CN113550782B - Gob-side entry retaining working face goaf gas and natural ignition composite disaster treatment method - Google Patents
Gob-side entry retaining working face goaf gas and natural ignition composite disaster treatment method Download PDFInfo
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- CN113550782B CN113550782B CN202110962202.4A CN202110962202A CN113550782B CN 113550782 B CN113550782 B CN 113550782B CN 202110962202 A CN202110962202 A CN 202110962202A CN 113550782 B CN113550782 B CN 113550782B
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- gob
- working face
- goaf
- side entry
- entry retaining
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21F17/103—Dams, e.g. for ventilation
Abstract
A gob gas and natural ignition composite disaster treatment method belongs to the field of coal mine safety and can solve the problems of large gas emission amount and serious natural ignition in a gob when gob-side entry-retaining pillar-free mining is carried out on a spontaneous combustion (easy spontaneous combustion) coal bed of a high gas mine at present. In the working face stoping process, constructing a gob-side entry retaining on one side of the goaf to realize gob-side entry retaining coal pillar-free mining; the working surface adopts a Y-shaped ventilation mode; when the working face is pushed forward for a certain distance, a goaf high-water material blocking wall is constructed behind the hydraulic support to divide the goaf into a plurality of independent and relatively closed areas; and in the gob-side entry retaining, an extraction pipe is buried in each independent and relatively closed area of the gob. The mode of combining Y-shaped ventilation and pipe burying extraction prevents the gas in the working face and the roadway from exceeding the limit; the high-water material blocking wall blocks air leakage of the goaf caused by Y-shaped ventilation and gas extraction, so that natural ignition of the goaf is prevented, and the gas extraction effect of the goaf is improved.
Description
Technical Field
The invention belongs to the field of coal mine safety, particularly belongs to the technical field of mine disaster prevention and control, and particularly relates to a gob gas and natural ignition composite disaster treatment method for a gob side entry retaining working face.
Background
The gob-side entry retaining coal pillar-free mining technology can improve the resource recovery rate of a mine, prolong the service life of the mine, reduce the excavation amount of a working face roadway, relieve the conflict of succession between mining and tunneling and shorten the moving time of the working face, and is an economical and effective mine coal mining method. The gob-side entry retaining coal pillar-free mining technology is applied to a plurality of thin and medium-thickness coal seam coal mining working faces with better conditions in China, and obtains good effect. However, when the technology is used in mines with complex conditions, huge potential safety hazards exist, and the technology is specifically shown in the following steps: under the condition of gob-side entry retaining pillar-free mining technology, the working face ventilation mode generally adopts two forms of Y-shaped and W-shaped. W-shaped ventilation easily causes gas accumulation at the upper corner, Y-shaped ventilation enables gas at the upper corner of a working face to be effectively discharged, but air leakage of a goaf is large, and natural ignition prevention and control of the goaf are difficult. In recent years, underground coal mining in China is continuously transferred to deep parts, the gas content of a coal seam is gradually increased, and the emission of gas in stoping can be effectively controlled by performing omnibearing three-dimensional extraction, but the possibility of natural ignition of coal is greatly increased due to air leakage of a coal body and a goaf caused by gas extraction, the danger degree of secondary disasters such as coal mine gas combustion or explosion caused by natural ignition of the coal is gradually upgraded, and the difficulty of disaster prevention and control is increased. Meanwhile, most mines have the phenomenon of coexistence of gas and natural ignition disasters. When gob-side entry retaining non-coal-pillar mining is carried out on a spontaneous combustion (easy spontaneous combustion) coal bed of a high-gas mine, Y-shaped ventilation, air quantity increase and gas extraction are adopted to control the gushing of gas at the upper corner of a goaf, but the three measures are all beneficial to the natural ignition of the goaf. Therefore, serious gas and natural ignition composite disasters in the goaf become bottlenecks limiting popularization and application of gob-side entry retaining coal pillar-free mining technology.
Disclosure of Invention
The invention provides a gob gas and natural ignition composite disaster treatment method for a gob working face, aiming at the difficult problems that when gob entry non-pillar mining is carried out on a spontaneous combustion (easy spontaneous combustion) coal seam of an existing high gas mine, the gob gas and natural ignition composite disaster is serious and difficult to control.
