CN102900460A - Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam - Google Patents

Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam Download PDF

Info

Publication number
CN102900460A
CN102900460A CN2012104372305A CN201210437230A CN102900460A CN 102900460 A CN102900460 A CN 102900460A CN 2012104372305 A CN2012104372305 A CN 2012104372305A CN 201210437230 A CN201210437230 A CN 201210437230A CN 102900460 A CN102900460 A CN 102900460A
Authority
CN
China
Prior art keywords
coal
heading
slot hole
layer
seam
Prior art date
Application number
CN2012104372305A
Other languages
Chinese (zh)
Other versions
CN102900460B (en
Inventor
林柏泉
翟成
沈春明
张连军
高亚斌
Original Assignee
中国矿业大学
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 中国矿业大学 filed Critical 中国矿业大学
Priority to CN201210437230.5A priority Critical patent/CN102900460B/en
Publication of CN102900460A publication Critical patent/CN102900460A/en
Application granted granted Critical
Publication of CN102900460B publication Critical patent/CN102900460B/en

Links

Abstract

The invention discloses a method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on a soft and high-outburst coal seam, and in particular is applied to quick tunneling in a coal seam which is high in outburst danger and a laneway is difficult to support in a coal mine. The method comprises the following steps of: forming a network type fractured net by high-pressure jet flow seam cutting, pressure relief and permeability enhancement technologies, and enhancing an effect of extracting strip-type coal seam gas on a coal laneway subjected to through-going drilling and pre-extraction; and forming a network type filling region by pressing and injecting filling materials, so that the strength and stress distribution of a coal body are improved, the coal laneway is easy to maintain in the tunneling process, a phenomenon that the gas rushes out of a tunneled laneway is avoided, gas accidents are eliminated in the tunneling process, and an aim of safely and quickly tunneling the laneway is fulfilled.

