drill sites 3 are respectively located on the left and right sides of the stone gates 1, and the drilling control range is 15m for each of the left and right sides of the stone gates 1; the borehole 3 penetrates the coal seam ahead.
As shown in fig. 3, when gas extraction of the left and right sides of the drill site of the lower rock gate 1 reaches the standard, the rock gate 1 is advanced to a depth; when the advancing ruler of the lower rock cross-cut coal uncovering working face 5 exceeds a coal bed in front of the upper rock cross-cut coal uncovering working face 5, the lower rock cross-cut 1 is constructed in the left-side drill site 3 to drill a cross-layer drill hole 4 to extract coal bed gas in front of the upper rock cross-cut coal uncovering working face 5, and construction is continued, so that the gas extraction time of the upper rock cross-cut 1 is saved, and the safe and orderly operation of rock cross-cut coal uncovering work is ensured.
Claims (2)
1. A coal seam group rapid rock cross-cut coal uncovering outburst elimination method comprises the following steps:
step 1, tunneling two rock cross-cut tunneling in the same direction, when a rock cross-cut coal uncovering working face in a first rock cross-cut tunnels to a normal distance from a coal bed to be 7-10 m, arranging a drill site along the outer edge of a rock cross-cut coal uncovering roadway in the direction from the head of the rock cross-cut coal uncovering working face to the coal bed, and constructing a plurality of layer-penetrating long drill holes to extract coal bed gas;
step 2, after the extraction of the long drill hole of the first stone gate is up to the extraction standard, checking a construction effect check hole in front of the head of a working face, if the content and the pressure of residual gas are smaller than the specification of 'fine control coal and gas outburst', eliminating outburst, uncovering a first layer of coal according to a program, continuing to dig forward after completing coal uncovering operation, and checking the construction effect check hole when the normal distance of the second layer of coal is 7-10 meters, if the content and the pressure of residual gas are smaller than the specification of 'fine control coal and gas outburst', eliminating outburst is reached, uncovering the second layer of coal according to a program until all coal layers in a drilling control area are uncovered;
step 3, after the first cross-cut uncovers the coal, constructing a drill site along the coal seam at one side close to the second cross-cut, constructing a drill hole of the coal seam to extract and control the coal seam in front of the second cross-cut, and controlling the range of at least 12m outside the outline of the second cross-cut by the drill hole;
and 4, after the drainage from the drill site in the first portal to the drill hole constructed in the second portal reaches the standard, detecting by using an effect detection hole, if the content of residual gas and the pressure of the residual gas are less than the regulations of 'prevention and control of coal and gas outburst fine rules', eliminating outburst, and allowing the second portal to directly perform coal uncovering operation.
2. The method for rapid rock cross-cut coal uncovering and outburst elimination of the coal seam group according to claim 1, wherein the method comprises the following steps: step 1, the long drilled hole is a drilled hole with the length of more than 80 meters; and the control range for constructing the extraction of the plurality of cross-layer long drill holes is at least 12 meters outside the first stone door contour line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196204.2A CN111396118A (en) | 2020-03-19 | 2020-03-19 | Coal seam group rapid rock cross-cut coal uncovering outburst eliminating method |
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| CN202010196204.2A CN111396118A (en) | 2020-03-19 | 2020-03-19 | Coal seam group rapid rock cross-cut coal uncovering outburst eliminating method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412527A (en) * | 2020-11-20 | 2021-02-26 | 贵州盘江精煤股份有限公司 | Centralized gas treatment method for coal groups in close-distance coal seam group |
| CN112412528A (en) * | 2020-11-20 | 2021-02-26 | 贵州盘江精煤股份有限公司 | Regional outburst elimination method for cross-section rock cross section of close-range coal seam group |
| CN112443351A (en) * | 2020-11-20 | 2021-03-05 | 贵州盘江精煤股份有限公司 | Precise outburst elimination method for cross-section coal uncovering of rock cross |
| CN113153416A (en) * | 2021-04-08 | 2021-07-23 | 重庆工程职业技术学院 | Method for eliminating protrusion in large area by utilizing horizontal main lane and directional ultra-long drill hole |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112412527A (en) * | 2020-11-20 | 2021-02-26 | 贵州盘江精煤股份有限公司 | Centralized gas treatment method for coal groups in close-distance coal seam group |
| CN112412528A (en) * | 2020-11-20 | 2021-02-26 | 贵州盘江精煤股份有限公司 | Regional outburst elimination method for cross-section rock cross section of close-range coal seam group |
| CN112443351A (en) * | 2020-11-20 | 2021-03-05 | 贵州盘江精煤股份有限公司 | Precise outburst elimination method for cross-section coal uncovering of rock cross |
| CN113153416A (en) * | 2021-04-08 | 2021-07-23 | 重庆工程职业技术学院 | Method for eliminating protrusion in large area by utilizing horizontal main lane and directional ultra-long drill hole |
| CN113153416B (en) * | 2021-04-08 | 2023-02-03 | 重庆工程职业技术学院 | Method for eliminating protrusion in large area by utilizing horizontal main lane and directional ultra-long drill hole |
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