The invention adopts the following technical scheme:
a gob gas and natural ignition composite disaster treatment method for a gob working face is characterized in that a gob is constructed on one side of a gob, so that gob coal-pillar-free mining is realized, and a Y-shaped ventilation mode of belt gate and rail gate air intake and gob air return is adopted on a gob coal-pillar-free mining working face; after the working face is pushed forward by a distance L, a goaf high-water material blocking wall is constructed behind the hydraulic support to divide the goaf into a plurality of independent and relatively closed areas; when the working face is pushed to the middle position of the two blocks of high-water-material blocking walls, gas extraction pipes are buried in the goaf along the inclination, and after the relatively closed area is formed, the gas extraction pipes in the goaf are buried.
Further, the gob-side entry includes a packed gob-side entry or a cut-top gob-side entry.
Further, the spacing distance L of the high-water material blocking walls is determined by:
L=aVTwherein, in the step (A),V: the propelling speed of the working face is m/day;T: natural fire period of coal seam, day;a: and the safety coefficient ranges from 0.7 to 0.9.
Furthermore, the buried gas extraction pipe extends into the gob entry retaining and is merged into a goaf gas extraction main pipeline in the gob entry retaining, the buried gas extraction pipe is fully distributed with a plurality of open pores along the way, and the aperture of the open pores is increased along with the increase of the distance from the gob entry retaining.
And further, filling the gob-side entry retaining without coal pillar mining, and pouring a high-water material filling wall by adopting a gob-side entry retaining filling technology along with the advancing of the working face during the working face stoping, wherein the construction distance of the high-water material filling wall is close to the advancing distance of the working face.
Further, non-coal-pillar mining of a roof-cutting gob-side entry retaining, (1) before stoping, constructing a constant-resistance large-deformation anchor cable in advance in the roadway to reinforce the roadway, constructing bidirectional energy-gathering blasting holes along the roadway, performing presplitting blasting in front of a working face to form a roof-cutting line for cutting off a roof, and after the advance cutting is finished, starting propelling the working face;
(2) In the working face advancing process, in a temporary blocking area of a roof cutting and roadway forming, a single hydraulic prop and U-shaped steel are combined to support a stop lever, and air duct cloth is laid between the stop lever support and a goaf to temporarily close the goaf;
(3) And in the working face propelling process, permanently spraying a plugging area in a roof cutting and roadway forming process, and performing polyurethane spraying plugging on the gob-side roadway retaining side to form a polyurethane sealing wall.
The invention has the following beneficial effects:
according to the gob gas and natural ignition composite disaster treatment method for the gob side entry retaining working face, disclosed by the invention, the gas concentration of the upper corner of the working face is effectively reduced by a mode of combining Y-shaped ventilation and pipe burying extraction; the goaf is divided into a plurality of independent and relatively closed areas through the high-water material blocking wall and the gob-side entry retaining filling wall, air leakage of the goaf caused by Y-shaped ventilation and gas extraction is effectively blocked, natural ignition of the goaf is prevented, and meanwhile, the concentration and flow of gas extracted by buried pipes in the goaf can be obviously improved. The invention can solve the problems of large gas emission amount and serious natural ignition in the goaf when gob-side entry retaining coal pillar-free mining is carried out on a spontaneous combustion (easy spontaneous combustion) coal seam of a high gas mine, and ensures the smooth popularization of the gob-side entry retaining coal pillar-free mining technology.
Drawings
FIG. 1 is a plan view of a goaf gas and natural ignition composite disaster control method under a filling gob-side entry retaining coal pillar-free mining condition.
FIG. 2 is a perspective view of a goaf gas and natural ignition composite disaster control method under the filling gob-side entry retaining coal pillar-free mining condition.
FIG. 3 is a plan view of a goaf gas and natural ignition composite disaster control method under the roof cutting gob-side entry retaining coal pillar-free mining condition.
FIG. 4 is a perspective view of a goaf gas and natural ignition composite disaster management method under the roof cutting gob-side entry retaining coal pillar-free mining condition.
In the figure: 1-air return large lane, 2-track large lane, 3-transport large lane, 4-working face belt crossheading, 5-working face, 6-working face track crossheading, 7-goaf, 8-high-water-material filling wall, 9-goaf high-water-material blocking wall, 10-goaf gas extraction pipe, 11-gob-side entry retaining, 12-adjacent working face open cut hole, 13-adjacent working face air return crossheading, 14-top cutting line, 15-top cutting lane temporary plugging area, 16-top cutting lane permanent spraying plugging area, 17-single hydraulic prop, 18-U-shaped steel, 19-air duct cloth and 20-polyurethane sealing wall.
