CN102094669B - Three-dimensional source separated pressure-releasing gas treatment method - Google Patents
Three-dimensional source separated pressure-releasing gas treatment method Download PDFInfo
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- CN102094669B CN102094669B CN2010106043290A CN201010604329A CN102094669B CN 102094669 B CN102094669 B CN 102094669B CN 2010106043290 A CN2010106043290 A CN 2010106043290A CN 201010604329 A CN201010604329 A CN 201010604329A CN 102094669 B CN102094669 B CN 102094669B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010276 construction Methods 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000003245 coal Substances 0.000 abstract description 28
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 abstract 2
- 239000011241 protective layer Substances 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 238000000605 extraction Methods 0.000 description 14
- 239000011435 rock Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Abstract
The invention discloses a three-dimensional source separated pressure-releasing gas treatment method. The method comprises the following steps of: constructing a gas drainage roadway which is parallel to the return air roadway of a coal face on the outer side of the return air roadway; constructing an elevation borehole from the gas drainage roadway to the direction of a roof crack zone of a maiden area which is positioned in front of the open-off cut of the coal face until the roof crack zone is passed through, constructing a depression borehole which passes through a protected layer to the direction of a bottom crack zone until the bottom crack zone is passed through, and connecting the constructed boreholes with gas drainage pipelines for gas drainage; along with the constant development of the coal face, continually constructing gob boreholes from the gas drainage roadway to a gob which is positioned in the back of the open-off cut of the coal face, and connecting the gas drainage pipelines for the gas drainage until the recovery of the coal face is finished. By draining the gas which is discharged in the pressure releasing process of the protected layer from the elevation borehole on the top of the roadway to the depression borehole at the bottom of the roadway, a separation function is realized, pressure-released gas is prevented from flowing into a protective layer working face, a great amount of air flow is prevented from carrying the gas from the gob to an upper corner, and the gas emission amount of the upper corner is reduced.
Description
Technical field
The present invention relates to a kind of three three-dimensional branch source gas pressure relief improvement methods, be particularly useful for that contiguous coal seam gas-bearing capacity is big, a large amount of release and the improvement that causes the topping face gas to transfinite after the release.
Background technology
China buries in the coal seam generally darker, and therefore about 95% mine all adopts pit mining.The coal seam generally has simultaneously; The characteristics that geostatic stress is high, ature of coal is soft, gas permeability is low, gas is difficult for extraction; Gas can not be by smooth extraction before exploitation in the coal seam, causes in the working face extraction process a large amount of release of gas to cause gas exceeding limit, and perhaps the outburst hazard in coal seam can not be eliminated; Thereby cause danger to the colliery safety in production, restrict the production capacity of mine simultaneously.Under the condition of coal seam group, the exploitation topping is the most effective regional gas control measure, and wherein exploiting and going up topping is first-selected measure.Owing to following cover topping release in the topping recovery process discharges a large amount of gas, particularly remarkable when the coal seam spacing is nearer, gas gets into the topping work plane through the crack passage, thereby causes the topping face gas to transfinite in a large number.Owing to leak out in the goaf, upper corner gas transfinites the most easily.
Because after the topping exploitation; Under cover the coal petrography geostatic stress and will be discharged greatly, produce a large amount of secondary interstices, thereby the desorption of mash gas of protected seam discharges down; And pour in the topping work plane through the crack; Goaf characteristics of leaking out are in addition distinguished and admirablely brought gas pressure relief into upper corner, cause the upper corner gas exceeding limit.To clocklike collapse after the topping exploitation and cover country rock on the topping, thereby derive a large amount of cracks, the gas fabulous for gas permeability preserves the zone.A large amount of gas pressure reliefs of following protected seam will be upward through topping and get into and cover country rock top board crack district; And be stored in wherein, during periodic weighting, inside ceiling panel crack, goaf district will be squeezed in the goaf; And cause gas to pour in the topping work plane, cause gas exceeding limit.Need carry out extraction to the gas in the district of top board crack administers for this reason.
