CN107237651A - A kind of multi-level grouting water-tight reinforcement means of coal mine underground reservoir and reservoir dam - Google Patents
A kind of multi-level grouting water-tight reinforcement means of coal mine underground reservoir and reservoir dam Download PDFInfo
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- CN107237651A CN107237651A CN201710484672.8A CN201710484672A CN107237651A CN 107237651 A CN107237651 A CN 107237651A CN 201710484672 A CN201710484672 A CN 201710484672A CN 107237651 A CN107237651 A CN 107237651A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
A kind of multi-level grouting water-tight reinforcement means of coal mine underground reservoir and reservoir dam, it is adaptable to coal mine underground construction field.Determine to set the area of groundwater reservoir and the position of coal column dam body by volume, tunnel groundwater reservoir both sides tunnel and withdraw tunnel, priority gunite concrete slurries and Ludox in wall, form concrete and Ludox spray-up, to both sides tunnel and withdraw tunnel and first constructed multiple shallow injected holes and hole-sealing grouting close to the side side of coal column dam body, after construct multiple deep injected holes and hole-sealing grouting, artificial checkdam enclosing tunnel is finally built, so as to form the coal mine underground reservoir of closing.Its coal column dam body to coal mine underground reservoir serves reinforcing and closing double effectses, and selected material is nanoscale and inorganic nature, and green high-efficient ensure that the antiseepage safety of coal column dam body, make coal mine underground reservoir lasting stability.
Description
Technical field
The present invention relates to a kind of coal mine underground reservoir and the multi-level grouting water-tight reinforcement means of reservoir dam, it is adaptable to applies
Work coal mine underground reservoir, underground storage chamber are used.
Background technology
In recent years, the center of gravity of coal in China production is gradually to western part transfer, and west area (Jin, Shaanxi and Inner Mongolia Ning Ganwu provinces and regions) are visited
Bright coal resources reserves account for the 71.6% of the whole nation, and its water resource only accounts for the 3.9% of national water resource, belongs to severe water deficient regions
Domain.Arrange ground outside Technique of Coal Mine Drainage now simultaneously and not only pollute environment, and be drained through a large amount of evaporations of Cheng Zhongshui outside and more exacerbate water
The shortage of resource, therefore the deficient of water resource turns into the bottleneck of restriction coal mining, in order to solve this problem, a kind of " ore deposit
The distributed storage method of well underground water " (CN102862775) arises at the historic moment, and this method is mined out using what is formed after coal mining
Area, goaf both sides tunnel and the coal column dam body for withdrawing tunnel, and the artificial checkdam built in tunnel are built into jointly
Coal mine underground reservoir.Water storage is carried out using huge goaf space, filtration, purification is carried out to water body using goaf spoil, then
Supplied water using nature pressure difference, realize the not outer row of mine water, underground water supply, drainage underground, sewage disposal, water damage prevent and treat,
The comprehensive benefit of environmental protection, is used comprehensively in infrared ray light shine.Safety is primary productive force, the safety of coal mine underground reservoir
Problem is also the most important thing, and the safety problem of coal mine underground reservoir is mainly the safety and stability problem of its coal column dam body, coal column dam
Body is by comprehensive functions such as ore deposit pressure, hydraulic pressure, once occur seepage failure, it will serious floods accident is caused, brings huge to colliery
Big personnel and economic loss, it is therefore necessary to consider the problems such as coal column dam body anti-blends reliability.For this safety problem
Research, " a kind of anti-seepage method for mine underground reservoirs " (CN102767395) is proposed with cement rendering dado layer, anti-seepage geotextile and water
Mud impervious barrier combines composition cut-pff wall to carry out antiseepage." anti-seepage method of groundwater reservoir and the ground with antiseepage function
Lower storage reservoir " (CN102926574) constructs antiseepage using antiseepage, normality, grinding coagulation soil and anti-seepage geotextile, smolmitza combination
Layer.But the cement used in the above method, inherently a kind of poromerics of concrete, it there is crack and crack；It is black
Clay does not only exist microcrack, microfissure and elapses over time, some seasons these cracks and crack can also develop expansion
Exhibition；Anti-seepage geotextile is due to the limitation of construction, it is impossible to be paved with whole tunnel face, in addition after the completion of geotextiles construction, or it is many or
Few always have some defects, including the bad formation of joining quality seam, construction when be punctured, by lower packing course bursting, tunnel
These defects such as the uneven tear geotextiles of wall directly affect the barrier performance of dam body.