Detailed Description
The following describes in detail an embodiment of a method for managing a gas and fire composite disaster in a gob side entry retaining face with reference to the accompanying drawings.
Example 1
A specific implementation mode of the goaf gas and natural ignition composite disaster treatment method under the condition of filling gob-side entry retaining coal pillar-free mining.
As shown in fig. 1 and 2:
s1, two adjacent working faces are excavated.
S2, when the working face is mined, a gob-side entry retaining filling technology is adopted to pour the high-water material filling wall 8 along with the advancing of the working face, and the construction distance of the high-water material filling wall 8 is close to the advancing distance of the working face.
And S3, a Y-shaped ventilation mode that air is fed in through a working face belt gate way 4 and a working face track gate way 6 and is returned along a gob-side entry retaining 11 is adopted in the recovery process.
S4, after the working face is mined by L/2 length (L: the length of the closed partition subarea of the goaf) through self-open cutting, the goaf gas extraction pipe 10 is buried in the goaf behind the working face hydraulic support along the inclination.
And S5, after the working face is mined for L length by self-open hole cutting, filling high-water material behind the hydraulic support to form a goaf high-water material blocking wall 9.
And S6, constructing a high-water material blocking wall 9 in the goaf on the hydraulic support every L distance to divide the goaf into a plurality of independent and relatively closed areas.
S7, embedding a goaf gas extraction pipe 10 in the middle of two adjacent high-water material blocking walls 9 along the inclination direction.
And S8, after a relatively closed area is formed between the high-water material blocking wall 9 and the high-water material filling wall 8, extracting the gas of the buried pipe in the goaf.
S9 repeats this operation thereafter until face extraction is complete.
Example 2
The method is a concrete implementation mode of a goaf gas and natural ignition composite disaster treatment method under the condition of roof-cutting gob-side entry retaining coal pillar-free mining.
As shown in fig. 3 and 4:
s1, two adjacent working faces are excavated.
And S2, before stoping, constructing a constant-resistance large-deformation anchor cable in advance in the roadway to reinforce the roadway, constructing bidirectional energy-gathered blasting holes along the roadway, and performing presplitting blasting in front of a working face to form a top cutting line 14 for cutting off a top plate. After the advance kerf is completed, the face begins to advance.
S3, in the working face advancing process, in the top-cutting roadway-forming temporary plugging area 15, a single hydraulic prop 17 and U-shaped steel 18 are combined in time to support a stop lever, and air duct cloth 19 is laid between the stop lever support and the goaf to temporarily seal the goaf.
And S4, in the process of pushing the working face, permanently spraying the plugging area 16 in the roof cutting and roadway forming process, and performing polyurethane spraying plugging on the gob-side roadway retaining side to form a polyurethane sealing wall body 20.
And S5, in the recovery process, a Y-shaped ventilation mode that air is fed into a working surface belt gate way 4 and a working surface track gate way 6 and is returned along a gob-side entry retaining 11 is adopted.
S6, after the working face is mined by L/2 length (L: the length of the closed partition subarea of the goaf) from the open cutting hole, the goaf gas extraction pipe 10 is buried in the goaf behind the working face hydraulic support along the inclination direction.
And S7, after the working face is mined for L length by self-open hole cutting, filling high-water material behind the hydraulic support to form a goaf high-water material blocking wall 9.
And S8, constructing a gob high-water material blocking wall 9 on the hydraulic support every L distance to divide the gob into a plurality of independent and relatively closed areas.
S9, embedding a goaf gas extraction pipe 10 in the middle of two adjacent high-water material blocking walls 9 along the inclination.
And S10, after a relatively closed area is formed between the high-water material blocking wall 9 and the polyurethane sealing wall body 20, extracting the gas of the buried pipe in the goaf.
S11 repeats this operation thereafter until face extraction is complete.
Finally, it should be noted that: the above description is only for the purpose of illustrating the present invention and is not to be construed as limiting the scope of the present invention, which is intended to cover all modifications, improvements and equivalents within the spirit and scope of the present invention.
Claims (6)
1. A gob gas and natural ignition composite disaster treatment method for a gob side entry retaining working face is characterized by comprising the following steps: constructing a gob-side entry retaining on one side of the goaf to realize gob-side entry retaining coal pillar-free mining, and adopting a Y-shaped ventilation mode of belt crossheading, track crossheading air intake and gob-side entry retaining air return on a gob-side entry retaining coal pillar-free mining working face; after the working face is pushed forward by a distance L, a goaf high-water material blocking wall is constructed behind the hydraulic support to divide the goaf into a plurality of independent and relatively closed areas; when the working face is pushed to the middle position of the two blocks of high-water-material blocking walls, gas extraction pipes are buried in the goaf along the inclination, and after the relatively closed area is formed, the gas extraction pipes in the goaf are buried.