Description

Anti-reflection and the speedy drivage method of layer slot release is worn in the prominent coal seam of soft height
Technical field
The present invention relates to a kind of speedy drivage method, especially a kind ofly be applicable to that strong outburst hazard is arranged in the colliery, the prominent coal seam of soft height in supporting difficulty coal seam wears the anti-reflection and speedy drivage method of layer slot release.
Background technology
The exploitation in the prominent coal seam of soft height is accompanied by a large amount of Gas, and outstanding threat is larger, and the soft coal roadway support difficulty that causes of ature of coal, seriously restricts mine safety and produces fast.At present; in the time of can't exploiting topping; mainly by taking out in advance the gas problem in the tunneling process of the high prominent coal seam of coal-bed gas solution; but; conventional gas pumping method exists single hole gas pumping effective range little; the drilling construction workload is large, and extraction efficient deficiency on the low side, can't effectively solve the gas hazard in the tunneling process.Because ature of coal is soft and pressure is larger in the coal road tunneling process, roadway maintenance is very difficult, wastes a large amount of manpower and materials, affects programming, causes debalance of preparation and winning work.
Summary of the invention
Technical problem: the objective of the invention is for the problem that exists in the prior art, provide the prominent coal seam of a kind of soft height to wear the anti-reflection and speedy drivage method of layer slot release, by adopting the anti-reflection technology of base plate layer-through drilling high-pressure spray slot release, form the network type fracture network, strengthen the extracting result that layer-through drilling is taken out coal road band coal-bed gas in advance; And by the pressure injection filler, form the network type filling area, the Strenth and stress of coal body distributes around the heading to improve, make that maintenance in the coal road tunneling process becomes easily, eliminate the Gas Disaster in the tunneling process, thereby realize safely and fast driving.
Technical scheme: the anti-reflection and speedy drivage method of layer slot release is worn in the prominent coal seam of soft height of the present invention: be included in and move towards the cloth bottom set along work plane in the seat earth rock stratum and take out the lane, take out the end of at and to arrange drill site in the lane, take out the end of from each drill site in lane and wear a layer slot hole to the construction of coal seam direction, until pass till the coal seam, to carrying out the high-pressure hydraulic slot in the coal seam, implement afterwards gas pumping; Characterized by further comprising following steps:
A, take out at the described end that arrangement pitch is a plurality of drill sites of 6 ~ 8m in the lane, each drill site is arranged layer slot hole of wearing of 5 ~ 7 linear distributions in the coal seam, and the whole pitch of holes of wearing layer slot hole is 6 ~ 8m;
B, before the heading digging time 30 ~ 50 days, row near pre-pick both sides, heading position is worn a layer slot hole stop gas pumping, wear in layer slot hole successively pressure injection filler by grouting pump to a row who stops gas pumping, the coal body of pre-pick heading both sides is reinforced;
Gas pumping is continued in layer slot hole of wearing of c, not filling;
D, before the heading digging time 5 ~ 7 days test to the gas pumping effect, reach " control coal and Gas Outburst regulation " requirement after, can tunnel according to a conventional method heading in the heading time of digging;
E, in driving heading process, continue to wear in layer slot hole successively pressure injection filler to the row near pre-pick both sides, heading position, two rows that guarantee successively filling wear a layer slot hole site and answer the advance development head to be not less than 50m.
Described each drill site is worn layer number in slot hole according to seam inclination and is worn layer radius of influence in slot hole and determine.
When described heading began to tunnel, coal body was reinforced distance and is needed to surpass 50m.
Beneficial effect: it is anti-reflection that the present invention carries out release by mine floor rock gangway layer-through drilling inner high voltage jet slot to the prominent coal seam of height, improve layer-through drilling and take out in advance the extracting result of coal road band coal-bed gas, eliminate the high gas gradient in the coal seam, reduce the gas emission in the heading tunneling process, improve the heading driving speed; And by the pressure injection filler, form the network type filling area, increase coal mass strength, improve the supporting condition of coal road driving, reduce coal road two and help gas gushing out to digging laneway, when eliminating high prominent coal road driving outburst hazard, solved the problem of coal roadway support difficulty, greatly improved the speed of the prominent Coal roadway driving of soft height.The present invention can make the prominent coal bed gas extraction concentration of soft height improve 10 ~ 15%, and pre-pumping rate improves 25%, and every hole coal output reaches more than 3 tons; Take out in advance the drilling hole amount that needs and reduce 20% ~ 30%, take out in advance the time decreased 20% that needs; Has fabulous promotional value.
Description of drawings
Fig. 1 is the prominent coal seam speedy drivage structural representation of the soft height of the present invention;
Fig. 2 is the A-A generalized section of Fig. 1;
Among the figure: the 1-coal seam, the 2-heading is taken out the lane at the bottom of the 3-, and 4-wears a layer slot hole, 5-network type filling area, the side outline line is controlled distance outward on the H1-tunnel, and the side outline line is controlled distance, α-seam inclination outward under the H2-tunnel.
The specific embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are further described:
As shown in Figure 1, anti-reflection and the speedy drivage method of layer slot release is worn in the prominent coal seam of soft height of the present invention, at first according to looking into the geological information parameter: coal seam thickness, seam inclination α, bearing, gas parameter, hydrologic regime and other have the parameter of requirement in construction, formulate detailed embodiment.Carry out pre-implementation preparatory work, consider to process the hazards such as crack, tomography, water.In 1 floor strata of coal seam, move towards the cloth bottom set along work plane and take out lane 3, determine the radius of influence in slot hole by the slot test; Take out the end of at after finishing in the lane and arrange a drill site every 6 ~ 8m, each drill site arranges 5 ~ 7 and wears a layer slot hole 4, and the slot hole is linear distribution in the coal seam, and whole pitch of holes is 6 ~ 8m.The radius of influence according to seam inclination α and slot hole, determine the number in each drill site slot hole, control distance H 1 outside the tunnel side outline line of the seam inclination α of its medium dip, high-dipping between 25o to 90o and be at least 20m, the side outline line is controlled distance H 2 outward and is at least 10m under the tunnel, controls outside the tunnel side outline line of the seam inclination α of gentle dip, nearly level between 0o to 25o to control distance H 2 outside the side outline line under distance H 1 and the tunnel and be at least 15m.Be gentle dip or flat seam such as the coal seam, heading 2 wide 4m, the slot hole radius of influence is 3.7m, the distance that then need control is 34m, arrange that wearing a layer slot hole 4 for 5 can control 37m, therefore command range arranges that greater than 34m wearing a layer slot hole 4 for 5 gets final product (arrange 1 in the heading 2, its upper and lower side respectively arranges 2); Be inclination or half-edge coal seam such as the coal seam, heading 2 wide 4m, the slot hole radius of influence is 3.3m, the distance that then need control is 34m, arrange that wearing a layer slot hole 4 for 6 can control 39.6m, command range is greater than 34m, arranges that therefore wearing a layer slot hole 4 for 6 get final product that (layout is 1 in the heading 2, side arranges 3 on it, and lower side arranges 2).Take out in each drill site in lane 3 to the coal seam construction of 1 direction the end of from and wear a layer slot hole 4, until pass till the coal seam 1, to carrying out the high-pressure hydraulic slot in the coal seam 1, implement afterwards gas pumping; Heading 2 diggings before the time 30 ~ 50 days, row near pre-pick both sides, heading 2 position is worn a layer slot hole 4 stop gas pumping, wear in layer slot hole 4 successively pressure injection filler by grouting pump to a row who stops gas pumping, coal body to pre-pick heading both sides is reinforced, other not filling wear layer slot hole 4 and continue mash gas extractions, after filler solidifies, form network type filling area 5 in heading 2 both sides, as shown in Figure 2, network type filling area 5 can increase coal mass strength, improve stress in coal bed and distribute, stop simultaneously the gas in 5 outsides, network type filling area to be gushed out to heading 2 pre-pick positions.Before the heading digging time 5 ~ 7 days, the gas pumping effect is tested, after reaching " control coal and Gas Outburst regulation " and requiring, tunnel according to a conventional method heading 2 in the 2 digging times of heading, coal body was reinforced distance and was needed above 50m this moment.In driving heading 2 processes, continue to wear in layer slot hole 4 successively pressure injection filler to the row near pre-pick both sides, heading 2 position, two rows that guarantee successively filling wear layer 4 position, slot hole and answer the advance development head to be not less than 50m.