Due to presence of the above-mentioned research method using crack, crack caused by the shortcoming and defect of material, in a short time dam
Body has certain anti-seepage effect, but coal mine underground reservoir is a prolonged water storage place, over time, underground water
Water and hydrone in storehouse are oozed slowly by microfissure, ultimately cause the immersion for a long time of coal column dam body, and intensity decreases, unstability is broken
Bad, water body pours out in reservoir, causes great colliery floods accident.Therefore existing method all can not fundamentally solve dam
The antiseepage problem of body.
The content of the invention
Technical problem：For above-mentioned technology weak point there is provided a kind of method is simple, create convenient, using concrete,
Cement mortar and nanometer materials Ludox, you can the multi-level slip casting of the coal mine underground reservoir and reservoir dam of effective waterproof is prevented
Ooze reinforcement means.
Technical scheme：To realize above-mentioned technical purpose, a kind of coal mine underground reservoir of the invention, it includes empty as water storage
Between coal mine gob space, coal mine gob space above be face roof, lower section is floor undulation, coal mine gob
Both sides tunnel is tunneled out in space symmetr both sides respectively, and withdraws tunnel and artificial checkdam, both sides in other symmetrical both sides construction
Tunnel and tunnel is withdrawn provided with anchor, and be successively provided with concrete layer and silica sol layer in outer layer, both sides tunnel and return
Multiple shallow injected holes and multiple deep injected holes are inserted between the side side construction above for the close coal column dam body for removing tunnel.
A kind of multi-level grouting water-tight reinforcement means of the coal mine underground reservoir dam of coal mine underground reservoir, according to the hydrology
Matter data determines bank underground water content, the volume according to needed for water content calculates water storage, and is configured by volume determination
The area of lower storage reservoir and the position of coal column dam body, tunnel groundwater reservoir both sides tunnel and withdraw tunnel, in wall successively
Gunite concrete slurries and Ludox, form concrete and Ludox spray-up, to both sides tunnel and withdraw tunnel close to coal column dam
The side side of body is first constructed multiple shallow injected holes and hole-sealing grouting, and construct afterwards multiple deep injected holes and hole-sealing grouting finally build people
Work checkdam enclosing tunnel, so as to form the coal mine underground reservoir of closing.
Comprise the following steps that：
A. according to needed for hydrogeologic data determines bank underground water content, calculating storage bank underground water content
Groundwater reservoir volume, using working face mining height as height and with reference to coal mining region coefficient of storage, determines the area that groundwater reservoir needs,
So as to be determined to set the position of groundwater reservoir coal column dam body according to goaf；
B. with the exploitation in coal seam, groundwater reservoir both sides tunnel is normally tunneled out at selected groundwater reservoir construction and is returned
Tunnel is removed, change and the hole cranny development of each roadway surrounding rock property are monitored when tunneling groundwater reservoir both sides tunnel and withdrawing tunnel
Situation；
C. with groundwater reservoir both sides tunnel and the driving for withdrawing tunnel, to the both sides tunnel that has constituted and tunnel lane is withdrawn
Road wall is anchored, and the gunite concrete slurries in wall, after after concrete slurry solidification, to tunnel close to coal column dam body
Side side concrete outer layer spray Ludox again；
D. after after the solidification of Ludox spray-up, to both sides tunnel and to withdraw tunnel multiple shallow close to the side side construction of coal column dam body
Injected hole, and inject cement mortar；
E. after after the cement slurry sets that shallow injected hole is noted, tunnel is constructed multiple deep slip castings close to the side side of coal column dam body
Hole, and Ludox is injected, wait Ludox solidification；
F. after the completion of coal-face back production, it is determined that groundwater reservoir built between the coal column dam body of main entry manually
Checkdam enclosing tunnel, so as to form the coal mine underground reservoir of closing.