2. The gob-side entry retaining working face goaf gas and natural fire composite disaster treatment method according to claim 1, characterized by comprising the following steps: the gob-side entry retaining comprises a filling gob-side entry retaining or a cut-top gob-side entry retaining.
3. The gob gas and natural ignition composite disaster treatment method according to claim 1, characterized in that: the spacing distance L of the high-water material blocking walls is determined by the following method:
L=aVTwherein, in the process,V: working face propulsion speed, m/day;T: spontaneous ignition of coal seamsPeriod, day;a: and the safety coefficient ranges from 0.7 to 0.9.
4. The gob gas and natural ignition composite disaster treatment method according to claim 1, characterized in that: the buried gas extraction pipe extends into the gob-side entry retaining and is merged into a goaf gas extraction main pipeline in the gob-side entry retaining, the buried gas extraction pipe is fully distributed with a plurality of open pores along the way, and the aperture of the open pores is increased along with the increase of the distance from the gob-side entry retaining.
5. The gob-side entry retaining working face goaf gas and natural fire composite disaster treatment method according to claim 2, characterized in that: and (3) filling the gob-side entry retaining without coal pillar mining, wherein when the working face is mined, a gob-side entry retaining filling technology is adopted to pour the high-water material filling wall along with the advancement of the working face, and the construction distance of the high-water material filling wall is close to the advancement distance of the working face.
6. The gob gas and natural ignition composite disaster treatment method according to claim 2, characterized in that: performing non-coal-pillar mining on a cut-top gob-side entry retaining, (1) before stoping, constructing a constant-resistance large-deformation anchor cable in advance in the roadway to reinforce the roadway, constructing bidirectional energy-gathered blasting holes along the roadway, performing presplitting blasting in front of a working face to form a cut-top line for cutting off a top plate, and after the advance cutting is finished, starting to advance the working face;
(2) In the working face advancing process, in a temporary blocking area of a roof cutting and roadway forming, a single hydraulic prop and U-shaped steel are combined to support a stop lever, and air duct cloth is laid between the stop lever support and a goaf to temporarily close the goaf;
(3) And in the working face propelling process, permanently spraying a plugging area in a roof cutting and roadway forming process, and performing polyurethane spraying plugging on the gob-side roadway retaining side to form a polyurethane sealing wall.
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| CN202110962202.4A CN113550782B (en) | 2021-08-20 | 2021-08-20 | Gob-side entry retaining working face goaf gas and natural ignition composite disaster treatment method |
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| CN202110962202.4A CN113550782B (en) | 2021-08-20 | 2021-08-20 | Gob-side entry retaining working face goaf gas and natural ignition composite disaster treatment method |
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| CN116464445B (en) * | 2023-04-13 | 2023-10-20 | 中煤科工集团沈阳研究院有限公司 | Mining disaster treatment method for ultra-thin coal seam protection layer |
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| CH403346A (en) * | 1963-03-29 | 1965-11-30 | Balzers Hochvakuum | Method for ongoing remote monitoring of the air composition in at least one mine tunnel and arrangement for carrying out the method |
| CN201232572Y (en) * | 2008-07-14 | 2009-05-06 | 义马煤业(集团)有限责任公司 | Coal mine tunnel goaf fire wall |
| CN102011588A (en) * | 2010-11-30 | 2011-04-13 | 淄博市王庄煤矿 | House pillar type cutting and filling method of medium coal seam for controlling movement deformation of overlying rock |
| CN102606171A (en) * | 2012-03-29 | 2012-07-25 | 王晓利 | Gob-side entry retaining method for pouring spacing concrete walls in tunnel of advanced highwall |
| CN102720535A (en) * | 2012-06-06 | 2012-10-10 | 旬邑虎豪黑沟煤业有限公司 | Method for preventing goaf air leakage during soft rock crack development coal seam mining of coal mine |
| CN103174451A (en) * | 2013-01-08 | 2013-06-26 | 李继水 | Fire prevention and extinguishing technology for high-gas-content fully mechanized caving face coal seam prone to spontaneous combustion and in suspension state |
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