CN104712358A - Coal seam group with high gas content pressure relief and co-mining method based on gob-side entry retaining of working face of first mining total rock pressure relief - Google Patents
Coal seam group with high gas content pressure relief and co-mining method based on gob-side entry retaining of working face of first mining total rock pressure relief Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 86
- 238000005065 mining Methods 0.000 title claims abstract description 33
- 239000003245 coal Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005086 pumping Methods 0.000 claims description 19
- 238000005553 drilling Methods 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 13
- 238000009412 basement excavation Methods 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 4
- 230000005012 migration Effects 0.000 claims description 4
- 238000013508 migration Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 4
- 230000000717 retained effect Effects 0.000 abstract 2
- 238000003795 desorption Methods 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009423 ventilation Methods 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
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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Abstract
The invention discloses a coal seam group with high gas content pressure relief and co-mining method based on gob-side entry retaining of a working face of first mining total rock pressure relief. When a first mining pressure relief coal seam can not be selected, the coal and rock seams are moved and broken through the working face of first mining total rock pressure relief, an upper covered coal seam with high gas and a lower covered coal seam which high gas are subjected to pressure relief and swollen, fractures of a surrounding rock mass are developed, the gas permeability is increased, the gas is subjected to desorption and transportation, and finally a top plate pressure relief annular fracture area and a bottom plate pressure relief annular fracture area are generated. To create a favorable stress environment of retained roadway surrounding rock, retained roadway mining empty side cantilever crest truncation is conducted to first advance mining drill site toward and backward the working face in a bi-directional mode, according to the top plate lithologic characters, the first advance is subjected to top plate deep hole pre-splitting and cover caving so that it is guaranteed that the top plate is sufficiently collapsed to fill a worked out section. By means of the method, the prominent problems of exhausting and mining of coal seam group pressure relief gas and safe mining when the first mining pressure relief coal seam of the coal seam group with high gas content is difficult to select are solved.
Description
Technical field
The present invention relates to a kind of colliery high gas layer group exploitation method, specifically one adopts total rock release work plane gob side entry retaining extraction high gas layer group gas pressure relief, to realize the method to high gas layer group safety and high efficiency by head.
Background technology
China's Main Coalfields complex geologic conditions, coal seam gas-bearing capacity is high, and permeability is low.And practice shows, once coal seam is subject to exploiting the disturbance caused, even the coal seam that permeability is very low, its permeability also will increase decades of times to hundreds of times, for gas migration and extraction create conditions.This gas pumping emphasis just determining China should adopt initiatively release extraction based on down-hole.
Be in the application for a patent for invention of 200810023383.9 at application number, inventors herein propose the technical scheme of one " high gas layer group exploits gob-side entry retaining Y-type ventilation pressure relief gas pumping mining method ".The object of this technical scheme is the effective Utilizing question of exploitation and gas in order to solve high gas layer group, adopt by head the coal rock layer that pressure released seam causes to move and the top plate pressure relief cracked district, the base plate release cracked district that produce, in gob side entry retaining, cloth is set up to top plate pressure relief cracked district mash gas pumping drilling and carries out extraction to base plate release cracked district mash gas pumping drilling to desorb free gas down respectively.Although when high gas layer group has suitable head to adopt pressure released seam, this invention can well solve the mining problem of high gas layer group, when high gas layer group does not have suitable head to adopt pressure released seam, program application difficult.Especially, when the gas of the first mining height gassy seam of pump drainage, efficiency is low, and gas exhaust is not thorough, can not reach below safety value, is easy to the serious accident such as gas explosion or coal and gas prominent occurs, there is huge potential safety hazard.Therefore under above-mentioned engineering specifications, the mining problem of high gas layer group is not well solved.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of high gas layer group release mining method altogether adopting total rock release work plane gob side entry retaining based on head, choose at need when the head of high gas layer group adopts pressure released seam, adopt total rock release work plane by head and realize safe working.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A kind of high gas layer group release mining method altogether adopting total rock release work plane gob side entry retaining based on head, adopting pressure released seam by head causes coal rock layer to move to produce top plate pressure relief cracked district and base plate release cracked district, and in gob side entry retaining, cloth is set up to top plate pressure relief cracked district mash gas pumping drilling and carries out extraction to base plate release cracked district mash gas pumping drilling to desorb free gas down respectively; Adopting when pressure released seam cannot be chosen at head (or chooses at need, such as adjacent coal bed hangs down and does not possess mining conditions etc. apart from excessive, the projecting coal bed group of high methane), adopt total rock release work plane by head cause coal rock layer to move and destroy, on cover high gas layer and the high gas layer that underlies unloads compression swelling, enclose rock mass fracture growth, gas permeation rate increases and desorb migration, forms top plate pressure relief cracked district and base plate release cracked district.