Concrete thickness after the concrete slurry solidification is 50-100mm, and the silica gel thickness after Ludox solidification is sprayed again
2-5mm, the Ludox used is the nanometer materials that granularity is 8-20nm.
The length of the shallow injected hole is 1.5-2.5m, and grouting pressure is 1-2MPa.
The length of the deep injected hole is 4-6m, and grouting pressure is 0.5-0.8MPa.
The shallow injected hole and deep injected hole arrangement interleave setting, are specially to be pressed in tunnel on the side side of coal column dam body
It is arranged alternately according to the deep injected hole of a row below the shallow injected hole of a row.
Beneficial effect：
The application protects coal column dam body surface using concrete and Ludox spray-up, effectively prevents table after the compression of coal column dam body
Face avalanche；Injection cement mortar primarily serves dam body consolidation fracture area country rock, changes dam body stress, lifts coal column dam body intensity
Effect；The Ludox of injection is filled into micropore crack, blocks hydrone seepage channel, forms one layer of fine and close wall, thoroughly
Hinder the seepage flow of hydrone.Material Ludox used in this application, particle is careful, and the property noted is very high, is easy to be packed into fine fisssure
Seam, micropore, and with the lengthening of time, consolidate gel, effectively block micropore crack.Other Ludox is a kind of inorganic material
Material, its composition is nontoxic, to water body nonstaining property, it can be ensured that the safety of water quality.
The effect of reservoir coal column dam body in itself, concrete, cement mortar, Ludox three and coal column dam body sheet are given full play to
Body is fitted close, and is collectively forming one and is blocked up fine and close reinforcing anti-seepage wall, rather than simple use material separately builds a stifled cut-pff wall, its
The effect of reinforcing anti-seepage also will be many times than the effect of simple cut-pff wall.
Due to the concrete used, cement mortar, Ludox property is constantly to condense reinforcing over time, so with
The increase of time, the reinforcing anti-seepage effect of coal column dam body is more stable, and coal mine underground reservoir safety is more solid and reliable, is available for long-term
Water storage.
From coal column dam body surface to coal column dam body, inside carries out many gradient anti-seepage reinforcings.Gunite concrete protects table, injects water
Mud mainly plays reinforcement effect, and injection Ludox filling micropore crack antiseepage, three's division of labor is clear and definite, works closely, combines coal column
Dam body forms a range of fine and close anti-seepage reinforcing layer in itself, on the one hand strengthens dam body, dam body is effectively kept out
Ore deposit pressure, hydraulic pressure effect, another aspect nanometer materials Ludox block the micropore crack passage needed for water and hydrone infiltration, delay
The great colliery floods accident that solution is likely to result in due to the presence in micropore crack.Method is simple, creates convenient, using concrete,
Cement mortar and nanometer materials Ludox, Stability Analysis of Structures, water resistance are good.
Brief description of the drawings
Fig. 1 is the coal mine underground reservoir structural representation of the present invention.
Fig. 2 is the coal column dam body preventing slurry injection front view of the present invention.
Fig. 3 is the coal column dam body preventing slurry injection side view of the present invention.
In figure：1- coal column dam bodys；2- both sides tunnel；3- withdraws tunnel；4- coal-faces；5- stope drift active workings；6- is artificial
Checkdam；7- main entrys；8- goafs；9- concrete and Ludox spray-up；10- Grouting Pipes；The shallow injected holes of 11-；12- depth slip castings
Hole；13- overlying rocks；Rock stratum under 14-.
Embodiment
One embodiment of the present of invention is further described below in conjunction with the accompanying drawings：
As shown in figure 1, the coal mine underground reservoir of the present invention, it includes the coal mine gob space as water space, coal
Ore goaf space above is overlying rock 13, and lower section is lower rock stratum 14, and coal mine gob space symmetr both sides are tunneled respectively
Go out both sides tunnel 2, and tunnel 3 and artificial checkdam 6 are withdrawn in other symmetrical both sides construction, both sides tunnel 2 and withdraw tunnel 3
Anchor is provided with, and concrete layer and silica sol layer are successively provided with outer layer, both sides tunnel 2 and the close of tunnel 3 is withdrawn
Multiple shallow injected holes 11 and multiple deep injected holes 12 are inserted between the side side construction of coal column dam body 1 is upper.