Claims (3)

1. the anti-reflection and speedy drivage method of layer slot release is worn in the prominent coal seam of soft height, be included in and move towards the cloth bottom set along work plane in the floor strata of coal seam (1) and take out lane (3), take out layout drill site in the lane (3) end of at, take out in each drill site in lane (3) to the coal seam construction of (1) direction the end of from and wear a layer slot hole (4), until pass till the coal seam (1), to carrying out the high-pressure hydraulic slot in coal seam (1), implement afterwards gas pumping; Characterized by further comprising following steps:
A, take out at the described end that arrangement pitch is a plurality of drill sites of 6 ~ 8m in the lane (3), each drill site is arranged layer slot hole (4) of wearing of 5 ~ 7 linear distributions in coal seam (1), and wearing layer whole pitch of holes in slot hole (4) is 6 ~ 8m;
B, in heading (2) the digging time front 30 ~ 50 days, row near pre-pick heading (2) both sides, position is worn a layer slot hole (4) stop gas pumping, wear in layer slot hole (4) successively pressure injection filler by grouting pump to a row who stops gas pumping, the coal body of pre-pick heading (2) both sides is reinforced;
Gas pumping is continued in layer slot hole (4) of wearing of c, not filling;
D, in heading (2) the digging time front 5 ~ 7 days test to the gas pumping effect, reach " control coal and Gas Outburst regulation " requirement after, can tunnel according to a conventional method heading (2) in heading (2) the digging time;
E, in driving heading (2) process, continuation is worn in layer slot hole (4) successively pressure injection filler to the row near pre-pick heading (2) both sides, position, and two rows that guarantee successively filling wear a layer position, slot hole (4) and answer the advance development head to be not less than 50m.
2. the anti-reflection and speedy drivage method of layer slot release is worn in the prominent coal seam of soft height according to claim 1, it is characterized in that: described each drill site is worn layer number in slot hole (4) according to seam inclination α and is worn layer radius of influence in slot hole (4) and determine.
3. described when tunneling according to a conventional method heading (2), the coal body of heading (2) both sides is reinforced distance and is needed to surpass 50m.
CN201210437230.5A 2012-11-06 2012-11-06 Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam CN102900460B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210437230.5A CN102900460B (en) 2012-11-06 2012-11-06 Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210437230.5A CN102900460B (en) 2012-11-06 2012-11-06 Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam

Publications (2)

Publication Number Publication Date
CN102900460A true CN102900460A (en) 2013-01-30
CN102900460B CN102900460B (en) 2014-10-29

Family

ID=47572917

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210437230.5A CN102900460B (en) 2012-11-06 2012-11-06 Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam

Country Status (1)

Country Link
CN (1) CN102900460B (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103291354A (en) * 2013-05-20 2013-09-11 中国矿业大学 Filling and reinforcing method for floor roadway cross-layer pressure-relief borehole
CN103306713A (en) * 2013-05-20 2013-09-18 中国矿业大学 Networking reinforcement method for cross drilling holes of outburst coal seam
CN103510957A (en) * 2013-10-08 2014-01-15 中国矿业大学 Combined rock cross-cut coal uncovering method
CN103510958A (en) * 2013-10-08 2014-01-15 中国矿业大学 Gentle dip super-high seam rock cross-cut coal uncovering method
CN103775121A (en) * 2014-01-20 2014-05-07 中国矿业大学 Hydraulic cutting, U-shaped hole slagging and gas treatment method
CN104314610A (en) * 2014-10-11 2015-01-28 中煤科工集团重庆研究院有限公司 Coal road stripe region burst-preventing method
CN104481540A (en) * 2014-10-08 2015-04-01 六盘水师范学院 Method for controlling multiple coal mining hazards by high level borehole grouting
CN104747072A (en) * 2015-01-12 2015-07-01 徐州博安科技发展有限责任公司 Waterpower drilling, cutting and sewing system
CN104763462A (en) * 2015-04-07 2015-07-08 中国矿业大学 Method for extracting high-pressure hydraulic cave-manufacturing gas from rock roadway crossing hole
CN104912588A (en) * 2015-05-18 2015-09-16 太原理工大学 Spalling permeability increasing method for rapid excavation of underground seam gateway
CN105221182A (en) * 2015-09-21 2016-01-06 河南理工大学 Coal uncovering method under the complex geological condition of pole
CN105298448A (en) * 2015-10-13 2016-02-03 天地科技股份有限公司 Layout method of coal seam gas extraction engineering
CN105909254A (en) * 2016-04-29 2016-08-31 中煤科工集团西安研究院有限公司 Outburst coal seam floor pitch-up through-bed directional hole leading area shield coal roadway driving method
CN106014473A (en) * 2016-02-03 2016-10-12 中国矿业大学(北京) Cross drilling constrained expansion network anti-reflection gas drainage method
CN106567728A (en) * 2015-10-13 2017-04-19 六盘水师范学院 High gas coal seam group base plate drainage and gas extraction system
CN106812551A (en) * 2016-03-30 2017-06-09 六盘水师范学院 A kind of newly-built high gas and outburst mine in mountain area is worn layer and is taken out and speedy drivage system in advance
CN106812532A (en) * 2016-03-30 2017-06-09 六盘水师范学院 A kind of coal petrography of high gas and outburst mine girdle half cuts top tunnel speedy drivage system
CN107121036A (en) * 2017-06-08 2017-09-01 刘冲 Di Chou lanes return air connection lane deep hole blasting method
CN107152303A (en) * 2017-07-05 2017-09-12 安徽理工大学 A kind of low ventilative high gas layer is by the method for the shielding efficient unloading pressure by blasting extraction in lane
CN108590739A (en) * 2018-04-11 2018-09-28 中国平煤神马能源化工集团有限责任公司 A kind of prominent tunnel regionality energy divides source to control anti-burst method
CN108894814A (en) * 2018-06-29 2018-11-27 徐州工程学院 A method of high temperature nitrogen speedy drivage is infused for layer-through drilling
CN110656972A (en) * 2019-10-31 2020-01-07 郑州慧矿智能科技有限公司 Coal roadway stripe coal seam gas extraction method based on controllable shock waves