Adopt total rock release work plane by head cause coal rock layer to move and destroy, concrete grammar is: at advanced total rock work plane excavation drill site, and arranges in drill site and meet to working face open-off cut crown drill hole and working face open-off cut crown drill hole dorsad, is out of shape to control gob side entry retaining; According to the lithologic character above covering high gas layer, caving boring is set at advanced total rock work plane, Deephole pre-splitting blasting is implemented to ensure that top board is fully caving and fills goaf to caving boring; Simultaneously construct filled wall realize gob side entry retaining in the sky side of adopting of total rock work plane.
Concrete, in described high gas layer group, the vertical distance of arbitrary neighborhood coal rock layer is 120 ~ 150m; When selecting head to adopt total rock release work plane, need to take into full account that surrounding rock structure, top board are across emitting and base plate release feature, and it is 30 ~ 90m that head adopts the vertical distance that total rock release work plane distance above covers high gas layer (above covering pre-pressure released seam), the underlie vertical distance of high gas layer (underlie pre-pressure released seam) of distance is 20 ~ 60m.
Concrete, when selecting head to adopt total rock release work plane, require: the formation hardness Protodyakonov coefficient that head adopts total rock release work plane is f≤7, work plane arrangement length is 150 ~ 250m, propelling length is 1000 ~ 2500m, and mining is highly 1.3 ~ 3.5m, work plane inclination angle≤20 °.
Beneficial effect: the high gas layer group release mining method altogether adopting total rock release work plane gob side entry retaining based on head provided by the invention, to compare prior art, there is following advantage: 1, adopt pressure released seam at head and choose at need, adopt total rock release work plane by head cause coal rock layer to move and destroy, the scope of application is wider, and the layer position of release layer is chosen also more flexible; 2, thoroughly solve and adopt pressure released seam at high gas layer cluster and choose at need, choosing and this outstanding problem of coal seam group safe working of topping; 3, this case relief range is large, by suitable mining height, can to the coal seam above covering more than 100m, and sufficient release mash gas extraction is carried out in the coal seam of below the 50m that underlies; 4, this case is on the basis analyzing gob side entry retaining surrounding rock structure motion feature, a kind of Roof Control method impelling the abundant release of gob side entry retaining is proposed, employing Advance presplitting is holed, fully loosen wall outer side main roof strata, make always to withstand on wall outer side disrumpent feelings, eliminate large span and hang top and the impact of revolution sinking on gob side entry retaining country rock, fundamentally significantly alleviate gob side entry retaining pressure from surrounding rock, optimize and stay lane regional stress field, reduce gob side entry retaining overlying rock to the action time of country rock, reach the object controlling to stay lane to be out of shape; 5, this case feasibility is strong, and technique is simple; Existing coal-winning machine, hydraulic support, drag conveyor etc. are comprehensive adopt corollary equipment can meet intensity relatively rocklet work plane carry out comprehensive mechanization back production.
Accompanying drawing explanation
Fig. 1 is gas pumping method schematic diagram of the present invention;
Fig. 2 is that the present invention cuts crown drill hole and schematic diagram is arranged in caving boring;
Fig. 3 is that the present invention cuts crown drill hole layout sectional drawing;
Fig. 4 is that sectional drawing is arranged in caving of the present invention boring;
In figure: 1-covers high gas layer, 2-head adopts release rock stratum, and 3-underlies high gas layer, 4-track lane, 5-filled wall, 6-unloads line ball, 7-break line, 8-goaf, 9-is upper to top plate pressure relief cracked district mash gas pumping drilling, to base plate release cracked district mash gas pumping drilling under 10-, 11-transportation roadway, 12-drill site, 13-is working face open-off cut crown drill hole dorsad, 14-meets to working face open-off cut crown drill hole, and 15-caving is holed, and 16-head adopts total rock release work plane.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
A kind of high gas layer group release mining method altogether adopting total rock release work plane gob side entry retaining based on head, adopting pressure released seam by head causes coal rock layer to move to produce top plate pressure relief cracked district and base plate release cracked district, and in gob side entry retaining, cloth is set up to top plate pressure relief cracked district mash gas pumping drilling and carries out extraction to base plate release cracked district mash gas pumping drilling to desorb free gas down respectively, head adopt pressure released seam cannot choose time, adopt total rock release work plane by head cause coal rock layer to move and destroy, on cover high gas layer and the high gas layer that underlies unloads compression swelling, enclose rock mass fracture growth, gas permeation rate increases and desorb migration, form top plate pressure relief cracked district and base plate release cracked district, be specially: adopt total rock release work plane by head and cause coal rock layer to move and destroy, concrete grammar is: at advanced total rock work plane excavation drill site, and arrange in drill site and meet to working face open-off cut crown drill hole and working face open-off cut crown drill hole dorsad, to control gob side entry retaining distortion, according to the lithologic character above covering high gas layer, caving boring is set at advanced total rock work plane, Deephole pre-splitting blasting is implemented to ensure that top board is fully caving and fills goaf to caving boring, construct filled wall to realize gob side entry retaining in the sky side of adopting of total rock work plane simultaneously.
