CN101082283A - Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method - Google Patents
Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method Download PDFInfo
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Abstract
A method for extracting pressure-relief gas from a gob roof of a gob-side entry retaining Y-shaped ventilation goaf is characterized in that desorption free gas from a mining layer and a pressure-relief layer which are gathered to the upper part of the gob and in an annular fracture ring through fracture channels formed by overlying strata of the gob under the influence of mining is extracted from a pressure-relief zone of the gob roof of a gob-side entry retaining working face by a dip extraction gas drill hole arranged in the pressure-relief annular fracture ring, and the pressure-relief annular fracture ring is positioned in a separation zone above a gob roof caving zone of the gob-side entry retaining working face of the Y-shaped ventilation working face. The invention fundamentally solves the problem that the gas of the air flow of the upper corner and the return airway of the coal face exceeds the limit, realizes the extraction and utilization of high-concentration gas and improves the resource utilization rate; meanwhile, the high-gas coal seam non-pillar mining is realized, the recovery rate of mine resources is improved, and the high-efficiency and safe mining of the coal face is ensured.
Description
Technical field
The present invention relates to the method for Safety of Coal Mine Production, the pressure relief gas pumping mining method in more specifically say so a kind of high gas layer coal work face goaf and top board overlying strata coal seam.
Background technology
The Anhui Huainan Mining Area is located in the innerland, East China, is the important coal energy base of China.Explored coal seam is soft low-permeable high gas layer, and the gas reserves reach 5,928 hundred million m
3Rich coal resources in the mining area, the minable coal seam number of plies is many, and gas is rich in the coal seam, gas permeability of coal seam is poor; Along with to deep mining, the difficulty of gas control is increasing.According to statistics, the goaf gas outburst amount accounts for more than 60% of face gas outburst amount.Wind gas-removing amount when solving working face extraction, Huainan Mining Area research and implemented to move towards the high-order extraction technology of top board since 1998 greatly reduces coal-face gas and threaten, but strike high-bleeding roadway or long drilled holes engineering quantity is big, the cost height, the preliminary preparation amount is big; Move towards high-order extraction effective coverage and be subjected to top board overlying strata structure and key stratum position influence big, the regional change of extraction rationally is big, and layer position is difficult to control, and the effect that draws out methane is difficult to be guaranteed fully.Simultaneously, traditional U type draft type, owing to leak out and carry that the goaf high concentration gas is collected to face upper corner angle and by distinguished and admirable discharge in the goaf, no matter adopt high-order boring, pipe laying extraction, still utilize height to take out the lane, all can not fundamentally solve upper corner gas exceeding limit and methane accumulation problem, influence the safety and the High-efficient Production of coal-face.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point, provide a kind of engineering quantity little, can solve upper corner gas exceeding limit and methane accumulation problem, can solve return gas exceeding limit problem, realize goaf high concentration gas methane drainage and utilization project, the method for the gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining of the safety in production of assurance mine.
The technical scheme that technical solution problem of the present invention is adopted is:
The characteristics of gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining method of the present invention are in gob side entry retaining goaf top plate pressure relief district, be pooled to the free gas of desorb in top, goaf and the annular fissure circle for the crack passage that formed by mining influence from mined bed and the release layer overlying rock by the goaf, by tendency mash gas extraction boring the carrying out extraction that is arranged in the release annular fissure circle district, release annular fissure circle is positioned at the above absciss layer fissure zone of goaf top plate caving zone of Y type ventilation operation face return air gob side entry retaining in gob side entry retaining.
Design feature of the present invention also is:
Behind seam mining, the last lane goaf side of work plane is formed gob side entry retaining by supporting, as the coal-face return airway, with work plane machine lane and material lane as the air intake lane, and with work plane machine lane as main air intake lane, intake accounts for 2/3 to 3/4 of the total intake of work plane, with the material lane as auxiliary air intake lane, intake is 1/4 to 1/3 of the total intake of work plane, work plane return air is flowed out through border return airway or windstone gate by gob side entry retaining, sets up gob side entry retaining Y type face-airing system.
The mash gas extraction pipeline is set in material lane and gob side entry retaining, each is inclined to mash gas extraction boring and is communicated with the formation of mash gas extraction pipeline, constitute the described free gas of desorb that collects in top, goaf and the annular fissure circle and hole, and enter the gas pumping system by the mash gas extraction pipe by the tendency mash gas extraction.
The selection of parameter of tendency mash gas extraction drill holes is: the tendency mash gas extraction whole hole site of holing is 10-30m apart from the horizontal range of coal-face return airway, apart from 8-10 times of mining height, and is not less than 30m apart from the roof normal direction.
The inclination angle of tendency mash gas extraction boring is less than adopting the release angle, and comprising: for gently inclined seam, dip angle of hole is not more than 80 °, and for half-edge coal seam, dip angle of hole is not more than 75 °.
