CN113026678B - But take automatic tensioning function's reuse colliery underground reservoir dam body - Google Patents
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- CN113026678B CN113026678B CN202110364295.0A CN202110364295A CN113026678B CN 113026678 B CN113026678 B CN 113026678B CN 202110364295 A CN202110364295 A CN 202110364295A CN 113026678 B CN113026678 B CN 113026678B
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- 238000007789 sealing Methods 0.000 claims abstract description 59
- 239000003245 coal Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 5
- 238000001125 extrusion Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
Abstract
The invention discloses a recyclable coal mine underground reservoir dam body with an automatic tensioning function, which comprises a main structure, a first supporting telescopic frame, a second supporting telescopic frame, a third supporting telescopic frame, a fourth supporting telescopic frame, a sealing plate, a sealing air bag, a first frame connecting plate, a second frame connecting plate and a telescopic oil cylinder, wherein the first supporting telescopic frame is arranged on the main structure; the invention fully utilizes the change of water pressure in the underground reservoir, realizes automatic adjustment of the extrusion force of the artificial dam body and the coal body, can realize repeated use, has the advantages of simple structure, reliability, practicality and the like, greatly improves the sealing effect of the dam body, and reduces the dam building cost.
Description
Technical Field
The invention relates to an artificial dam body of a coal mine underground reservoir, in particular to a coal mine underground reservoir dam body which can be automatically tensioned according to the change of water pressure in the coal mine underground reservoir and can be repeatedly used, the water-resisting performance of the dam body can be effectively improved, and the construction and use cost of the dam body is reduced.
Background
Coal mining water resource protection and utilization are major technical problems of safe and green development of coal, mine water is generated by about 100 hundred million tons every year in coal development in China, but the effective utilization rate is only about 25%, and the mine water is directly discharged to the earth surface to cause large waste of water resources. The coal mine underground reservoir utilizes gaps and cracks of caving rocks in a working face goaf to store, filter, adsorb, exchange ions and the like mine water, and provides a new technical path for protecting and utilizing mine water resources.
An artificial dam body is required to be built for sealing a goaf of the coal mine underground reservoir, the dam body is mainly built by a cement wall, an anchor rod and an anchor cable in the traditional technology, but the cement wall and the coal body which are built manually are difficult to combine effectively, and the dam break is easy to occur under the action of the water pressure of the reservoir, so that safety accidents are caused. The patent with the application number of 201911222548.X discloses a box-type water retaining dam for a coal mine underground reservoir, which is mainly characterized in that a box-type structure is adopted, and box-type bodies are arranged in coal bodies on two sides, so that the tightness of the dam to the reservoir is improved; the patent with the application number of 201910087871.4 discloses a strong-slope seepage-resistant water retaining dam for a coal mine underground reservoir, which is mainly used for optimizing a connecting structure of a dam body and coal bodies on two sides and improving the seepage-resistant effect of a connecting part; the patent with the application number of 201910086889.2 discloses an I-shaped strong-side seepage-resistant water retaining dam for a coal mine underground reservoir, which still improves the seepage-resistant performance of the dam body by enhancing the joint of the dam body and a coal side; the patent with the application number of 201710484672.8 discloses a multi-layer grouting seepage-proofing reinforcing method for a coal mine underground reservoir and a reservoir dam body, and the connection strength of an artificial dam body and a coal body is improved by adopting a deep hole grouting mode.
The achievement of the patent mainly adopts the method of enhancing the strength of the joint of the dam body and the coal body so as to improve the seepage-proofing effect of the dam body, but the joint of the artificial dam body and the coal body is very easy to crack under the combined action of mine pressure and reservoir water pressure, the problems are difficult to solve by the traditional method, and the traditional reinforced water structure is high in manufacturing cost and difficult to realize recycling.
Disclosure of Invention
Based on this, it is necessary to innovate, research and develop and design a novel dam body of the coal mine underground reservoir aiming at the problems that the artificial dam body is poor in connection effect with the coal body, cannot realize recycling and the like, so that the extrusion force of the artificial dam body and the coal body can be automatically adjusted according to the water pressure change in the underground reservoir, repeated use can be realized for many times, and the construction and use cost of the coal mine underground reservoir is reduced.