Concrete, in described high gas layer group, the vertical distance of arbitrary neighborhood coal rock layer is 120 ~ 150m; When selecting head to adopt total rock release work plane, need to take into full account that surrounding rock structure, top board are across emitting and base plate release feature, and it is 30 ~ 90m that head adopts the vertical distance that total rock release work plane distance above covers pre-pressure released seam, the underlie vertical distance of pre-pressure released seam of distance is 20 ~ 60m.
Concrete, when selecting head to adopt total rock release work plane, require: the formation hardness Protodyakonov coefficient that head adopts total rock release work plane is f≤7, work plane arrangement length is 150 ~ 250m, propelling length is 1000 ~ 2500m, and mining is highly 1.3 ~ 3.5m, work plane inclination angle≤20 °.
Below in conjunction with embodiment, implementation process of the present invention is made further instructions.
Adopt a high gas layer group release mining method altogether for total rock release work plane gob side entry retaining based on head, in the specific implementation, comprise the steps:
(1) according to the actual composite columnar section in colliery, consider the factor such as layer position, hardness of each rock stratum, choose the rock stratum being applicable to carrying out total rock working face mining and adopt total rock release rock stratum as head;
(2) adopt the height of total rock release rock stratum, hardness, work plane arrangement length, work plane inclination angle according to head, supporting choosing is carried out to required coal-winning machine, hydraulic support, conveyer etc.;
(3) form head according to the arrangement parameter of work plane and adopt total rock release work plane;
(4) in advance of the face process, half original position is used to stay lane method to carry out gob side entry retaining along track lane;
(5) at the advanced total rock work plane excavation drill site by back production side, drill site spacing 40 ~ 60m, drill site is of a size of: wide 4 ~ 6m, dark 3 ~ 5m, high 2 ~ 3.5m; For each drill site, setting is met to working face open-off cut crown drill hole and working face open-off cut crown drill hole dorsad, meet to working face open-off cut crown drill hole and dorsad working face open-off cut crown drill hole be all no less than 2 groups, meet to working face open-off cut crown drill hole group with meet to group position, working face open-off cut crown drill hole parallel, working face open-off cut crown drill hole is with group position, working face open-off cut crown drill hole is parallel dorsad dorsad; To meet to working face open-off cut crown drill hole group and dorsad working face open-off cut crown drill hole group be referred to as and cut crown drill hole group, crown drill hole group is cut for each, often group is no less than 3 and cuts crown drill hole, and the crown drill hole of cutting often in group is arranged in one plane in fanning scattering, the level angle cutting crown drill hole is not more than 10 °, adjacent 3 ~ 4 °, level angle interval of cutting crown drill hole, the elevation angle of cutting crown drill hole is 15 ~ 25 °, adjacent 4 ~ 5 °, interval, the elevation angle of cutting crown drill hole; The vertical distance of cutting the powder charge section top height distance top board in crown drill hole is greater than 3m, and sealing of hole segment length is greater than 5m; Explosion is implemented to cutting crown drill hole at advanced total rock work plane front 10 ~ 40m;
(6) caving boring is set at advanced total rock work plane, often organize the caving spacing of wells 20 ~ 40m, often organize caving boring and have four caving borings, top cuts off hole always, a lumpiness cuts off hole and cut-out hole, two terminations to be respectively one, the diameter of each caving boring is not less than 75mm, old top cuts off hole and lumpiness cut-out hole horizontal corner is 70 ~ 90 °, termination cuts off hole horizontal corner 20 ~ 30 °, the sealed borehole length of caving boring is greater than 3 times of span length in the projection of horizontal plane, and sealed borehole length is greater than 10m;
(7) after total rock working face extraction, arrange on one to top board gas pumping drill site at interval of 20m in gob side entry retaining, to top plate pressure relief cracked district mash gas pumping drilling in the interior construction 3 of drill site, bore diameter is not less than 91mm, 50 ~ 65 °, inclination angle, aperture sealed borehole length is greater than the height of regular caving zone in mining rock stratum top board normal direction, and normal direction hole sealing depth is not less than 5 times of mining heights, extraction is covered high gas layer with gas pressure relief; Arrange to bottom gas pumping drill site at interval of 10m in gob side entry retaining, to base plate release cracked district mash gas pumping drilling under the interior construction 3 of drill site, bore diameter is not less than 91mm ,-50 ~-80 °, inclination angle, aperture sealed borehole length is not less than 15m, and extraction underlies high gas layer with gas pressure relief; In gob side entry retaining, arrange a goaf gas extraction drill site at interval of 20m, mash gas pumping drilling in construction 3 goafs in drill site, bore diameter is not less than 40mm, the gas in extraction goaf;