Under the condition of last topping exploitation; Must implement the three-dimensional improvement of gas from multi-angle: need be to the gas pressure relief enforcement interception of protected seam down; Also need discharge goaf upper corner gas; Also need the gas in the district of extraction goaf top plate crack simultaneously, the on-the-spot urgent need to the gas pressure relief control measures under this condition.
Summary of the invention
Technical problem: the objective of the invention is to overcome the problem of depositing in the prior art; A kind of three three-dimensional branch source gas pressure relief improvement methods are provided, can under topping production technique condition on the contiguous seams crowd, distribute through the crack district under the last topping mining conditions; Carry out gas control targetedly to different gas sources; Transfinite thereby reduce the topping face gas, improve the work plane condition, realize the safe working of topping work plane.
Technical scheme: three three-dimensional branch source gas pressure relief improvement methods of the present invention comprise the steps:
A. in gas drainage under suction tunnel that parallels with it of construction, the outside, the return aircourse of coal-face;
B. cut the top board fissure zone direction construction elevation angle boring in the territory, unworked country of side at the moment from the gas drainage under suction tunnel to coal-face; Until passing the top board fissure zone; And the angle of depression boring of passing protected seam to floor crack band direction construction; Until passing the floor crack band, each hole of constructing is connected gas drainage under suction pipeline carry out gas drainage under suction;
C, along with the continuous propelling of coal-face, constantly cut the goaf construction goaf boring at a rear to coal-face, and connect the gas drainage under suction pipeline from the gas drainage under suction tunnel, carry out gas drainage under suction through valve control, finish until the coal-face back production.
The distance of described gas drainage under suction tunnel and return aircourse is 3 ~ 8m; The elevation angle of elevation angle boring is 30 ~ 60 °; The angle of depression of angle of depression boring is 15 ~ 70 °; The construction goaf be bored into coal-face cut the eye distance less than 15m.
Beneficial effect: the present invention is through analyzing the regularity of distribution of field, crack, topping exploitation back; Adopt three three-dimensional branch source gas pressure relief improvement methods; From the gas drainage under suction roadway construction base plate boring of offering; Gas to floating after the following protected seam release is implemented interception, stops a part of gas pressure relief to continue to float; Adopt goaf boring simultaneously, change the distinguished and admirable flow direction in goaf, stop gas pressure relief from the goaf upper corner gush out; To the high-order boring of top board fissure zone direction construction, extraction gets into the gas of top board fissure zone from the gas drainage under suction tunnel, hinder this part gas the top board periodic weighting or under conditions such as self diffusion entering topping work plane, cause the upper corner gas exceeding limit.Because the measure of gas control is based on the flowing law design of field, crack and Gas Flow field, therefore can a large amount of gas pressure reliefs of extraction, guarantee gas pressure relief by extraction in advance, reduce the inflow coal-face and cause gas exceeding limit.Can adjust the quantity of extraction boring in the concrete at the scene process of using based on physical condition flexibly, can extraction surpass 70% gas, stop the upper corner gas exceeding limit basically, improve coal mining speed more than 30%.In topping exploitation gas pressure relief is administered; Particularly the topping working thickness less than the girdle condition below the 1.3m under; And under the condition that upper corner gas transfinites easily, can reduce the gas exceeding limit of topping work plane, improve the work plane condition; Realize the safe working of topping work plane, have practicality widely.
Description of drawings
Fig. 1 is three three-dimensional branch source gas pressure relief improvement method sketch mapes of the present invention.
Fig. 2 is the A-A sectional drawing of Fig. 1.
