CN107035401A - A kind of abandoned mine fire damp administers new technology - Google Patents
A kind of abandoned mine fire damp administers new technology Download PDFInfo
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- CN107035401A CN107035401A CN201710383542.5A CN201710383542A CN107035401A CN 107035401 A CN107035401 A CN 107035401A CN 201710383542 A CN201710383542 A CN 201710383542A CN 107035401 A CN107035401 A CN 107035401A
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- abandoned mine
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000005516 engineering process Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000004575 stone Substances 0.000 claims abstract description 34
- 238000005065 mining Methods 0.000 claims abstract description 18
- 239000011449 brick Substances 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 9
- 241001347978 Major minor Species 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 239000002362 mulch Substances 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 8
- 239000011083 cement mortar Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000004567 concrete Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052655 plagioclase feldspar Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000000192 social effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 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
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
-
- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of abandoned mine fire damp administers new technology：The processing step is：1）Underground point tunnel is implemented to block before the closing of discarded colliery, and steel pipe hole is reserved on block wall top, makes inside and outside connection；2）Steel pipe hole is reserved on the laneway plugging wall of multiple points of underground respectively with fire damp pump drainage main pipe system to couple, and carries out gas exhaust；3）The drift dewatering of closure is connected with main drift dewatering, and water storing bin is built in down well placement lower, suction pump is installed and underground gushing water is pumped to ground by water pipe, the effect that the normal pump drainage of underground gushing water can be achieved after the closing of colliery is reached；4）Abandoned mine major-minor well head is closed, footrill, inclined shaft are to build work stone wall plus loess filling shape embedded steel tube by laying bricks or stones, and vertical blocks major-minor well head in reinforced concrete cover plate form, while embedded steel tube makes the inside and outside connection of well head；5）Mining is carried out to fire damp by ground gas mining equipment.The present invention can reach the purpose utilized to the abandoned mine fire damp comprehensive regulation.
Description
Technical field
Field is administered the invention belongs to mine gas, more particularly, to a kind of abandoned mine gas control novel technique.
Background technology
Abandon coal mine gas refer to because resourse-depleting or other do not meet safety in production require and policy reasons, by country
Relevant regulations program and in the mine closed, remain in remaining coal seam, country rock and the absorption of underground airtight space and free state
Methane resource.Abandoned mine gas is developed, and is before colliery will be closed, to take certain close measure, is utilized former gas
Evacuation system is in ground extraction gas utilization.Only there are some researchs, mesh in the country in theory in terms of abandoned mine Treatment process
Preceding no successful experience and project.Although some mining areas have carried out the utilization of surface drilling mining, truly discarded
Comprehensive Control of Mine Gas still belongs to blank using industrialization.As domestic coal industry structural reform and superseded production are workable
Carry out, the quantity for closing down colliery increases year by year.The gas loss of this abandoned mine, collapse landslide, spoil pollution, underground ponding
Harm etc. is disastrous also increasingly to be highlighted, if administered without science, ecological environment will be threatened seriously, while these are closed
The colliery stopped is rich in substantial amounts of gas resources, according to the relevent statistics, and in the whole nation, this discarded device in Gas resource reaches trillion cubes.
If this technology whole nation is promoted and industrialized development is formed, it is beneficial to promote Unconventional gas money during " 13 "
The exploitation in source, get rid of poverty while may advantageously facilitate China Coal Enterprises transition, increase new job, realize waste resource
Recycle, it is often more important that solve the safe and environment-friendly problem of abandoned mine, protect ecological environment, social effect is great.
The content of the invention
The purpose of the present invention is that the weak point existed for existing discarded coal mine gas control is being discarded there is provided one kind
Underground coal mine implements laneway plugging, reserving hole, gas exhaust pipe-line system connection transformation, pumping system transformation, passes through ground
Mining equipment carries out mining to fire damp, reaches the effect that abandoned mine Comprehensive Gas Control is utilized.