As shown in Figures 2 and 3, the multi-level grouting water-tight reinforcement means of coal mine underground reservoir dam of the invention, according to
Hydrogeologic data determines bank underground water content, the volume according to needed for water content calculates water storage, and is determined by volume
The area of groundwater reservoir and the position of coal column dam body 1 are set, groundwater reservoir both sides tunnel 2 is tunneled and withdraws tunnel 3, in tunnel
Priority gunite concrete slurries and Ludox on wall, form concrete and Ludox spray-up 9, to both sides tunnel 2 and withdraw tunnel 3
First constructed multiple shallow injected holes 11 and hole-sealing grouting, construct afterwards multiple deep injected holes 12 and sealing of hole close to the side side of coal column dam body 1
Slip casting, finally builds the artificial enclosing tunnel of checkdam 6, so as to form the coal mine underground reservoir of closing.
Comprise the following steps that：
A. according to needed for hydrogeologic data determines bank underground water content, calculating storage bank underground water content
Groundwater reservoir volume, using working face mining height as height, and refers to certain coefficient of storage, determines the area that groundwater reservoir needs,
So as to the position of the groundwater reservoir coal column dam body 1 according to the determination of goaf 8 groundwater reservoir；
B. with the exploitation in coal seam, the He of groundwater reservoir both sides tunnel 2 normally tunneled out at selected groundwater reservoir construction
Tunnel 3 is withdrawn, the change of monitoring roadway surrounding rock property and porous dehiscence gap when tunneling groundwater reservoir both sides tunnel 2 and withdrawing tunnel 3
The situation of development；
C. with groundwater reservoir both sides tunnel and the driving for withdrawing tunnel, the wall to composition is anchored, and upper
Gunite concrete slurries in wall between rock stratum 13 and lower rock stratum 14, after after concrete slurry solidification, are leaned on to tunnel
Coal column dam body side side concrete outer layer sprays Ludox again, ultimately forms concrete and Ludox spray-up 9；Wherein concrete slurry coagulates
Gu after concrete thickness be 50-100mm, again spray Ludox solidification after silica gel thickness 2-5mm, Ludox is that granularity is 8-
20nm nanometer materials；
D. after after the solidification of Ludox spray-up, tunnel is constructed shallow injected hole 11 close to the side side of coal column dam body, and utilize note
The injection cement mortar of pipe 10 is starched, the length of the shallow injected hole 11 is 1.5-2.5m, and grouting pressure is 1-2MPa；
E. after after the cement slurry sets in injected hole, tunnel is constructed deep injected hole 12 close to the side side of coal column, and utilizes
Grouting Pipe 10 injects Ludox, waits Ludox solidification, the length of the deep injected hole 12 is 4-6m, and grouting pressure is 0.5-
0.8MPa；
F. after the completion of coal-face back production, it is determined that groundwater reservoir build people between the coal column dam body 1 of main entry 7
The enclosing tunnel of work checkdam 6, it is anti-that the artificial dam body 6 is followed successively by brick mix structure supporting layer, spoil or the structure of loess from inside to outside
The composite construction that concrete in infiltration layer and embedded coal column is constituted, so as to form the coal mine underground reservoir of closing；
The crack of formation after being collapsed using top plate constitutes groundwater reservoir water space, and the underground water produced during coal mining is natural
Seepage flow is to the groundwater reservoir water space.
Embodiment 1：
Certain colliery coal seam overlying aquifer 0.10m~27.48m, average 8.24m, goaf constantly receives surface water, loosely
The supply of aquifer water and bedrock aquifer water, mine norm al discharge rate is 486m3/ h, hydrogeological type of mine is medium.
Consider that coefficient of storage determines to build a complete coal mine underground reservoir, underground by six work face goafs after calculating
Reservoir both sides tunnel 2 is rectangular cross section, the high 4.4m in tunnel, the wide 30m of coal column dam body with tunnel equal 3 is withdrawn.