Among the figure: the boring of the 1-elevation angle; The boring of 2-goaf; The boring of the 3-angle of depression; The 4-caving zone; The 5-return aircourse; 6-top board fissure zone; 7-virgin stress district; The 8-topping; The 9-intake; The 10-goaf; 11-floor crack band; The 12-protected seam; Return aircourse, 13-exploiting field; The 14-work plane is cut eye; 15-gas drainage under suction tunnel; 16-exploiting field intake; Territory, 17-unworked country; The 18-coal column.
The specific embodiment
Below in conjunction with in the accompanying drawing embodiments of the invention being done further to describe:
Present embodiment is example with protected seam 12 at the mash gas harnessing method of topping 8 bottom situation, and is as shown in Figure 2.Under the coal seam group condition; Select no coal and gas outburst risk or coal and the less coal seam of gas outburst risk at first to exploit; The coal seam of exploitation is topping 8 earlier; After topping 8 exploitation contiguous coal seam outburst hazard is eliminated or the coal seam that reduces is called protected seam 12, protected seam 12 has and appears at topping 8 tops, also has to appear at topping 8 bottoms.
Shown in Figure 1; Three three-dimensional branch source gas pressure relief improvement methods of the present invention; After at first the work plane in topping 8 was ready to complete, distinguished and admirable intake 16 got into intake 9 from the exploiting field, and the inflow work plane is cut eye 14; The return aircourse, 5 inflow exploiting field 13 through the return aircourse forms ventilation system afterwards.Stay near 5 outsides, return aircourse in the territory, unworked country 17 of coal-face and to establish 3 ~ 8m coal column 18, and the gas drainage under suction tunnel 15 of constructing, its length can not be parallel less than 5, two tunnels, return aircourse; Gas drainage under suction tunnel 15 is 3 ~ 8m with the distance of return aircourse 5; After working face extraction; Work plane cut the eye goaf, 14 rear 10 above since rock mass move difference; Can occur caving zone 4, top board fissure zone 6 and virgin stress district 7 successively, floor crack band 11 and virgin stress district 7 also will appear in goaf 10 below coal and rock successively.Cut eye 14 the place aheads at coal-face; Top board fissure zone 6 directions from 15 tops, gas drainage under suction lane in territory, the unworked country 17 construction elevation angle is 30 ~ 60 ° elevation angle boring 1, until passing top board fissure zone 6, and passes the angle of depression boring 3 of protected seam 12 to the floor crack band 11 directions construction of 15 bottoms, gas drainage under suction lane; Until passing floor crack band 11; Each hole of construction is connected gas drainage under suction pipeline carry out gas drainage under suction, the angle of depression of angle of depression boring 3 is 15 ~ 70 °, through adopt the angle of depression to hole gas that 12 releases of 3 extraction protected seams discharge; Play the partition effect, the work plane that stops gas pressure relief to flow into topping 8 is cut eye 14; Through the goaf 2 extraction goaf gas of holing; Force distinguished and admirable in goaf 10 flow direction change; Cause the part wind circulation to cross goaf boring 2 and be discharged, stops and distinguished and admirablely 10 carry gas and flow into upper corner, minimizing upper corner gas emission from the goaf; Preserve the gas in the top board fissure zone through the elevation angle 1 extraction of holing, hinder this part gas and get into the topping work plane, cause the upper corner gas exceeding limit at the top board periodic weighting or under conditions such as self diffusion.Gap ratio is less when the coal seam, and during like the 5m left and right sides, can select the angle of depression is 15 °, and along with the increase of coal seam spacing, the angle of depression also increases gradually, and the maximum depression is 70 °; Continuous propelling along with coal-face; Constantly cut 10 construction goafs, the goaf boring 2 at eye 14 rears to coal-face from gas drainage under suction tunnel 15, the distance that the boring 2 of construction goaf is cut eye 14 to coal-face is less than 15m, and holed in the goaf 2 to pass coal column 18 entering goafs; In goaf boring 2, the gas drainage under suction pipe is installed; And connect the gas drainage under suction pipeline, and carry out gas drainage under suction through valve control, finish until the coal-face back production.