The processing step for realizing the technical scheme of the object of the invention is such：
1）Of a relatively high tunnel is overflowed to fire damp before discarded colliery closing, with main tunnel connector at implement to expect
Stone walling closure and preserved pipeline, open up mash gas and carry out water burst pump drainage：
A. underworkings is blocked：Before will being closed in discarded colliery, minery, goaf operation branch heading and main lane in underground
At road connector, inner side is first built by laying bricks or stones with work stone wall, about 0.8-1 meters of thickness, and middle with loess padding and compacting, thickness is 5 meters, then
It is outer then work stone wall is built by laying bricks or stones again, about 0.8-1 meters of thickness, pre-buried pipeline is wanted in whole enclosing wall building process, makes to connect inside and outside tunnel
It is logical, dismountable closing cap is done on the outside of this communicating pipe, in case to stretching into gas detector detection in enclosing tunnel.As detected
To for high methane service tunnel, then this pipeline is directly connected with fire damp total pipeline.It is same that the row of setting is needed on the downside of block wall
Water hole hole, enables water burst in tunnel to discharge.Couple after original gas exhaust ductwork modifications with the holding of ground evacuation system,
Realize abandoned mine gas underground mining；
B. underground gushing water pump drainage：Under normal circumstances, underground underground water is constantly to gush out to goaf, and colliery is normally produced
When, after underground gushing water pump drainage is also an emphasis in coal production routine work, but stopping production mine in colliery is closed, if underground
Water burst is discharged not in time, then water burst is accumulated, and will drown out mine goaf tunnel, and such fire damp then stores respectively without space effusion,
More can not methane drainage and utilization project.The present invention is after mine stops production closing, to redesign underground gushing water and administer evacuation system, make under mine
In the state of unmanned work, underground gushing water ground can be pumped on ground, retaining makes fire damp effusion accumulation institute
The space needed, it is to avoid mine ponding, while being achieved abandoned mine gas control.
The present invention is that when building block wall by laying bricks or stones in tunnel, a water seal overflow tank is made in block wall lower inside,
Water burst remittance product is arrived in this tank in tunnel, can be gone out when liquid level reach a certain height by water seal overflow outside block wall, simultaneously
The rather high concentration device in Gas of accumulation will not be flowed out by this rhone in block wall, the water burst gone out from water seal overflow channel with
The gutter connection in main tunnel, which converges, accumulates, then ore deposit down well placement lowest part sets a water storing bin, and this water storing bin is generally work stone, water
Cement mortar is built by laying bricks or stones, and retaining volume determines water storing bin volume size according to inflow rate of mine water size, and the water of main drift dewatering ditch, which converges, to be accumulated
To this water storing bin, on the ground by being accurately positioned, in the range of brill a bite pumped well to this water storing bin, on ground, well head passes through
Suction pump and connecting pipe are installed in pit shaft, water level in the depths of bottom about 2/3, water storing bin is extend into retaining and reaches to draw water and be pumped into
During open height, water pump is to start work of drawing water, and the water in water storing bin is pumped into ground recycles.So as to realize that colliery is closed behind hole
Still underground gushing water can be pumped to ground, have enough space release storage gas to preserve underground, reach to abandoned mine watt
The purpose that this underground comprehensive regulation is utilized.
2）The pipeline reserved on block wall is connected with fire damp evacuation duct respectively, fire damp mining pipeline is formed
System, recycles the fire damp evacuation system equipment on original ground to carry out pump drainage to the gas accumulated under abandoned mine：
1 solid reinforced concrete cover plate for being more than shaft section is poured into a mould in the well head of vertical, during pouring, in centre
Pre-buried two steel pipes, the open at one end stretched on the inside of pit shaft is connected with underground space.Pit shaft lateral ends mounting flange lid, spiral shell
Tether and connect closing.Inclined shaft and footrill should build 1 brick cup, stone or concrete walls by laying bricks or stones at plagioclase 20m within well head, thickness of wall body is not small
In 0.6 meter, it is necessary to solid and reliable, then cover in well head, then build brick, stone or concrete protection wall by laying bricks or stones.Dismantled after mine closing
This built-in pipe outer flange lid, stretches into gas detector or sampling equipment, you can gas density in analysis well, such as device in Gas can profits
With then this mouth of pipe is connected with ground gas mining pipeline, realizes that the gas that is stored to underground carries out mining profit after mine closing
With.