The invention provides a recyclable coal mine underground reservoir dam body with an automatic tensioning function, which comprises: the device comprises a first bearing telescopic frame, a second bearing telescopic frame, a third bearing telescopic frame, a fourth bearing telescopic frame, a sealing plate, a sealing air bag, a first frame connecting plate, a second frame connecting plate and a telescopic oil cylinder;
the main structures of the first bearing telescopic frame, the second bearing telescopic frame, the third bearing telescopic frame and the fourth bearing telescopic frame are basically the same;
the number of the telescopic oil cylinders is four;
one end of the first bearing telescopic frame is arranged in one end of the second bearing telescopic frame and is connected with the second bearing telescopic frame through a built-in telescopic oil cylinder;
one end of the second bearing telescopic frame is arranged in one end of a third bearing telescopic frame and is connected with the third bearing telescopic frame through a built-in telescopic oil cylinder;
one end of the third bearing telescopic frame is arranged in one end of the fourth bearing telescopic frame and is connected with the fourth bearing telescopic frame through a built-in telescopic oil cylinder;
one end of the fourth bearing telescopic frame is arranged in one end of the first bearing telescopic frame and is connected with the first bearing telescopic frame through a built-in telescopic oil cylinder;
the sealing plate is hinged with the first bearing telescopic frame, the second bearing telescopic frame, the third bearing telescopic frame and the fourth bearing telescopic frame respectively;
the first frame connecting plate is hinged with the first bearing telescopic frame and the fourth bearing telescopic frame respectively;
the second frame connecting plate is hinged with the second bearing telescopic frame and the third bearing telescopic frame respectively;
the sealing air bag is arranged between the sealing plate and the first frame connecting plate and between the sealing air bag and the second frame connecting plate, and when the water pressure in the underground reservoir changes, lateral pressure is applied to the first bearing telescopic frame, the second bearing telescopic frame, the third bearing telescopic frame and the fourth bearing telescopic frame through the sealing air bag, so that the connection effect of the dam body and the coal body of the coal mine underground reservoir is improved.
The first bearing telescopic frame comprises a first telescopic sleeve, a second telescopic sleeve, a sealing plate hinge lug plate, a frame connecting plate hinge lug plate, a first supporting plate, a second supporting plate, a first telescopic oil cylinder hinge lug plate and a second telescopic oil cylinder hinge lug plate;
the external dimension of the second telescopic sleeve is the same as the internal dimension of the first telescopic sleeve, and the second telescopic sleeve of the first bearing telescopic frame can be arranged in the first telescopic sleeve of the second bearing telescopic frame;
the sealing plate hinge lug plate is used for connecting with the sealing plate;
the frame connecting plate hinge lug plate is used for connecting with the first frame connecting plate or the second frame connecting plate;
the first telescopic oil cylinder hinged lug plate is used for being connected with one end of a telescopic oil cylinder;
and the second telescopic oil cylinder hinged lug plate is used for being connected with one end of the telescopic oil cylinder.
Further, the sealing plate comprises a sealing bearing plate and a sealing hinge lug plate;
the connecting hole of the sealing and hinging lug plate is an elliptical hole.
Furthermore, the sealing airbag should be made of a flexible pressure-bearing material, can bear a certain pressure, and can be tightly attached to the first bearing telescopic frame, the second bearing telescopic frame, the third bearing telescopic frame and the fourth bearing telescopic frame, so that the sealing airbag plays a role in sealing and resisting water.
Still further, the first frame connecting plate and the second frame connecting plate have the same structure and comprise main body bearing plates and connecting lug plates;
the connecting holes for connecting the lug plates are elliptical holes.
