CN109026152B - Open pit coal mine underground reservoir containing core wall rock-fill retaining dam structure - Google Patents
Open pit coal mine underground reservoir containing core wall rock-fill retaining dam structure Download PDFInfo
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- CN109026152B CN109026152B CN201810983622.9A CN201810983622A CN109026152B CN 109026152 B CN109026152 B CN 109026152B CN 201810983622 A CN201810983622 A CN 201810983622A CN 109026152 B CN109026152 B CN 109026152B
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- core wall
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- rock
- open pit
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- 239000003245 coal Substances 0.000 title claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000002689 soil Substances 0.000 claims abstract description 12
- 239000002910 solid waste Substances 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 6
- 239000002352 surface water Substances 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 26
- 238000007599 discharging Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000013502 plastic waste Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- 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
Abstract
The invention provides an open pit coal mine underground reservoir with a core wall rock-fill retaining dam structure, which comprises an open pit coal mine pit used as a water storage space, core wall retaining dams arranged in the open pit coal mine pit, rock-fill arranged at the front side and the rear side of the core wall retaining dams and used as water storage bodies, and inner earth-fill filled on the rock-fill and discharged by inner earth-fill operation, wherein the core wall retaining dams comprise a plurality of core wall retaining dams which are sequentially constructed according to the inner earth-fill operation direction, the plurality of core wall retaining dams divide the open pit coal mine pit into a plurality of underground water storage spaces, each core wall retaining dam is constructed in a multi-stage manner along with the inner earth-fill operation, a water conveying pipe network is arranged among the plurality of underground water storage spaces, water regulation and water intake among different reservoirs are ensured, and an impermeable layer paved by solid wastes is arranged at the bottom of the rock-fill. The open pit coal mine underground reservoir with the core wall rock-fill retaining dam structure effectively combines the soil discharging operation in the open pit coal mine with the construction of the underground reservoir, and realizes the safe and efficient construction of the open pit coal mine underground reservoir.
Description
Technical Field
The invention belongs to the technical field of intersection of mining engineering and hydraulic engineering, and particularly relates to an open pit coal mine underground reservoir with a core wall rock-fill retaining dam structure.
Background
The eastern grassland large-scale coal electric base is ecologically fragile, the land desertification is extremely easy to be caused by the open pit mining, and the underground water operation system is polluted and destroyed. Therefore, the construction of the underground reservoir of the open pit coal mine has an important water resource protection effect on ecological restoration of the large-scale coal-electricity base of the eastern grassland.
The coal body is mined after the soil layer of the ground surface rock is stripped in the open pit mining, and then the goaf is backfilled with the earth surface rock soil layer stripping material, wherein the goaf is called an internal dumping site which is the main selection address for the underground reservoir construction of the open pit. For the design of an underground reservoir of an open pit coal mine, how to realize the rapid construction of the underground reservoir in a dumping site in the open pit coal mine, how to solve the problems of the construction of the underground reservoir and the internal dumping operation, how to coordinate the construction period relation between the internal dumping operation and the construction of a retaining dam and how to effectively store and utilize water, and the problems are urgent to consider and solve for the construction of the underground reservoir of the open pit coal mine.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the open pit coal mine underground reservoir which can coordinate the construction period relation between the internal dumping operation and the construction of the retaining dam, has reasonable layout design and can be safely and efficiently constructed and comprises a core wall rock-fill retaining dam structure.
In order to solve the technical problems, the invention provides an open-pit coal mine underground reservoir comprising a core wall rock-fill retaining dam structure, which comprises an open-pit coal mine pit used as a water storage space, core wall retaining dams arranged in the open-pit coal mine pit, rock-fill arranged at the front side and the rear side of the core wall retaining dams and used as water storage bodies, and inner earth-fill filled on the rock-fill and discharged by inner earth-fill operation, wherein the core wall retaining dams comprise a plurality of core wall retaining dams which are sequentially constructed according to the inner earth-fill operation direction, the core wall retaining dams divide the open-pit coal mine pit into a plurality of underground water storage spaces, each core wall retaining dam is constructed in multiple stages along with the inner earth-fill operation, a water conveying pipe network is arranged among the underground water storage spaces, water regulating and water taking among different reservoirs are ensured, and an impermeable layer formed by paving solid wastes is arranged at the bottom of the rock-fill.
Further, the core wall dam is formed by concrete casting or soil Dan Nianya.
Further, the dam foundation depth of the first-stage core wall retaining dam of the core wall retaining dam is 10-15m, the slope angle of each-stage core wall retaining dam is 87 degrees, the dam top width of the last-stage core wall retaining dam is 10-15m, the relation between the total height H n of the core wall retaining dam and the pit depth H of the open pit coal mine is H=H n +10m, and the relation between the maximum width W of the core wall retaining dam and the pit depth H of the open pit coal mine is W=20m+ (H-10 m)/tan 87 degrees.
Further, the filling height of the inner earth discharge on the rockfill is equal to the height of the core wall water retaining dam.
Further, the rockfill is formed by inclined stacking of rubble, or material having a spatial hole and/or cavity structure, along the core wall dam.
Further, the stacking gradient of the rockfill is 25-33 degrees.
Further, the thickness Hs of the impermeable layer is 1-1.5m.
Further, the water delivery pipe network comprises an underground water delivery pipe buried in the water storage body and an earth surface water delivery pipe which is arranged on the surface layer of the inner soil discharge and is communicated with the underground water delivery pipe through a vertical pipeline.