The engineering time of tendency mash gas extraction boring is after coal-face is adopted back 20m, bore diameter is not less than 90mm, and the boring of tendency mash gas extraction is provided with in groups, and every group of quantity is no less than two, angle 60-70 ° of work plane, spacing 20-25m between the extraction borehole group are partial in boring.
Under the orifice end of tendency mash gas extraction boring sleeve pipe is arranged, greater than the height of adopting regular caving zone, and extraction borehole normal direction hole sealing depth is not less than 5 times of mining heights to the sealed borehole length in aperture on working seam top board normal direction.
For topping exploitation work plane, directly pass topping by the tendency mash gas extraction boring of constructing in the gob side entry retaining, the inclination angle of extraction borehole is less than adopting the release angle.
After the coal extraction, to adopt the space the former coal rock layer that is in original closed state is divided into a large amount of coal and rock, these coal and rock are surrounded by a large amount of spaces of adopting, and mining induced fissure becomes the passage in each coal petrography block of contact and work plane space.Coal desorb gas is lost in the goaf and upper and lower contiguous coal seam gas pressure relief flows to the goaf by mining induced fissure, and assembles in goaf and top board crack district thereof, forms the high concentration gas storehouse.The present invention is owing to the equal air intake in the upper and lower lane of work plane, and face upper corner angle is in the inlet side, has solved face upper corner angle gas exceeding limit problem; Work plane reality is ventilated low than the U type by air quantity, work plane upper/lower terminal pressure reduction is little, and work plane goaf inleakage is little, and the goaf gas amount that carries that leaks out is little; Gob side entry retaining forms closed area preferably by the density supporting, is easy in formation high concentration gas storehouse, work plane goaf.Because gas density is little, goaf gas accumulates in top, work plane goaf and overlying rock release crack district thereof.
Adopt the space and have two kinds of spaces that characteristics differ greatly, promptly adopt space and original space.It is much bigger to adopt original air gap characteristics size of air space ratio and permeability.A large amount of mining induced fissures and original space have constituted extremely complicated Gas Flow channel network, and mining induced fissure is the central core of circulation of Gas Flow.Overlying rock behind the seam mining forms two class cracks, and a class is the absciss layer crack, and another kind of is vertical disrumpent feelings crack.Wherein, the distribution in absciss layer crack presents two phase characteristics: the phase I, along with the advance of the face, the absciss layer crack constantly increased before the work plane first weighting, and grow most in absciss layer crack, middle part, goaf; Second stage is that work plane was adopted after the 100m, and absciss layer crack, middle part, goaf is tending towards compacting, and the absciss layer crack descends, and the both sides, goaf particularly stay side absciss layer crack, lane still can keep in top.In top board arbitrary height level, when second stage, the absciss layer crack that is positioned at the middle part, goaf is compacted substantially, and moves towards to exist on the direction absciss layer cranny development district that is communicated with on top, goaf.The existence in this absciss layer cranny development district, the high concentration gas that accumulates for the goaf and on cover the release coal rock layer gas pressure relief flow flow channel and space be provided, be goaf high concentration gas rich region.The present invention utilizes this to stay the mining induced fissure " banded crack district " of the gathering gas of lane formation to carry out goaf high concentration gas extraction just, is to solve work plane to stay lane return gas exceeding limit problem and the effective pumping method of mine high concentration gas methane drainage and utilization project problem.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention forms the high concentration gas source by gob-side entry retaining Y-type ventilation in the goaf, tendency mash gas extraction drill holes is at the mining induced fissure " banded crack district " of the gathering gas of gob side entry retaining formation, under the effect of gas pumping pump negative pressure, a large amount of overlying strata gas pressure relief and goaf high concentration gas are drawn out of, fundamentally solve upper corner gas exceeding limit and methane accumulation problem, solve return gas exceeding limit problem effectively, realize goaf high concentration gas methane drainage and utilization project, guaranteed the safety in production of mine.Method of the present invention, but the gas density of extraction reaches 40-90%.
2, mash gas extraction boring of the present invention is the boring of tendency mash gas extraction, boring runs through mining overburden caving zone, fissure zone successively to crooked subsiding belt, the solution top board moves towards mash gas extraction drill holes layer position and need accurately determine and the short problem of effective extraction length by coal measure strata overlying strata structure influence, and the effect that draws out methane is guaranteed.Tendency mash gas extraction hole pumping and mining gas than top board move towards high-order hole or height to take out lane extraction engineering quantity little.
3, gob-side entry retaining Y-type ventilation gas pumping method of the present invention is realized no coal pillar mining, does not have the stress of coal column influence area to concentrate, and eliminates protected projecting coal bed area of stress concentration coal and gas outburst danger and threatens.The closely protected projecting coal bed gas pressure relief boring of preferred arrangement in staying the lane return airway, the lane is taken out at alternative height, the end, and engineering quantity reduces greatly.