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101105138A (en) * 2007-08-15 2008-01-16 湖南科技大学 Method for suppressing coal and gas outburst
CN101382073A (en) * 2007-09-29 2009-03-11 永城煤电集团有限责任公司 'Three-soft' low permeability high gas coal seam rapidly digging method
CN101603431A (en) * 2009-07-14 2009-12-16 中国矿业大学 A kind of method for reinforcing outburst-prone coal seam cross-cut coal uncovering
CN102168560A (en) * 2011-03-10 2011-08-31 贵州铸安矿山科技股份有限公司 Displacement crosscut coal uncovering method
CN102748065A (en) * 2012-07-30 2012-10-24 武汉大学 Method for extracting gas of blank zone of working face with large mining length

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101105138A (en) * 2007-08-15 2008-01-16 湖南科技大学 Method for suppressing coal and gas outburst
CN101382073A (en) * 2007-09-29 2009-03-11 永城煤电集团有限责任公司 'Three-soft' low permeability high gas coal seam rapidly digging method
CN101603431A (en) * 2009-07-14 2009-12-16 中国矿业大学 A kind of method for reinforcing outburst-prone coal seam cross-cut coal uncovering
CN102168560A (en) * 2011-03-10 2011-08-31 贵州铸安矿山科技股份有限公司 Displacement crosscut coal uncovering method
CN102748065A (en) * 2012-07-30 2012-10-24 武汉大学 Method for extracting gas of blank zone of working face with large mining length

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
林柏泉: "钻孔割缝网络化增透机制及其在底板穿层钻孔瓦斯抽采中的应用", 《煤炭学报》 *

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103291354B (en) * 2013-05-20 2015-06-10 中国矿业大学 Filling and reinforcing method for floor roadway cross-layer pressure-relief borehole
CN103306713A (en) * 2013-05-20 2013-09-18 中国矿业大学 Networking reinforcement method for cross drilling holes of outburst coal seam
WO2014187171A1 (en) * 2013-05-20 2014-11-27 中国矿业大学 Method for networked reinforcement of cross boreholes of outburst coal seam
CN103291354A (en) * 2013-05-20 2013-09-11 中国矿业大学 Filling and reinforcing method for floor roadway cross-layer pressure-relief borehole
CN103510957A (en) * 2013-10-08 2014-01-15 中国矿业大学 Combined rock cross-cut coal uncovering method
CN103510958A (en) * 2013-10-08 2014-01-15 中国矿业大学 Gentle dip super-high seam rock cross-cut coal uncovering method
CN103510958B (en) * 2013-10-08 2016-08-10 中国矿业大学 A kind of gentle dip super-high seam rock cross-cut coal uncovering
CN103510957B (en) * 2013-10-08 2016-04-20 中国矿业大学 A kind of combined type coal uncovering method
CN103775121A (en) * 2014-01-20 2014-05-07 中国矿业大学 Hydraulic cutting, U-shaped hole slagging and gas treatment method
CN103775121B (en) * 2014-01-20 2015-09-30 中国矿业大学 A kind of hydraulic slotted liner technique U-shaped hole deslagging mash gas harnessing method
CN104481540A (en) * 2014-10-08 2015-04-01 六盘水师范学院 Method for controlling multiple coal mining hazards by high level borehole grouting
CN104314610A (en) * 2014-10-11 2015-01-28 中煤科工集团重庆研究院有限公司 Coal road stripe region burst-preventing method
CN104747072A (en) * 2015-01-12 2015-07-01 徐州博安科技发展有限责任公司 Waterpower drilling, cutting and sewing system
CN104763462A (en) * 2015-04-07 2015-07-08 中国矿业大学 Method for extracting high-pressure hydraulic cave-manufacturing gas from rock roadway crossing hole
CN104912588A (en) * 2015-05-18 2015-09-16 太原理工大学 Spalling permeability increasing method for rapid excavation of underground seam gateway
CN105221182A (en) * 2015-09-21 2016-01-06 河南理工大学 Coal uncovering method under the complex geological condition of pole
CN105221182B (en) * 2015-09-21 2017-11-17 河南理工大学 Coal uncovering method under the complex geological condition of pole
CN105298448A (en) * 2015-10-13 2016-02-03 天地科技股份有限公司 Layout method of coal seam gas extraction engineering
CN105298448B (en) * 2015-10-13 2018-02-13 天地科技股份有限公司 The distribution method of coal bed gas extraction engineering
CN106567728A (en) * 2015-10-13 2017-04-19 六盘水师范学院 High gas coal seam group base plate drainage and gas extraction system
CN106014473A (en) * 2016-02-03 2016-10-12 中国矿业大学(北京) Cross drilling constrained expansion network anti-reflection gas drainage method
CN106812551A (en) * 2016-03-30 2017-06-09 六盘水师范学院 A kind of newly-built high gas and outburst mine in mountain area is worn layer and is taken out and speedy drivage system in advance
CN106812532A (en) * 2016-03-30 2017-06-09 六盘水师范学院 A kind of coal petrography of high gas and outburst mine girdle half cuts top tunnel speedy drivage system
CN105909254A (en) * 2016-04-29 2016-08-31 中煤科工集团西安研究院有限公司 Outburst coal seam floor pitch-up through-bed directional hole leading area shield coal roadway driving method
CN105909254B (en) * 2016-04-29 2018-04-24 中煤科工集团西安研究院有限公司 Projecting coal bed bottom plate, which is faced upward, wears the advanced area cover coal roadway tunneling method of layer directional hole
CN107121036A (en) * 2017-06-08 2017-09-01 刘冲 Di Chou lanes return air connection lane deep hole blasting method
CN107152303A (en) * 2017-07-05 2017-09-12 安徽理工大学 A kind of low ventilative high gas layer is by the method for the shielding efficient unloading pressure by blasting extraction in lane
CN108590739A (en) * 2018-04-11 2018-09-28 中国平煤神马能源化工集团有限责任公司 A kind of prominent tunnel regionality energy divides source to control anti-burst method
CN108894814A (en) * 2018-06-29 2018-11-27 徐州工程学院 A method of high temperature nitrogen speedy drivage is infused for layer-through drilling
CN110656972A (en) * 2019-10-31 2020-01-07 郑州慧矿智能科技有限公司 Coal roadway stripe coal seam gas extraction method based on controllable shock waves