Groundwater reservoir both sides tunnel 2 and withdraw tunnel 3 tunnel after, the wall to composition is anchored in time, after anchoring
Gunite concrete slurries in the wall between overlying rock 13 and lower rock stratum 14, are mixed after after concrete slurry solidification immediately
Solidifying soil outer layer sprays Ludox again, ultimately forms concrete and Ludox spray-up 9, the jet thickness of concrete is 100mm, and silicon is sprayed again
Colloidal sol, thickness is 2mm；Used concrete, three kinds of material parameters of cement mortar and Ludox are：Normal concrete, cement mortar
The ratio of mud=0.8:1；Ludox A expects：B material=4:1, A material is silicon dioxide colloid, and B material are catalyst sodium chloride solution,.
After concrete and Ludox spray-up 9 condense, in tunnel close to the shallow injected hole 11 of side side construction of coal column dam body, hole depth
2m, spacing and array pitch are 20 ° of shallow injected hole and horizontal direction angle at the top and bottom of 1.5m, dam body, and remaining shallow injected hole is equal
Vertical perforating, refers to Fig. 2, installs Grouting Pipe 10 and sealing of hole, injects cement mortar, grouting pressure is 1.5MPa, voltage stabling control
20min。
After the cement mortar of injection condenses, deep note Ludox, Ludox A material are carried out：B material=9:1, in tunnel close to coal column
The deep injected hole 12 of side side construction of dam body, hole depth 4m, spacing and array pitch are 1.5m, the deep equal vertical perforating of injected hole, refer to figure
2, grouting pressure is 0.5MPa, voltage stabling control 120min.
Scene shows, the multi-level grouting water-tight reinforcement means of a kind of coal mine underground reservoir dam of invention, to coal column dam
Body serves reinforcing and antiseepage double effectses, adds the reliability of coal mine underground reservoir.
Claims (7)
1. a kind of coal mine underground reservoir, it is characterised in that：It includes the coal mine gob space as water space, and colliery is mined out
Area space above is face roof, and lower section is floor undulation, and both sides are tunneled out in coal mine gob space symmetr both sides respectively
Tunnel, and tunnel and artificial checkdam are withdrawn in other symmetrical both sides construction, both sides tunnel is filled with tunnel is withdrawn provided with anchoring
Put, and concrete layer and silica sol layer, both sides tunnel and the side side for the close coal column dam body for withdrawing tunnel are successively provided with outer layer
Multiple shallow injected holes and multiple deep injected holes are inserted between in construction.
2. the multi-level grouting water-tight of the coal mine underground reservoir dam of coal mine underground reservoir is reinforced described in a kind of usage right requirement 1
Method, it is characterised in that：Bank underground water content is determined according to hydrogeologic data, according to needed for water content calculates water storage
Volume, and determine the area of setting groundwater reservoir and the position of coal column dam body, to tunnel groundwater reservoir both sides tunnel by volume
With withdraw tunnel, priority gunite concrete slurries and Ludox in wall form concrete and Ludox spray-up, to both sides
Tunnel and withdraw tunnel and first constructed multiple shallow injected holes and hole-sealing grouting, multiple deep slip castings of constructing afterwards close to the side side of coal column dam body
Hole and hole-sealing grouting, finally build artificial checkdam enclosing tunnel, so as to form the coal mine underground reservoir of closing.