Drawings
FIG. 1 is a schematic structural view of a reusable coal mine underground reservoir dam body with an automatic tensioning function according to the invention;
FIG. 2 is a schematic view of a sealed bladder;
FIG. 3 is a rear view of a reusable coal mine underground reservoir dam with an automatic tensioning function of the present invention;
FIG. 4 is a schematic sectional view taken along line A-A;
FIG. 5 is a schematic structural view of a first load-bearing telescoping frame;
FIG. 6 is a front view of the first load-bearing telescoping frame;
FIG. 7 is a schematic sectional view taken along line B-B;
FIG. 8 is a schematic view of a sealing plate structure;
fig. 9 is a schematic diagram of a first frame connecting plate structure.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The embodiment provides a recyclable coal mine underground reservoir dam body with an automatic tensioning function, and as shown in fig. 1 to 9, the main structure of the dam body comprises: the device comprises a first bearing telescopic frame 1, a second bearing telescopic frame 2, a third bearing telescopic frame 3, a fourth bearing telescopic frame 4, a sealing plate 5, a sealing air bag 6, a first frame connecting plate 7, a second frame connecting plate 8 and a telescopic oil cylinder 9;
the dam body of the coal mine underground reservoir comprises four telescopic oil cylinders 9;
one end of the first bearing telescopic frame 1 is arranged in one end of the second bearing telescopic frame 2 and is connected with the first bearing telescopic frame through a built-in telescopic oil cylinder 9, as shown in figures 1-4;
one end of the second bearing telescopic frame 2 is placed in one end of the third bearing telescopic frame 3 and is connected with the third bearing telescopic frame through a built-in telescopic oil cylinder 9;
one end of the third bearing telescopic frame 3 is arranged in one end of the fourth bearing telescopic frame 4 and is connected with the fourth bearing telescopic frame through a built-in telescopic oil cylinder 9;
one end of a fourth bearing telescopic frame 4 is arranged in one end of the first bearing telescopic frame 1 and is connected with the first bearing telescopic frame through a built-in telescopic oil cylinder 9;
the sealing plate 5 is respectively hinged with the first bearing telescopic frame 1, the second bearing telescopic frame 2, the third bearing telescopic frame 3 and the fourth bearing telescopic frame 4, and a connecting hole of the sealing plate 5 is a long elliptical hole, as shown in fig. 3;
the first frame connecting plate 7 is respectively hinged with the first bearing telescopic frame 1 and the fourth bearing telescopic frame 4, and a connecting hole of the first frame connecting plate 7 is a long elliptical hole;
the second frame connecting plate 8 is respectively hinged with the second bearing telescopic frame 2 and the third bearing telescopic frame 3, and a connecting hole of the second frame connecting plate 8 is a long elliptical hole;
the sealing air bag 6 is arranged between the sealing plate 5 and the first frame connecting plate 7 and the second frame connecting plate 8, when the water pressure in the underground reservoir changes, lateral pressure is applied to the first bearing telescopic frame 1, the second bearing telescopic frame 2, the third bearing telescopic frame 3 and the fourth bearing telescopic frame 4 through the sealing air bag 6, and the connecting effect of the dam body and the coal body of the coal mine underground reservoir is improved.
In one embodiment, the main structures of the first load-bearing telescopic frame 1, the second load-bearing telescopic frame 2, the third load-bearing telescopic frame 3 and the fourth load-bearing telescopic frame 4 are substantially the same, and the main structures include a first telescopic sleeve 11, a second telescopic sleeve 12, a sealing plate hinge lug plate 13, a frame connecting plate hinge lug plate 14, a first support plate 15, a second support plate 16, a first telescopic cylinder hinge lug plate 17 and a second telescopic cylinder hinge lug plate 18, which are shown in fig. 5 and 6;
the external dimension of the second telescopic sleeve 12 is the same as the internal dimension of the first telescopic sleeve 11, so that the second telescopic sleeve 12 of the first bearing telescopic frame 1 can be arranged in the first telescopic sleeve 11 of the second bearing telescopic frame 2;
the sealing plate hinge lug plate 13 is used for connecting with the sealing plate 5;
the frame connecting plate hinging lug plate 14 is used for connecting with the first frame connecting plate 7 or the second frame connecting plate 8;
the first telescopic oil cylinder hinged lug plate 17 is used for being connected with one end of the telescopic oil cylinder 9; the second telescopic cylinder hinge lug 18 is used for connecting with one end of the telescopic cylinder 9, as shown in fig. 7.
The sealing plate 5 comprises a sealing bearing plate 51 and a sealing hinge lug plate 52, which are shown in fig. 8;
the attachment hole of the sealing hinge lug plate 52 is an elliptical hole.
The sealing air bag 6 is made of a flexible pressure-bearing material, can bear certain pressure, can be tightly attached to a contact object, and plays a role in sealing.
The first frame connecting plate 7 and the second frame connecting plate 8 have the same structure, and comprise a main body pressure bearing plate 71 and a connecting lug plate 72, which are shown in fig. 9;
the connecting holes of the connecting ear plates 72 are elliptical holes.
The connection relationship and the use process of the recyclable coal mine underground reservoir dam body with the automatic tensioning function are described in detail by using specific embodiments.