(8) ensure the construction of first advance drill site and boring according to the progress of back production, ensure gas pumping in gob side entry retaining according to progress simultaneously.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. adopt the high gas layer group release mining method altogether of total rock release work plane gob side entry retaining based on head for one kind, adopting pressure released seam by head causes coal rock layer to move to produce top plate pressure relief cracked district and base plate release cracked district, and in gob side entry retaining, cloth is set up to top plate pressure relief cracked district mash gas pumping drilling and carries out extraction to base plate release cracked district mash gas pumping drilling to desorb free gas down respectively; It is characterized in that: head adopt pressure released seam cannot choose time, adopt total rock release work plane by head cause coal rock layer to move and destroy, on cover high gas layer and the high gas layer that underlies unloads compression swelling, enclose rock mass fracture growth, gas permeation rate increases and desorb migration, forms top plate pressure relief cracked district and base plate release cracked district.
2. the high gas layer group release mining method altogether adopting total rock release work plane gob side entry retaining based on head according to claim 1, it is characterized in that: adopt total rock release work plane by head and cause coal rock layer to move and destroy, concrete grammar is: at advanced total rock work plane excavation drill site, and arrange in drill site and meet to working face open-off cut crown drill hole and working face open-off cut crown drill hole dorsad, be out of shape to control gob side entry retaining; According to the lithologic character above covering high gas layer, caving boring is set at advanced total rock work plane, Deephole pre-splitting blasting is implemented to ensure that top board is fully caving and fills goaf to caving boring; Simultaneously construct filled wall realize gob side entry retaining in the sky side of adopting of total rock work plane.
3. the high gas layer group release mining method altogether adopting total rock release work plane gob side entry retaining based on head according to claim 1, it is characterized in that: in described high gas layer group, the vertical distance of arbitrary neighborhood coal rock layer is 120 ~ 150m; When selecting head to adopt total rock release work plane, need to take into full account that surrounding rock structure, top board are across emitting and base plate release feature, and it is 30 ~ 90m that head adopts the vertical distance that total rock release work plane distance above covers high gas layer, the underlie vertical distance of high gas layer of distance is 20 ~ 60m.
4. the high gas layer group release mining method altogether adopting total rock release work plane gob side entry retaining based on head according to claim 1, it is characterized in that: when selecting head to adopt total rock release work plane, require: the formation hardness Protodyakonov coefficient that head adopts total rock release work plane is f≤7, work plane arrangement length is 150 ~ 250m, propelling length is 1000 ~ 2500m, mining is highly 1.3 ~ 3.5m, work plane inclination angle≤20 °.
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| CN201510061277.XA CN104712358A (en) | 2015-02-05 | 2015-02-05 | Coal seam group with high gas content pressure relief and co-mining method based on gob-side entry retaining of working face of first mining total rock pressure relief |
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| CN105840164A (en) * | 2016-03-18 | 2016-08-10 | 河南理工大学 | Regional pressure release coal bed gas mining method |
| CN106837408A (en) * | 2017-03-20 | 2017-06-13 | 中国矿业大学 | A kind of coal seam stope advantage gas migration passage staged construction method |
| CN106948859A (en) * | 2017-03-20 | 2017-07-14 | 中国矿业大学 | A kind of networking advantage gas migration passage is built and gas water conservancy diversion pumping method |
| CN107035370A (en) * | 2017-05-05 | 2017-08-11 | 太原理工大学 | One kind cuts top pressure relief method for gob side entry retaining static crushing |
| CN107460790A (en) * | 2017-07-22 | 2017-12-12 | 中铁二院工程集团有限责任公司 | A kind of non-fragment orbit railway swelling rock chasm structuref and construction method |
| CN108204244A (en) * | 2016-12-20 | 2018-06-26 | 中国矿业大学(北京) | The spoil interval method of collecting coal by the means of filling |
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