4, the present invention is by the gob-side entry retaining Y-type ventilation gas pumping method, the heat that electromechanical equipment and machinery etc. produce, bring gob side entry into by air intake and enter into special-purpose return airway, heat in the goaf directly enters special-purpose return airway by gob side entry, the staff all is positioned at air intake, and operating environment significantly improves.
5, the inventive method technology is simple, has tangible technical advantage and popularizing application prospect.
The drawing explanation
Fig. 1 is the method mash gas extraction schematic diagram of gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining of the present invention.
Fig. 2 is a gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining drill holes schematic diagram of the present invention.
Below by the specific embodiment, the invention will be further described in conjunction with the accompanying drawings:
The specific embodiment
In gob side entry retaining goaf top plate pressure relief district, be pooled to the free gas of desorb in top, goaf and the annular fissure circle for the crack passage that formed by mining influence by the goaf overlying rock from mined bed and release layer, by tendency mash gas extraction boring the carrying out extraction that is arranged in the release annular fissure circle, release annular fissure circle is positioned at the above absciss layer fissure zone of goaf top plate caving zone that Y type ventilation operation face return air stays the lane in gob side entry retaining.
In order to guarantee the gas pumping effect, the sequence of construction of mash gas pumping drilling, drill holes position and sealing also are key points, comprise in concrete the enforcement:
At first, tendency mash gas extraction boring goaf side hysteresis one-period after the back production of work plane coal seam is pressed step pitch, and about 20-30m begins construction, guarantees that the integrality of tendency mash gas extraction boring is not destroyed because of the inbreak of top board periodic weighting overlying strata.
Secondly, the inclination angle of tendency mash gas extraction boring is less than adopting the release angle, and comprising: for gently inclined seam, dip angle of hole is not more than 80 °, and for half-edge coal seam, dip angle of hole is not more than 75 °.
The selection of parameter of tendency mash gas extraction drill holes is: the tendency mash gas extraction is holed whole hole site apart from return airway horizontal range 10-30m, apart from the roof normal direction apart from 8-10 times of mining height and be not less than 30m.
The engineering time of extraction borehole, bore diameter was not less than 90mm after coal-face is adopted back 20m, and every group of extraction borehole quantity is no less than 2, and angle 60-70 ° of work plane, spacing 20-25m between the extraction borehole group are partial in boring.
Under the tendency extraction borehole orifice end sleeve pipe is arranged, greater than the height of adopting regular caving zone, and the extraction borehole hole sealing depth is not less than 5 times of mining heights to the sealed borehole length in aperture on working seam top board normal direction on the roof normal direction.
For topping exploitation work plane, directly pass topping by the mash gas extraction boring of constructing in the gob side entry retaining, the inclination angle of extraction borehole is less than adopting the release angle.
In concrete the enforcement, as shown in Figure 1 and Figure 2, behind seam mining, the last lane goaf side of work plane 4 is formed gob side entry retaining 7 by supporting 3, as the coal-face return airway, with work plane machine lane 1 and material lane 2 as the air intake lane, and with work plane machine lane 1 as main air intake lane, intake accounts for 2/3 to 3/4 of the total intake of work plane, with material lane 2 as auxiliary air intake lane, intake is 1/4 to 1/3 of the total intake of work plane, and work plane return air is flowed out through border return airway 8 or windstone gate by gob side entry retaining 7, sets up gob side entry retaining Y type face-airing system.
Shown in Figure 2, in material lane 2 and gob side entry retaining 7, mash gas extraction pipeline 5 is set, each is inclined to mash gas extraction boring 6 and is communicated with 5 formation of mash gas extraction pipeline, constitute the described free gas of desorb that collects in top, goaf and the annular fissure circle and hole 6, and enter the gas pumping system by mash gas extraction pipe 5 by the tendency mash gas extraction.
After the coal extraction, adopt the space the former coal rock layer that is in original closed state is divided into a large amount of coal and rock, these coal and rock are surrounded by a large amount of spaces of adopting, and mining induced fissure becomes the passage in each coal petrography block of contact and work plane space.Owing to stay the supporting role in lane, move towards to exist on the direction absciss layer cranny development district that is communicated with on top, goaf, the high concentration gas that accumulates for the goaf and on cover the release coal rock layer gas pressure relief flow flow channel and space be provided.Because coal-face generally has certain inclination angle and use ascensional ventilation, gas will rise floatingly when gas coexists with air, and the roof delamination cranny development district of lane formation is stayed on work plane top, is goaf high concentration gas rich region.Present embodiment utilizes this to stay the mining induced fissure " banded crack district " of the gathering gas of lane formation to carry out goaf high concentration gas extraction, efficiently solves the problem that work plane stays lane return gas exceeding limit problem and mine high concentration gas methane drainage and utilization project.