3）The drift dewatering of closure is connected with main drift dewatering, and water storing bin is built in down well placement lower, on ground
Upper brill drainage bore is reached at shaft sump position, installs suction pump and underground gushing water is pumped to ground by water pipe, reaches that colliery is sealed
The effect of the normal pump drainage of underground gushing water can be achieved after closing；
4）Treat after the completion of above work, with work stone, cement, sand etc. by laying bricks or stones external wall in closing built to footrill formula, inclined shaft major-minor well head,
Closed between interior external wall with loess, clay filled compacting, vertical is then blocked at well head with reinforced concrete cover plate
Well head, is stretched into mine, vertical is then in reinforced concrete earth mulch during whole closure in footrill formula slope mouth top embedded steel tube
Plate center embedded steel tube, makes the inside and outside connection of well, is connected, is realized to abandoned mine with the original gas exhaust system equipment pipeline in ground
Gas exhaust administers the effect utilized.
5）Mash gas side by side is connected with fire damp mining total pipeline by ground gas mining equipment, reached to discarding ore deposit
The purpose that the well fire damp comprehensive regulation is utilized.
The present invention has following effect：By to the closure of abandoned mine underworkings, fire damp pipeline modification, underground gushing water
Pump drainage is transformed, the Comprehensive Gas Control measure such as abandoned mine well head closing, reaches the aggregation of elimination abandoned mine fire damp, effusion
The disaster brought with underground ponding, while abandoned mine gas resources can be recycled, realize economic benefit, environmental benefit and
Good social benefit.
Brief description of the drawings
Fig. 1 is the fire damp pipe-line system in present invention process.
Fig. 2 is the underground gushing water drainage system in the present invention.
Fig. 3 is that abandoned mine pit mouth of the present invention closes schematic diagram.
Fig. 4 is that abandoned mine inclined shaft of the present invention is blocked, gas adopts discharge pipe schematic diagram.
As shown in the figure：1st, underground point tunnel one, 2, underground point tunnel two, 3, underground point tunnel three, 4, underground point tunnel envelope
Wall, 5, pre-buried pipeline, 6, pipe flange, 7, fire damp pump drainage total pipeline, 8, the main tunnel in underground, 9, underground point tunnel row
The mouth of a river, 10, the main drift dewatering ditch in underground, 11, underground water storing bin, 12, draining pump, 13, draining pit shaft, 14, abandoned mine main shaft
Mouthful, 15, well head closure cover plate, 16, reserved gas mining pipeline, 17, abandoned mine main slant, 18, built-in pipe in block wall
Road, 19, inner side closure work stone wall,
20th, loess or sandy soil filled section, 21, outside closure work stone wall, 22, gas exhaust ground total pipeline.
Embodiment
As shown in figure 1, a kind of abandoned mine fire damp administers new technology, before discarded colliery will be closed, in discarded ore deposit
Well underground minery, the cave mouthful inwardly at about 8 meters in goaf operation area Nei Fen tunnels 1,2,3, build block wall 4 by laying bricks or stones respectively.Specifically
Way is in point tunnel at 8 meters, first builds block wall by laying bricks or stones with work stone, cement mortar, about 0.8-1 meters of thickness, by laneway plugging, in
Between with loess padding and compacting, thickness is 5 meters, then then builds work stone, cement mortar block wall by laying bricks or stones again outside, about 0.8-1 meters of thickness,
Will be in protection wall away from thick pre-buried of pre-buried 1 DN100-DN200 at 0.2-0.3 rice at the top of cave in whole enclosing wall building process
Pipeline 5, makes point tunnel and the main airflow connection of tunnel 8 by the pre-buried pipeline 5 of this root, the envelope of pipe flange 6 is done on the outside of this built-in pipe
Close, open on the inside of point tunnel, dismantling pipe flange on the outside of this built-in pipe can be to stretching into gas detector detection in enclosing tunnel.Such as
Gas density reaches that then this pipeline can be directly connected by flange with fire damp pump drainage total pipeline 7, then be passed through using condition
The original gas exhaust equipment in ground carries out pump drainage utilization to underground and gas.