Also Published As

Publication number Publication date
CN102900460B (en) 2014-10-29

Similar Documents

Publication Publication Date Title
Wang Development and prospect on fully mechanized mining in Chinese coal mines
CN106150503B (en) A kind of method that tight roof is administered in hydraulic fracturing
CN103527200B (en) Bottom-column-free sectional Rhombic room afterwards filling mining method
CN102155254B (en) Method for extracting gas in low air permeability coal layer by pulse fracture anti-reflection
CN102704933B (en) Isolated-section grouting filling coal-mining method for mining overburden rock
CN103557002B (en) A kind of mechanized concentrates drop shaft filling-up method
CN101403314B (en) Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique
CN102654049B (en) Porous linear control hydraulic fracturing method
CN101105129B (en) Mining environment reconstructed continuous mining afterwards filling mining method
CN101871347B (en) Mining environment reconstruction layering and striping medium-length hole ore removal mining method
CN102966354B (en) Non-pillar mining method for hard roof coal wall of thick coal seam
CN101915083B (en) Method for extracting coalbed gases from coal mines by upper and lower combination
CN104775819B (en) Deep inclined coal seam mining roadway mine pressure control mining method
CN101832149B (en) Method for extracting coal seam gas by underground heat injection
CN104832178A (en) A layering and partially filling coal mining method of thick seams
CN102220868B (en) Urban shallow buried large-section tunnel five-step excavating method
CN103924975B (en) A kind of for the water-retaining method in coal mining process
CN105317459B (en) A kind of subregion placement method for being used to control tight roof large area caving disaster
CN105587318A (en) Filling mining method for continuous backstoping of gently inclined parallel medium thick ore body group
CN105156085B (en) The coal mine underground coal bed tree-shaped uniform anti-reflection method of drilling composite fracturing
CN108561135B (en) A kind of mechanization stoping method of the suitable unstable middle thickness orebody of low-angle dip country rock
Sotskov et al. Investigation of the rock massif stress strain state in conditions of the drainage drift overworking
CN104895566B (en) A kind of remnant reclaiming mining codes
CN102678120A (en) Method for releasing pressure and removing danger of rock burst
CN202064981U (en) Soft coal layer roadway supporting structure

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant