CN109162755A - A kind of coal uncovering method that electric pulse is combined with grouting and reinforcing - Google Patents
A kind of coal uncovering method that electric pulse is combined with grouting and reinforcing Download PDFInfo
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- CN109162755A CN109162755A CN201811054978.0A CN201811054978A CN109162755A CN 109162755 A CN109162755 A CN 109162755A CN 201811054978 A CN201811054978 A CN 201811054978A CN 109162755 A CN109162755 A CN 109162755A
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- electric pulse
- reinforcing
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- 239000003245 coal Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 238000005553 drilling Methods 0.000 claims abstract description 49
- 239000011440 grout Substances 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims abstract description 11
- 239000004568 cement Substances 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 11
- 238000007569 slipcasting Methods 0.000 claims description 6
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004080 punching Methods 0.000 abstract description 8
- 239000004575 stone Substances 0.000 abstract description 8
- 230000035939 shock Effects 0.000 abstract description 5
- 238000003795 desorption Methods 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Remote Sensing (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses the coal uncovering methods that a kind of electric pulse is combined with grouting and reinforcing, this method comprises: injecting water into drilling after discharge electrode and high-tension cable are sent into drilling towards coal seam construction drill by exposed coal work；By the water electric discharge of explosion-proof high-pressure electric pulse generator and discharge electrode into drilling, powerful shock wave is formed, so that coal body is generated crack, promotes desorption of mash gas, drilling is connected into methane gas extraction pipeline after multiple discharge；Then cement grout is injected into coal seam, is enhanced coal body mechanical strength, is reinforced coal seam, finally complete exposed coal.The present invention combines electric pulse fracturing with the method for grouting and reinforcing, porosity, the permeability for not only increasing coal seam promote the desorption of gas, effectively prevent the risk of coal and gas prominent, and coal seam is reinforced, be conducive to the safety for improving stone door punching coal.
Description
Technical field
The present invention relates to stone door punching coal technical fields, and in particular to one kind is suitable for easy high gas layer electric pulse outstanding
The coal uncovering method combined with grouting and reinforcing.
Background technique
One of most common disaster when coal and gas prominent is underground work, and mean intensity outstanding is remote when stone door punching coal
Much larger than the summation of other kinds tunnel intensity of outburst.The serious peace for having threatened underground labour of outstanding problem when stone door punching coal
Entirely, while restrict the efficient production of coal mine.Studies have shown that crossdrift protrusion is the mechanics in gas pressure, crustal stress and coal
The factors such as property it is comprehensive and effect as a result, wherein the mechanical strength of coal is that can it keep out key factor outstanding.
Existing projecting coal bed method for uncovering coal mainly carries out in terms of release is anti-reflection and coal seam reinforces the two, and coal seam is unloaded
Pressing anti-reflection mode mainly has the measures such as hydraulic flushing in hole, hydraulic fracturing and hydraulic slotted liner technique, and coal seam, which reinforces aspect, mainly metallic framework
With the measures such as grouting and reinforcing.These measures achieve some effects in stone door punching coal protrusion-dispelling, but there is also difficulty of construction is big,
The problems such as low efficiency, the serious manufacturing schedule for restricting coal mine.Therefore, there is an urgent need to provide it is a kind of be simple and efficient, it is safe and efficient
Coal uncovering method.
Summary of the invention
The object of the present invention is to provide a kind of stone door punching coal sides that safe and efficient electric pulse is combined with grouting and reinforcing
Method.
To achieve the above object, The technical solution adopted by the invention is as follows: what a kind of electric pulse was combined with grouting and reinforcing
Coal uncovering method, comprising the following steps:
A. it before exposed coal working face is less than 7m apart from coal seam normal distance, is constructed using conventional bore mode to coal seam
Drilling；
B. after the completion of drilling construction, respectively by positive high voltage cable and negative high voltage cable joint-box in cable protection at exposed coal working face
In pipe, and discharge electrode and explosion-proof high-pressure electric pulse generator are passed through into positive high voltage cable and negative high voltage cable connection respectively
Come, discharge electrode is sent to prebored hole bottom using cable protecting tube, and high-pressure rubber pipe is sent in drilling, high-pressure rubber pipe dew
The one end to drill out is connected with two-way, is sequentially connected grout injection control valve, grouting pump and slurry tank all the way, and another way is sequentially connected note
Taps, water pump and water tank；Drilling is sealed by hole packer, and clogs cable protecting tube with plug；
C. it after the completion of sealing, opens and fills the water switch, open water pump, the water filling into drilling is until water fills drilling, closing note
Taps；
D. it opens explosion-proof high-pressure electric pulse generator and is discharged in water by discharge electrode, after reignition 10-300 times
Stop electric discharge；Discharge electrode is retreated into 3-10m, reignition step outward using cable protecting tube, until discharge electrode moves back completely
It drills out；
E. the water in drilling is discharged by water pump and high-pressure rubber pipe, is sealed again after taking out discharge electrode and cable protecting tube
High-pressure rubber pipe is connect by hole with underground gas extraction pipe, carries out gas drainage；
F. after the completion of gas drainage, grout injection control valve is opened, using grouting pump by prepared cement grout injection hole
It is interior, it is injected into slurries in the crack of coal body and reinforces coal body, then conventionally tunneled, entered up through coal seam
Top plate 2m completes exposed coal work.
Preferably, the frequency of the explosion-proof high-pressure electric pulse generator is 5-10Hz, pulse number 200-800, electricity
Press range 0-600kV.
Preferably, in step f, the ratio of mud of the cement grout is 1:1.5.
Preferably, in step f, the grouting pressure is 0.5-1.5MPa, flow 10-30L/min, slip casting time 1-
5h。
Preferably, in step c, water injection pressure 0.3-0.9MPa.It is furthermore preferred that water injection pressure is 0.6MPa.
Preferably, in step d, discharge electrode is shunk back 6m using cable protecting tube.
Preferably, the material of the cable protecting tube is steel pipe.
The present invention is discharged in water by high electric field pulse generates powerful shock wave in coal body, splits coal body generation
Gap, while promoting the desorption of gas.Cement mortar is injected to coal seam after mash gas extraction, coal body is reinforced, is conducive to exposed coal
Operation.The present invention combines electric pulse fracturing with grouting and reinforcing, not only increases the porosity and permeability in coal seam, promotes
The desorption of gas, the gas pressure being greatly reduced in coal seam, and also the crack formed is conducive to expansion of the slurries in coal body
It dissipates, is improved coal mass strength, to improve the safety of stone door punching coal, there is extensive practical valence in the art
Value.
Detailed description of the invention
Fig. 1 is the stone door punching coal schematic diagram that electric pulse of the invention is combined with grouting and reinforcing.
Fig. 2 is explosion-proof high-pressure electric pulse generator, grouting pump station and water flooding pump station connection schematic diagram.
Fig. 3 is A-A exposed coal working face drilling arrangement schematic diagram in Fig. 1.
In figure: 1- explosion-proof high-pressure electric pulse generator, 2- plug, 3- cable protecting tube, 4- discharge electrode, 5- positive high voltage electricity
Cable, 6- negative high voltage cable, 7- high-pressure rubber pipe, 8- hole packer, 9- grout injection control valve, 10- grouting pump, 11- slurry tank, 12- water filling
Control valve, 13- water pump, 14- water tank, the coal seam 15-, 16- drilling, 17- exposed coal working face.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
As depicted in figs. 1 and 2, the coal uncovering method that electric pulse of the invention is combined with grouting and reinforcing, including it is following
Step:
A. before exposed coal working face 17 is less than 7m apart from 15 normal distance of coal seam, using conventional bore mode to coal seam
15 construction diameters are the drilling 16 of 10cm, and drill rectangular array distribution as shown in Figure 3；
B. after the completion of 16 construction of drilling, 6 sets of positive high voltage cable 5 and negative high voltage cable are existed respectively at exposed coal working face 17
Diameter is in the cable protecting tube 3 of 3cm, and discharge electrode 4 and explosion-proof high-pressure electric pulse generator 1 are passed through positive high voltage cable respectively
5 and negative high voltage cable 6 connect, discharge electrode 4 is sent to foot of hole using cable protecting tube 3, and be 2cm's by diameter
High-pressure rubber pipe 7 is sent in drilling 16, and one end that high-pressure rubber pipe 7 exposes drilling 16 is connected with two-way, is sequentially connected slip casting all the way
Control valve 9, grouting pump 10 and slurry tank 11, another way are sequentially connected water filling switch 12, water pump 13 and water tank 14；Pass through hole packer
8 pairs of drillings 16 are sealed, and clog cable protecting tube 3 with plug 2；
C. after the completion of sealing, water filling switch 12 is opened, water pump 13 is opened, by the water injection hole 16 in water tank 14, pressed
Power is 0.6MPa, until closing water filling switch 12 after water fills drilling 16；
D. it opens explosion-proof high-pressure electric pulse generator 1 and is discharged in water by discharge electrode 4, form powerful shock wave
It acts on coal seam 15, coal seam 15 occurs broken, stop electric discharge after reignition 260 times；It will be discharged using cable protecting tube 3 electric
Pole 4 retreats 6m, reignition step outward, until discharge electrode 4 exits drilling completely；
E. the water in drilling 16 is discharged by water pump 13 and high-pressure rubber pipe 7, after taking out discharge electrode 4 and cable protecting tube 3
High-pressure rubber pipe 7 is connect by sealing of hole again with underground gas extraction pipe, carries out gas drainage；
F. after the completion of gas drainage, grout injection control valve 9 is opened, using grouting pump 10 by cement prepared in slurry tank 11
In slurries (ratio of mud 1:1.5, grouting pressure 0.9MPa, flow 15L/min, slip casting time 3h) injection hole 16, make
Slurries are injected into the coal body in the crack of coal body to reinforce around drilling 16, are then conventionally tunneled, until wearing
It crosses coal seam and enters top plate 2m, complete exposed coal work.
Embodiment 2
As depicted in figs. 1 and 2, the coal uncovering method that electric pulse of the invention is combined with grouting and reinforcing, including it is following
Step:
A. before exposed coal working face 17 is less than 7m apart from 15 normal distance of coal seam, using conventional bore mode to coal seam
15 construction diameters are the drilling 16 of 10cm, and drill rectangular array distribution as shown in Figure 3；
B. after the completion of 16 construction of drilling, 6 sets of positive high voltage cable 5 and negative high voltage cable are existed respectively at exposed coal working face 17
Diameter is in the cable protecting tube 3 of 3cm, and discharge electrode 4 and explosion-proof high-pressure electric pulse generator 1 are passed through positive high voltage cable respectively
5 and negative high voltage cable 6 connect, discharge electrode 4 is sent to prebored hole bottom using cable protecting tube 3, and be 2cm by diameter
High-pressure rubber pipe 7 be sent to drilling 16 in, high-pressure rubber pipe 7 expose drilling 16 one end be connected with two-way, be sequentially connected note all the way
Control valve 9, grouting pump 10 and slurry tank 11 are starched, another way is sequentially connected water filling switch 12, water pump 13 and water tank 14；Pass through sealing of hole
8 pairs of device drillings 16 are sealed, and clog cable protecting tube 3 with plug 2；
C. after the completion of sealing, water filling switch 12 is opened, water pump 13 is opened, by the water injection hole 16 in water tank 14, pressed
Power is 0.3MPa, until closing water filling switch 12 after water fills drilling 16；
D. it opens explosion-proof high-pressure electric pulse generator 1 and is discharged in water by discharge electrode 4, form powerful shock wave
It acts on coal seam 15, coal seam 15 occurs broken, stop electric discharge after reignition 10 times；It will be discharged using cable protecting tube 3 electric
Pole 4 retreats 3m, reignition step outward, until discharge electrode 4 exits drilling completely；
E. the water in drilling 16 is discharged by water pump 13 and high-pressure rubber pipe 7, after taking out discharge electrode 4 and cable protecting tube 3
High-pressure rubber pipe 7 is connect by sealing of hole again with underground gas extraction pipe, carries out gas drainage；
F. after the completion of gas drainage, grout injection control valve 9 is opened, using grouting pump 10 by cement prepared in slurry tank 11
In slurries (ratio of mud 1:1.5, grouting pressure 0.5MPa, flow 10L/min, slip casting time 5h) injection hole 16, make
Slurries are injected into the coal body in the crack of coal body to reinforce around drilling 16, are then conventionally tunneled, until wearing
It crosses coal seam and enters top plate 2m, complete exposed coal work.
Embodiment 3
As depicted in figs. 1 and 2, the coal uncovering method that electric pulse of the invention is combined with grouting and reinforcing, including it is following
Step:
A. before exposed coal working face 17 is less than 7m apart from 15 normal distance of coal seam, using conventional bore mode to coal seam
15 construction diameters are the drilling 16 of 10cm, and drill rectangular array distribution as shown in Figure 3；
B. after the completion of 16 construction of drilling, 6 sets of positive high voltage cable 5 and negative high voltage cable are existed respectively at exposed coal working face 17
Diameter is in the cable protecting tube 3 of 3cm, and discharge electrode 4 and explosion-proof high-pressure electric pulse generator 1 are passed through positive high voltage cable respectively
5 and negative high voltage cable 6 connect, discharge electrode 4 is sent to prebored hole bottom using cable protecting tube 3, and be 2cm by diameter
High-pressure rubber pipe 7 be sent to drilling 16 in, high-pressure rubber pipe 7 expose drilling 16 one end be connected with two-way, be sequentially connected note all the way
Control valve 9, grouting pump 10 and slurry tank 11 are starched, another way is sequentially connected water filling switch 12, water pump 13 and water tank 14；Pass through sealing of hole
8 pairs of device drillings 16 are sealed, and clog cable protecting tube 3 with plug 2；
C. after the completion of sealing, water filling switch 12 is opened, water pump 13 is opened, by the water injection hole 16 in water tank 14, pressed
Power is 0.9MPa, until closing water filling switch 12 after water fills drilling 16；
D. it opens explosion-proof high-pressure electric pulse generator 1 and is discharged in water by discharge electrode 4, form powerful shock wave
It acts on coal seam 15, coal seam 15 occurs broken, stop electric discharge after reignition 300 times；It will be discharged using cable protecting tube 3 electric
Pole 4 retreats 10m, reignition step outward, until discharge electrode 4 exits drilling completely；
E. the water in drilling 16 is discharged by water pump 13 and high-pressure rubber pipe 7, after taking out discharge electrode 4 and cable protecting tube 3
High-pressure rubber pipe 7 is connect by sealing of hole again with underground gas extraction pipe, carries out gas drainage；
F. after the completion of gas drainage, grout injection control valve 9 is opened, using grouting pump 10 by cement prepared in slurry tank 11
In slurries (ratio of mud 1:1.5, grouting pressure 1.5MPa, flow 30L/min, slip casting time 1h) injection hole 16, make
Slurries are injected into the coal body in the crack of coal body to reinforce around drilling 16, are then conventionally tunneled, until wearing
It crosses coal seam and enters top plate 2m, complete exposed coal work.
In above embodiments, the frequency of the explosion-proof high-pressure electric pulse generator 1 is 5-10Hz, pulse number 200-
800, voltage range 0-600kV.
The material of the cable protecting tube 3 is steel pipe.
Claims (8)
1. the coal uncovering method that a kind of electric pulse is combined with grouting and reinforcing, which comprises the following steps:
A. before exposed coal working face (17) is less than 7m apart from coal seam (15) normal distance, using conventional bore mode to coal seam
(15) construction drill (16)；
B. after the completion of drilling (16) construction, respectively by positive high voltage cable (5) and negative high voltage cable (6) at exposed coal working face (17)
It covers inside cable protecting tube (3), and discharge electrode (4) and explosion-proof high-pressure electric pulse generator (1) is passed through into positive high voltage electricity respectively
Cable (5) and negative high voltage cable (6) connect, and discharge electrode (4) are sent to foot of hole using cable protecting tube (3), and will
High-pressure rubber pipe (7) is sent in drilling (16), and one end that high-pressure rubber pipe (7) exposes drilling (16) is connected with two-way, all the way successively
Grout injection control valve (9), grouting pump (10) and slurry tank (11) are connected, another way is sequentially connected water filling switch (12), water pump (13)
With water tank (14)；Drilling (16) is sealed by hole packer (8), and clogs cable protecting tube (3) with plug (2)；
C. after the completion of sealing, water filling switch (12) is opened, is opened water pump (13), to water filling in drilling (16) until water fills drilling
(16), water filling switch (12) is closed；
D. it opens explosion-proof high-pressure electric pulse generator (1) and is discharged in water by discharge electrode (4), reignition 10-300 times
Stop electric discharge afterwards；Discharge electrode (4) is retreated into 3-10m, reignition step, until electric discharge electricity outward using cable protecting tube (3)
Drilling (16) are exited in pole (4) completely；
E. discharge electrode (4) and cable protecting tube are taken out into the water discharge in drilling (16) by water pump (13) and high-pressure rubber pipe (7)
(3) sealing of hole again after, high-pressure rubber pipe (7) is connect with underground gas extraction pipe, carries out gas drainage；
F. it after the completion of gas drainage, opens grout injection control valve (9), prepared cement grout is injected using grouting pump (10) and is bored
In hole (16), so that slurries is injected into the coal body reinforced around drilling (16) in the crack of coal body, then conventionally carry out
Driving enters top plate 2m up through coal seam, completes exposed coal work.