As shown in Figure 2：Discarded underground coal mine water burst evacuation system, discards before the closing of colliery, envelope is built by laying bricks or stones in underground point tunnel 1
During wall, underground point drift dewatering mouthful 9 is set on the downside of block wall, and this discharge outlet is overflow hydrolock, tight on the inside of point tunnel
By repairing the collecting-tank that a cement mortar is wiped one's face at block wall, size makes to gush out in point tunnel with determining according to point tunnel water yield
Water be pooled to collecting-tank, when ponding liquid level reaches overflow height, then from the overflow launder outflow point of point laneway plugging wall bottom
Tunnel, enables water burst in point tunnel to discharge, and will not be let out with the device in Gas in time-division tunnel from this overflow hydrolock discharge outlet 9
Go out.The water burst gone out from each point of tunnel overflow separately flows into the gutter 10 that the cement mortar set in main tunnel is wiped one's face, in ore deposit
Underground work face relative relief lower sets water storing bin 11, and the water storing bin is to dig out a footrill in underground physical features lowest part, with
Cement mortar is wiped one's face, and the size length and width of sump, depth are true by underworkings size, pumping system ability and water yield concrete condition
Fixed, general sump size is composed in series for two sump of long 20 meters wide 3 meters of 3 meters of depths, and a bite draining is played in sump upper base
Pit shaft 13, is got in the range of sump, sump is connected by draining pit shaft 13 with ground, and draining pump is installed in this draining pit shaft
12, the outlet of draining pump 12 is connected in the water treatment facilities of ground, the underground gushing water that will be accumulated by draining pump in shaft sump
Discharge, to ensure that there is enough space release storage gas underground, reaches what the underground comprehensive regulation of abandoned mine gas was utilized
Purpose.
As shown in Figure 3：In present invention process at abandoned mine main shaft mouthful 14, closing well head is carried out, reinforced concrete is set
Tu Jing blocks cover plate 15, and this cover plate upper surface is far from this reinforced concrete cover plate thickness of ground, rebar sizes used, concrete mark
Number, proportioning etc. press well head span size dimension, need professional structure designing unit carry out Specialty Design give, applied by design document
Work, need to be in the pre-buried 1-2 roots steel pipe 3 in the centre of cover plate 15 when manufacturing this reinforced concrete cover plate, and diameter of steel tube is DN300-
500mm, this built-in pipe one end is stretched into inside well head, and length need to be more than 15 meters, and inside bore side is open form, and the other end is in steel
Above reinforced concrete cover plate, pipe flange bolt is welded at ground 0.5-1 meters by blind flange and the flange connection closure mouth of pipe,
Dismantle this blind flange and sample apparatus, sampling analysis fire damp concentration, by this pipeline and ground if available are stretched into pipe
Gas exhaust system pipeline is connected, and the gas stored to underground carries out mining utilization, reaches abandoned mine Comprehensive Gas Control
Effect.
As shown in Figure 4：Abandoned mine master is inclined shaft in present invention process, then big away from well head when the well head of main slant 17 is blocked
In 25 meters of depths, sealing material stone walling 3 is first built by laying bricks or stones with work stone head, cement mortar, thickness is not less than 1 meter, then with loess or clay
Padding and compacting, is more than 20 meters in loess or the filling thickness of sandy soil filled section 20, is filled at inclined shaft cave mouthful, then build work stone cement by laying bricks or stones
Mortar sealing inner side closure work stone wall 19, thickness is not less than 1 meter, during whole closure, in the pre-buried 1-2 roots steel in cave mouthful top
Pipe 2, diameter of steel tube is DN300-500mm, and this pre-buried one end of pipeline 18 is stretched into inside well head 1, and length need to be more than 20 meters, and prop up
Frame is reinforced, and the mouth of pipe is open form, and the other end is in the outside of slope mouth closure work stone wall 19, apart from welding at 0.5-1 meter of block wall
Blind flange and the flange connection closure mouth of pipe are dismantled this blind flange and sample apparatus, sampling point are stretched into pipe by pipe flange bolt
Fire damp concentration is analysed, the original gas exhaust ground total pipeline 22 in this pipeline and ground is connected as if, underground is stored
The gas deposited carries out mining utilization, reaches the effect of abandoned mine gas control.
Claims (1)
1. a kind of abandoned mine fire damp administers new technology：It is characterized in that：The technology is realized by following steps：
1）Of a relatively high tunnel is overflowed to fire damp before discarded colliery closing, with main tunnel connector at implement work stone
Wall closure and preserved pipeline, open up mash gas and carry out water burst pump drainage；
2）The pipeline reserved on block wall is connected with fire damp evacuation duct respectively, fire damp mining pipeline system is formed
System, recycles the fire damp evacuation system equipment on original ground to carry out pump drainage to the gas accumulated under abandoned mine；
3）The drift dewatering of closure is connected with main drift dewatering, and water storing bin is built in down well placement lower, is bored on the ground
Drainage bore is reached at shaft sump position, installs suction pump and underground gushing water is pumped to ground by water pipe, is reached after the closing of colliery
The effect of the normal pump drainage of underground gushing water can be achieved；
4）Treat after the completion of above work, with work stone, cement, sand etc. by laying bricks or stones external wall in closing built to footrill formula, inclined shaft major-minor well head,
Closed between interior external wall with loess, clay filled compacting, vertical is then blocked at well head with reinforced concrete cover plate
Well head, is stretched into mine, vertical is then in reinforced concrete earth mulch during whole closure in footrill formula slope mouth top embedded steel tube
Plate center embedded steel tube, makes the inside and outside connection of well, is connected, is realized to abandoned mine with the original gas exhaust system equipment pipeline in ground
Gas exhaust administers the effect utilized；
5）Mash gas side by side is connected with fire damp mining total pipeline by ground gas mining equipment, reached to abandoned mine well
The purpose that lower Comprehensive Gas Control is utilized.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710383542.5A CN107035401B (en) | 2017-05-26 | 2017-05-26 | A kind of abandoned mine fire damp administers new technology |
| PCT/CN2018/082635 WO2018214659A1 (en) | 2017-05-26 | 2018-04-11 | Novel process for controlling downhole gas in abandoned mine |
| EP18805598.2A EP3633142B1 (en) | 2017-05-26 | 2018-04-11 | Novel process for controlling downhole gas in abandoned mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710383542.5A CN107035401B (en) | 2017-05-26 | 2017-05-26 | A kind of abandoned mine fire damp administers new technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107035401A true CN107035401A (en) | 2017-08-11 |
| CN107035401B CN107035401B (en) | 2018-04-10 |
Family
ID=59540530
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710383542.5A Active CN107035401B (en) | 2017-05-26 | 2017-05-26 | A kind of abandoned mine fire damp administers new technology |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3633142B1 (en) |
| CN (1) | CN107035401B (en) |
| WO (1) | WO2018214659A1 (en) |
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| WO2018214659A1 (en) * | 2017-05-26 | 2018-11-29 | 中节能宁夏新能源股份有限公司 | Novel process for controlling downhole gas in abandoned mine |
| CN110159226A (en) * | 2019-06-19 | 2019-08-23 | 贵州盘江精煤股份有限公司 | A kind of gas control provided pipe fast plugging device |
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| CN110905598B (en) * | 2019-12-05 | 2023-08-29 | 中煤地质集团有限公司 | Column type high-angle inclined roadway drilling grouting plugging equipment and method |
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| CN113944497B (en) * | 2021-10-14 | 2023-12-26 | 平安煤矿瓦斯治理国家工程研究中心有限责任公司 | Method for preventing and controlling gas leakage of waste mine shaft |
| CN115853583A (en) * | 2022-09-02 | 2023-03-28 | 中国矿业大学 | Method for reforming and utilizing abandoned mine roadway |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3633142A4 (en) | 2021-03-24 |
| EP3633142A1 (en) | 2020-04-08 |
| WO2018214659A1 (en) | 2018-11-29 |
| EP3633142B1 (en) | 2023-03-22 |
| CN107035401B (en) | 2018-04-10 |
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