Firstly, two ends of a telescopic oil cylinder 9 are respectively connected with a first telescopic oil cylinder hinged lug plate 17 of a third bearing telescopic frame 3 and a second telescopic oil cylinder hinged lug plate 18 of a fourth bearing telescopic frame 4, and a second telescopic sleeve 12 of the fourth bearing telescopic frame 4 is arranged in a first telescopic sleeve 11 of the third bearing telescopic frame 3;
by adopting the same connection mode, the first bearing telescopic frame 1 and the second bearing telescopic frame 2, the second bearing telescopic frame 2 and the third bearing telescopic frame 3, and the fourth bearing telescopic frame 4 and the first bearing telescopic frame 1 are respectively connected, and the size of the underground reservoir dam body of the coal mine is adjusted by using the telescopic oil cylinder 9 according to the actual requirements of the engineering site, so that the first bearing telescopic frame 1, the second bearing telescopic frame 2, the third bearing telescopic frame 3 and the fourth bearing telescopic frame 4 are respectively in close contact with the coal rock body;
then, the connecting ear plates 72 at the two ends of the first frame connecting plate 7 are respectively hinged with the first bearing telescopic frame 1 and the fourth bearing telescopic frame 4; connecting lug plates 72 at two ends of a second frame connecting plate 8 are respectively hinged with the second bearing telescopic frame 2 and the third bearing telescopic frame 3;
the sealed air bag 6 is arranged in an area enclosed by the first bearing telescopic frame 1, the second bearing telescopic frame 2, the third bearing telescopic frame 3 and the fourth bearing telescopic frame 4, and the sealed air bag 6 is inflated, so that the inflated sealed air bag 6 not only can play a water-resisting role, but also can exert certain pretightening force on the first bearing telescopic frame 1, the second bearing telescopic frame 2, the third bearing telescopic frame 3 and the fourth bearing telescopic frame 4;
finally, the sealing plate 5 is respectively connected with the first bearing telescopic frame 1, the second bearing telescopic frame 2, the third bearing telescopic frame 3 and the fourth bearing telescopic frame 4 to serve as a second waterproof wall;
the side of a first frame connecting plate 7 and a second frame connecting plate 8 of the dam body of the coal mine underground reservoir is contacted with water in the reservoir, when the water level in the underground reservoir rises, water pressure applies pressure to a sealing air bag 6 to enable the sealing air bag 6 to apply pressure to a first bearing telescopic frame 1, a second bearing telescopic frame 2, a third bearing telescopic frame 3 and a fourth bearing telescopic frame 4, and because a connecting hole of a sealing hinge lug plate 52 is an elliptical hole and a connecting hole of a connecting lug plate 72 is an elliptical hole, the first bearing telescopic frame 1, the second bearing telescopic frame 2, the third bearing telescopic frame 3 and the fourth bearing telescopic frame 4 can slightly move along the major axis direction of a first telescopic sleeve 11 and a second telescopic sleeve 12 under the action of the pressure of the sealing air bag 6, so that the contact effect of the dam body and the surrounding coal rock mass is improved, and the phenomenon of water seepage under the action of high water is prevented, the extrusion force of the artificial dam body and the coal body is automatically adjusted according to the water pressure change in the underground water reservoir;
when the reservoir is scrapped, the artificial dam body can be dismantled for the next underground reservoir, so that the reuse is realized, and the use cost is reduced.
The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.
The invention fully utilizes the change of water pressure in the underground reservoir, realizes automatic adjustment of the extrusion force of the artificial dam body and the coal body, can realize repeated use, has the advantages of simple structure, reliability, practicality and the like, greatly improves the sealing effect of the dam body, and reduces the dam building cost.
Claims (4)
1. The utility model provides a but take automatic tensioning function's reuse colliery underground reservoir dam body which characterized in that includes: the device comprises a first bearing telescopic frame, a second bearing telescopic frame, a third bearing telescopic frame, a fourth bearing telescopic frame, a sealing plate, a sealing air bag, a first frame connecting plate, a second frame connecting plate and a telescopic oil cylinder;
the main structures of the first bearing telescopic frame, the second bearing telescopic frame, the third bearing telescopic frame and the fourth bearing telescopic frame are the same;
the number of the telescopic oil cylinders is four;
one end of the first bearing telescopic frame is arranged in one end of the second bearing telescopic frame and is connected with the second bearing telescopic frame through a built-in telescopic oil cylinder;
one end of the second bearing telescopic frame is arranged in one end of a third bearing telescopic frame and is connected with the third bearing telescopic frame through a built-in telescopic oil cylinder;
one end of the third bearing telescopic frame is arranged in one end of the fourth bearing telescopic frame and is connected with the fourth bearing telescopic frame through a built-in telescopic oil cylinder;
one end of the fourth bearing telescopic frame is arranged in one end of the first bearing telescopic frame and is connected with the first bearing telescopic frame through a built-in telescopic oil cylinder;
the sealing plate is hinged with the first bearing telescopic frame, the second bearing telescopic frame, the third bearing telescopic frame and the fourth bearing telescopic frame respectively;
the first frame connecting plate is hinged with the first bearing telescopic frame and the fourth bearing telescopic frame respectively;
the second frame connecting plate is hinged with the second bearing telescopic frame and the third bearing telescopic frame respectively;
the sealing air bag is arranged between the sealing plate and the first frame connecting plate and the second frame connecting plate, and when the water pressure in the underground reservoir changes, lateral pressure is applied to the first bearing telescopic frame, the second bearing telescopic frame, the third bearing telescopic frame and the fourth bearing telescopic frame through the sealing air bag, so that the connection effect of the dam body and the coal body of the coal mine underground reservoir is improved;
the first bearing telescopic frame comprises a first telescopic sleeve, a second telescopic sleeve, a sealing plate hinge lug plate, a frame connecting plate hinge lug plate, a first supporting plate, a second supporting plate, a first telescopic oil cylinder hinge lug plate and a second telescopic oil cylinder hinge lug plate;
the external dimension of the second telescopic sleeve is the same as the internal dimension of the first telescopic sleeve, and the second telescopic sleeve of the first bearing telescopic frame can be arranged in the first telescopic sleeve of the second bearing telescopic frame;
the sealing plate hinge lug plate is used for connecting with the sealing plate;
the frame connecting plate hinge lug plate is used for connecting with the first frame connecting plate or the second frame connecting plate;
the first telescopic oil cylinder hinged lug plate is used for being connected with one end of a telescopic oil cylinder;
and the second telescopic oil cylinder hinged lug plate is used for being connected with one end of the telescopic oil cylinder.
2. The recyclable coal mine underground reservoir dam with the automatic tensioning function as claimed in claim 1, wherein the sealing plate comprises a sealing bearing plate, a sealing hinge lug plate;
the connecting hole of the sealing and hinging lug plate is an elliptical hole.
3. The recyclable coal mine underground reservoir dam with the automatic tensioning function as claimed in claim 1, wherein the sealing air bag is made of a flexible pressure-bearing material, can bear a certain pressure, and can be tightly attached to the first, second, third and fourth load-bearing telescopic frames to play a role in sealing and water isolation.
4. The recyclable coal mine underground reservoir dam with the automatic tensioning function as claimed in claim 1, wherein the first frame connecting plate and the second frame connecting plate are identical in structure and comprise a main body bearing plate and a connecting lug plate;
the connecting holes for connecting the lug plates are elliptical holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110364295.0A CN113026678B (en) | 2021-04-05 | 2021-04-05 | But take automatic tensioning function's reuse colliery underground reservoir dam body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110364295.0A CN113026678B (en) | 2021-04-05 | 2021-04-05 | But take automatic tensioning function's reuse colliery underground reservoir dam body |
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| CN113026678A CN113026678A (en) | 2021-06-25 |
| CN113026678B true CN113026678B (en) | 2022-02-22 |
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| CN202110364295.0A Active CN113026678B (en) | 2021-04-05 | 2021-04-05 | But take automatic tensioning function's reuse colliery underground reservoir dam body |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103422469B (en) * | 2013-08-14 | 2014-09-10 | 中国神华能源股份有限公司 | Artificial retaining dam for coal mine underground reservoir and connecting method of artificial retaining dam and coal pillar dam bodies as well as surrounding rocks |
| CN107237651B (en) * | 2017-06-23 | 2019-10-01 | 中国矿业大学 | A kind of multi-level grouting water-tight reinforcement means of coal mine underground reservoir and reservoir dam |
| CN109538295B (en) * | 2018-11-27 | 2020-07-31 | 中国神华能源股份有限公司 | Underground reservoir system for sealed mining area |
| CN109595034B (en) * | 2019-01-29 | 2019-10-29 | 中国矿业大学(北京) | Checkdam is seeped in the I-shaped strong side resistance of coal mine underground reservoir |
| CN109630195B (en) * | 2019-01-29 | 2020-05-19 | 中国矿业大学(北京) | Strong-wall seepage-blocking water retaining dam for coal mine underground reservoir |
| CN110987607B (en) * | 2019-12-27 | 2020-10-27 | 中国矿业大学(北京) | Nested multi-coupling model test system and test method for dam body of coal mine underground reservoir |
| CN111778933A (en) * | 2020-08-05 | 2020-10-16 | 安徽理工大学 | Diversion air bag dam protection structure of coal mine underground reservoir |
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