3. the multi-level grouting water-tight reinforcement means of coal mine underground reservoir dam as claimed in claim 2, it is characterised in that tool
Body step is as follows：
A. bank underground water content is determined according to hydrogeologic data, calculates the ground needed for storage bank underground water content
Lower storage reservoir volume, using working face mining height as height and with reference to coal mining region coefficient of storage, determines the area that groundwater reservoir needs, from
And determined to set the position of groundwater reservoir coal column dam body according to goaf；
B. with the exploitation in coal seam, groundwater reservoir both sides tunnel is normally tunneled out at selected groundwater reservoir construction and is withdrawn
Tunnel, in driving groundwater reservoir both sides tunnel and the change and hole cranny development that each roadway surrounding rock property is monitored when withdrawing tunnel
Situation；
C. with groundwater reservoir both sides tunnel and the driving for withdrawing tunnel, to the both sides tunnel that has constituted and tunnel tunnel is withdrawn
Wall is anchored, and the gunite concrete slurries in wall, after after concrete slurry solidification, to tunnel close to coal column dam body
Side side concrete outer layer sprays Ludox again；
D. after after the solidification of Ludox spray-up, to both sides tunnel and withdraw tunnel and constructed multiple shallow notes close to the side side of coal column dam body
Hole is starched, and injects cement mortar；
E. after after the cement slurry sets that shallow injected hole is noted, tunnel is constructed multiple deep injected holes close to the side side of coal column dam body, and
Ludox is injected, Ludox solidification is waited；
F. after the completion of coal-face back production, it is determined that groundwater reservoir artificial gear is built between the coal column dam body of main entry
Dam enclosing tunnel, so as to form the coal mine underground reservoir of closing.
4. the multi-level grouting water-tight reinforcement means of coal mine underground reservoir dam as claimed in claim 3, it is characterised in that：Institute
It is 50-100mm to state the concrete thickness after concrete slurry solidification, and the silica gel thickness 2-5mm after Ludox solidification is sprayed again, is used
Ludox be nanometer materials that granularity is 8-20nm.
5. the multi-level grouting water-tight reinforcement means of coal mine underground reservoir dam as claimed in claim 3, it is characterised in that：Institute
The length for stating shallow injected hole is 1.5-2.5m, and grouting pressure is 1-2MPa.
6. the multi-level grouting water-tight reinforcement means of coal mine underground reservoir dam as claimed in claim 3, it is characterised in that：Institute
The length for stating deep injected hole is 4-6m, and grouting pressure is 0.5-0.8MPa.
7. the multi-level grouting water-tight reinforcement means of the coal mine underground reservoir dam as described in claim 5 or 6, its feature exists
In：The shallow injected hole and deep injected hole arrangement interleave settings, specially tunnel on the side side of coal column dam body according to one
The deep injected hole of a row below shallow injected hole is arranged to be arranged alternately.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710484672.8A CN107237651B (en) | 2017-06-23 | 2017-06-23 | A kind of multi-level grouting water-tight reinforcement means of coal mine underground reservoir and reservoir dam |
| PCT/CN2018/078279 WO2018233320A1 (en) | 2017-06-23 | 2018-03-07 | Coal mine underground reservoir and multi-layer grouting-based anti-seepage reinforcement method for reservoir dam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710484672.8A CN107237651B (en) | 2017-06-23 | 2017-06-23 | A kind of multi-level grouting water-tight reinforcement means of coal mine underground reservoir and reservoir dam |
Publications (2)
| Publication Number | Publication Date |
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| CN107237651A true CN107237651A (en) | 2017-10-10 |
| CN107237651B CN107237651B (en) | 2019-10-01 |
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| CN201710484672.8A Active CN107237651B (en) | 2017-06-23 | 2017-06-23 | A kind of multi-level grouting water-tight reinforcement means of coal mine underground reservoir and reservoir dam |
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| WO (1) | WO2018233320A1 (en) |
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| WO2018233320A1 (en) * | 2017-06-23 | 2018-12-27 | 中国矿业大学 | Coal mine underground reservoir and multi-layer grouting-based anti-seepage reinforcement method for reservoir dam |
| CN109236373A (en) * | 2018-08-27 | 2019-01-18 | 清华大学 | A kind of pervasive coal mine underground reservoir and its method of construction |
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| WO2018233320A1 (en) * | 2017-06-23 | 2018-12-27 | 中国矿业大学 | Coal mine underground reservoir and multi-layer grouting-based anti-seepage reinforcement method for reservoir dam |
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| CN116219949A (en) * | 2023-02-07 | 2023-06-06 | 国能经济技术研究院有限责任公司 | Artificial dam structure of coal mine underground reservoir and coal mine underground reservoir |
| CN116219949B (en) * | 2023-02-07 | 2023-12-22 | 国能经济技术研究院有限责任公司 | Artificial dam structure of coal mine underground reservoir and coal mine underground reservoir |
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| WO2018233320A1 (en) | 2018-12-27 |
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