The boring of tendency mash gas extraction runs through mining overburden caving zone, fissure zone successively to crooked subsiding belt, if have unimpeded Gas Flow passage at the erecting dense individual props band, then the mash gas extraction flow is big, concentration is low, is unfavorable for goaf the leak out control and the gas utilization of extraction.Tendency mash gas extraction drilling orifice end requires setting of casing, material is a high-strength seamless steel pipe, the sealed borehole length in aperture should be greater than the height of adopting regular caving zone on normal direction, and principles and requirements tendency mash gas extraction boring method is not less than 5 times of mining heights to hole sealing depth, and the sealing of hole section requires closely knit air tight.Realize that the boring of tendency mash gas extraction has Gas Flow passage preferably in the crack section, mash gas extraction concentration height, scale are big.
For in topping exploitation work plane closely, by staying the mash gas extraction boring of constructing in the return airway of lane can directly pass topping, carry out the protected seam pressure relief gas pumping mining.Protected seam pressure relief gas pumping borehole should be arranged in the topping exploitation release influence basin.
Claims (8)
1, the method of gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining, it is characterized in that in gob side entry retaining goaf top plate pressure relief district, be pooled to the free gas of desorb in top, goaf and the annular fissure circle for the crack passage that formed by mining influence from mined bed and the release layer overlying rock by goaf (9), carry out extraction by the tendency mash gas extraction boring (6) that is arranged in the release annular fissure circle district in gob side entry retaining, release annular fissure circle is positioned at the above absciss layer fissure zone of goaf top plate caving zone of Y type ventilation operation face return air gob side entry retaining.
2, the method of gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining according to claim 1, it is characterized in that behind seam mining, the last lane goaf side of work plane (4) is formed gob side entry retaining (7) by supporting (3), as the coal-face return airway, with work plane machine lane (1) and material lane (2) as the air intake lane, and with work plane machine lane (1) as main air intake lane, intake accounts for 2/3 to 3/4 of the total intake of work plane, with material lane (2) as auxiliary air intake lane, intake is 1/4 to 1/3 of the total intake of work plane, work plane return air is flowed out through border return airway (8) or windstone gate by gob side entry retaining (7), sets up gob side entry retaining Y type face-airing system.
3, the method for gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining according to claim 2, it is characterized in that in material lane (2) and gob side entry retaining (7), mash gas extraction pipeline (5) being set, each is inclined to mash gas extraction boring (6) and is communicated with mash gas extraction pipeline (5) formation, constitute the described free gas of desorb that collects in top, goaf and the annular fissure circle and hole (6), and enter the gas pumping system by mash gas extraction pipe (5) by the tendency mash gas extraction.
4, the method for gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining according to claim 1, it is characterized in that the selection of parameter that described tendency mash gas extraction boring (6) is arranged is: the tendency mash gas extraction whole hole site of holing is 10-30m apart from the horizontal range of coal-face return airway, apart from 8-10 times of mining height, and be not less than 30m apart from the roof normal direction.
5, the method for gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining according to claim 1, the inclination angle that it is characterized in that described tendency mash gas extraction boring is less than adopting the release angle, comprise: for gently inclined seam, dip angle of hole is not more than 80 °, for half-edge coal seam, dip angle of hole is not more than 75 °.
6, the method for gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining according to claim 1, the engineering time that it is characterized in that described tendency mash gas extraction boring is after coal-face is adopted back 20m, bore diameter is not less than 90mm, described tendency mash gas extraction boring (6) is provided with in groups, every group of quantity is no less than two, angle 60-70 ° of work plane, spacing 20-25m between the extraction borehole group are partial in boring.
7, the method for gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining according to claim 1, it is characterized in that under the orifice end of described tendency mash gas extraction boring (6) sleeve pipe being arranged, greater than the height of adopting regular caving zone, and extraction borehole normal direction hole sealing depth is not less than 5 times of mining heights to the sealed borehole length in aperture on working seam top board normal direction.
8, the method for gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining according to claim 1; it is characterized in that for topping exploitation work plane; directly pass topping by the tendency mash gas extraction boring of constructing in the gob side entry retaining, the inclination angle of extraction borehole is less than adopting the release angle.
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| CNB2007100248596A CN100462523C (en) | 2007-06-29 | 2007-06-29 | Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method |
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| CNB2007100248596A CN100462523C (en) | 2007-06-29 | 2007-06-29 | Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method |
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| CN101614134B (en) * | 2009-07-15 | 2011-07-06 | 中国矿业大学 | Drilling-explosion-pumping triadic pressure-relief outburst-prevention method |
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