2. the coal uncovering method that a kind of electric pulse according to claim 1 is combined with grouting and reinforcing, which is characterized in that
The frequency of the explosion-proof high-pressure electric pulse generator (1) is 5-10Hz, pulse number 200-800, voltage range 0-
600kV。
3. the coal uncovering method that a kind of electric pulse according to claim 1 or 2 is combined with grouting and reinforcing, feature exist
In in step f, the ratio of mud of the cement grout is 1:1.5.
4. the coal uncovering method that a kind of electric pulse according to claim 1 or 2 is combined with grouting and reinforcing, feature exist
In in step f, the grouting pressure is 0.5-1.5MPa, flow 10-30L/min, slip casting time 1-5h.
5. the coal uncovering method that a kind of electric pulse according to claim 1 or 2 is combined with grouting and reinforcing, feature exist
In, in step c, water injection pressure 0.3-0.9MPa.
6. the coal uncovering method that a kind of electric pulse according to claim 5 is combined with grouting and reinforcing, which is characterized in that
In step c, water injection pressure 0.6MPa.
7. the coal uncovering method that a kind of electric pulse according to claim 1 or 2 is combined with grouting and reinforcing, feature exist
In discharge electrode being shunk back 6m using cable protecting tube in step d.
8. the coal uncovering method that a kind of electric pulse according to claim 1 or 2 is combined with grouting and reinforcing, feature exist
In the material of the cable protecting tube (3) is steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811054978.0A CN109162755B (en) | 2018-09-11 | 2018-09-11 | Rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811054978.0A CN109162755B (en) | 2018-09-11 | 2018-09-11 | Rock cross-cut coal uncovering method combining electric pulse and grouting reinforcement |
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| CN109162755A true CN109162755A (en) | 2019-01-08 |
| CN109162755B CN109162755B (en) | 2020-07-28 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110159305A (en) * | 2019-04-12 | 2019-08-23 | 平顶山天安煤业股份有限公司 | A kind of compound top working face wall grouting parameter optimization method of large mining depth high working face |
| CN111520182A (en) * | 2020-04-27 | 2020-08-11 | 中国矿业大学 | Electric pulse fracturing and gas injection displacement synergistic regional gas extraction method |
| CN111520140A (en) * | 2020-04-27 | 2020-08-11 | 中国矿业大学 | Rock cross-cut coal uncovering method based on gas injection displacement enhanced electric pulse fracturing |
| CN112096382A (en) * | 2020-08-25 | 2020-12-18 | 中国矿业大学 | Advanced grouting reinforcement method for narrow coal pillars of gob-side roadway |
| CN112709572A (en) * | 2019-10-24 | 2021-04-27 | 西安闪光能源科技有限公司 | Rock cross-cut coal uncovering method based on controllable shock wave permeability increase |
| CN112814609A (en) * | 2021-01-05 | 2021-05-18 | 河南理工大学 | A sealed stopper device of recoverable formula for coal seam roof reinforcing operation |
| CN112855073A (en) * | 2021-02-04 | 2021-05-28 | 河南理工大学 | Device and method for solidifying coal bed by using microorganisms in cross-cut coal uncovering process |
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| CN112855073B (en) * | 2021-02-04 | 2022-09-20 | 河南理工大学 | Device and method for solidifying coal bed by using microorganisms in cross-cut coal uncovering process |
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