Claims (4)
1. one kind three three-dimensional branch source gas pressure relief improvement methods is characterized in that comprising the steps:
A. in gas drainage under suction tunnel (15) that parallels with it of construction, the outside, the return aircourse (5) of coal-face;
B. cut top board fissure zone (6) the direction construction elevation angle boring (1) in the territory, unworked country (17) in eye (14) the place ahead to coal-face from gas drainage under suction tunnel (15); Until passing top board fissure zone (6); And the angle of depression boring (3) of passing protected seam (12) to floor crack band (11) direction construction; Until passing floor crack band (11), each hole of constructing is connected gas drainage under suction pipeline carry out gas drainage under suction;
C, along with the continuous propelling of coal-face; Constantly cut goaf (10) the construction goaf boring (2) at eye (14) rear to coal-face from gas drainage under suction tunnel (15); And connection gas drainage under suction pipeline; Carry out gas drainage under suction through valve control, finish until the coal-face back production.
2. three three-dimensional branch source gas pressure relief improvement methods according to claim 1 is characterized in that: described gas drainage under suction tunnel (15) is 3 ~ 8m with the distance of return aircourse (5).
3. three three-dimensional branch source gas pressure relief improvement methods according to claim 1 is characterized in that: the elevation angle of said elevation angle boring (1) is 30 ~ 60 °; The angle of depression of angle of depression boring (3) is 15 ~ 70 °.
4. three three-dimensional branch source gas pressure relief improvement methods according to claim 1 is characterized in that: the distance that described goaf boring (2) is cut (14) to coal-face is less than 15m.
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| CN2010106043290A CN102094669B (en) | 2010-12-24 | 2010-12-24 | Three-dimensional source separated pressure-releasing gas treatment method |
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| CN2010106043290A CN102094669B (en) | 2010-12-24 | 2010-12-24 | Three-dimensional source separated pressure-releasing gas treatment method |
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| CN102094669A CN102094669A (en) | 2011-06-15 |
| CN102094669B true CN102094669B (en) | 2012-11-28 |
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Cited By (1)
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| CN106246222A (en) * | 2015-06-12 | 2016-12-21 | 山西潞安环保能源开发股份有限公司常村煤矿 | A kind of visual inspection method of coal-face roof fracture band evolution Feature |
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| CN102444402B (en) * | 2011-12-30 | 2013-11-20 | 中国矿业大学 | Method for regionally preventing coal and gas outburst |
| CN102587960A (en) * | 2012-03-22 | 2012-07-18 | 中国矿业大学 | Arrangement method of high gas coal seam extraction working face roadway |
| CN102748064A (en) * | 2012-07-19 | 2012-10-24 | 大同煤矿集团有限责任公司 | Large-mining-height fully-mechanized caving face gas control method |
| CN104564127A (en) * | 2015-02-12 | 2015-04-29 | 湖南科技大学 | Method for extracting gas in coal seams under overlying hung thick igneous rocks |
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| CN107100667A (en) * | 2017-06-19 | 2017-08-29 | 中国矿业大学(北京) | A kind of U-shaped ventilation operation face goaf is servo-actuated gas pumping method |
| CN112761713B (en) * | 2021-01-29 | 2022-07-05 | 太原理工大学 | Safe and long-acting gas extraction method for goaf of stoping working face of high-gas mine |
| CN114893242A (en) * | 2022-03-24 | 2022-08-12 | 太原理工大学 | Method for preventing upper corner gas from exceeding limit in source-dividing and flow-stopping three-dimensional extraction |
| CN117027921B (en) * | 2023-09-28 | 2023-12-12 | 太原理工大学 | Method for preventing influence of high-gas goaf on nearby working surface |
| CN117266855B (en) * | 2023-11-23 | 2024-01-19 | 太原理工大学 | Pressure relief and permeability improvement method and system for ultrathin layered mining of coal seam |
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