According to the open pit coal mine underground reservoir with the core wall rock-fill retaining dam structure, the earth discharging operation in the open pit coal mine is effectively combined with the underground reservoir construction, the core wall rock-fill retaining dam structure type underground reservoir construction is designed, and the core wall rock-fill retaining dam is constructed in multiple stages and multiple periods on the premise that the inner earth discharging operation is not influenced, so that the open pit coal mine underground reservoir is constructed safely and efficiently. In addition, the underground reservoir design of the core wall rock-fill retaining dam structure is adopted, the dam body structure is formed by combining core walls and rock-fill, and is of a typical strong and weak combined structure, and the discrete rock-fill not only can play a role in water storage, but also has an energy absorption and clipping function, so that the underground reservoir adopting the core wall rock-fill retaining dam structure has quite stable structural earthquake resistance. Meanwhile, the bottom of the underground reservoir is ground and paved by solid wastes such as mine gangue, buildings or plastics and the like to serve as an impermeable layer, so that the engineering requirement of the bottom for impermeable is met, and the green construction concept of changing waste into valuables is realized.
Drawings
FIG. 1 is a cross-sectional view of an overall design of an underground reservoir of an opencast coal mine including a core wall rock-fill dam structure provided by an embodiment of the invention;
FIG. 2 is a partial cross-sectional view of an underground reservoir of an opencast coal mine including a core wall rock-fill dam structure provided by an embodiment of the invention;
FIG. 3 is a plan layout view of an underground reservoir of an opencast coal mine including a core wall rock-fill dam structure provided by an embodiment of the invention;
Fig. 4 is a first stage construction design diagram of a core wall retaining dam of an underground reservoir of an opencast coal mine, which comprises a core wall rock-fill retaining dam structure according to an embodiment of the invention.
Detailed Description
Referring to fig. 1,2 and 3, an open pit coal mine underground reservoir including a core rock-fill dam structure according to an embodiment of the present invention includes an open pit coal mine pit 10 serving as a water storage space, core rock-fill dams 20 disposed in the open pit coal mine pit 10, rock-fill 30 disposed on both front and rear sides of the core rock-fill dams 20 serving as a water storage body, and inner-discharge soil 40 filled on the rock-fill 30 and discharged by an inner-discharge operation, and a filling height of the inner-discharge soil 40 on the rock-fill 30 is equal to a height of the core rock-fill dams 20. The core wall retaining dam 20 is formed by concrete casting or soil Dan Nianya, and the core wall retaining dam 20 comprises a plurality of core wall retaining dams which are sequentially constructed along the inner dumping operation direction, so that the plurality of core wall retaining dams divide the opencast coal mine pit 10 into a plurality of underground water storage spaces, namely a plurality of underground reservoirs such as No. 1, no. 2, no. 3, no. 4 and the like. Each core wall dam 10 is constructed in multiple stages along with the inner dumping operation, that is, each core wall dam 10 is constructed in multiple stages such as 1,2,3, 4 …, etc.
Referring to fig. 4, the first stage core dam of each core dam 20 has a dam foundation depth of 10-15m, which enables the core dams 20 to stand stably in the underground reservoir; the slope angle of each level of core wall retaining dam is 87 degrees, namely the core wall retaining dam 20 is basically similar to a straight wall type, and the core wall retaining dam with the structure has good stability, is convenient to construct and is simple to construct; the width of the top of the last-stage core wall dam is 10-15m, the total height H n of the core wall dam 20 is determined by the relation formula H=H n +10m with the pit depth H of the opencast coal mine, and the maximum width W of the core wall dam 20, namely the width W of the first-stage core wall dam is determined by the relation formula W=20m+ (H-10 m)/tan 87 DEG with the pit depth H of the opencast coal mine.
The rockfill 30 is formed by obliquely stacking a rubble with pores or cracks or other materials with space holes, cavity structures or space holes and cavity structures along the core wall retaining dam 20, and the stacking gradient of the rockfill 30 is preferably set to 25-33 degrees in order to facilitate the stacking construction of the rockfill 30. The rock-fill materials have low cost and adsorption and filtration functions, not only can ensure the effective purification and storage of underground water bodies, but also can form a typical strong and weak combined structure by combining the discrete rock-fill and the core wall rock-fill retaining dam, and can play a role in energy absorption and clipping, so that the underground reservoir has quite stable structural earthquake resistance. The water storage body material is preferably formed by obliquely stacking along the core wall water retaining dam.
In order to ensure water transfer and water intake among different underground reservoirs, a water delivery pipe network is arranged among a plurality of underground reservoirs such as No. 1, no. 2, no. 3, no. 4 and the like formed by a plurality of underground water storage spaces. Wherein the water delivery pipe network comprises underground water delivery pipes 61 buried in the rockfill 30 as a water storage body, and surface water delivery pipes 62 arranged in the surface layer of the inner earth 40 and communicated with the underground water delivery pipes 61 through vertical pipes 63, underground water delivery pipes 61 parallel to the side by side of the core wall retaining dam 20 are arranged under the rockfill 30 of each underground water reservoir, all the underground water delivery pipes 61 are communicated with the plurality of surface water delivery pipes 62 through the plurality of vertical pipes 63 to form the water delivery pipe network, and a plurality of water taking stations 70 communicated with the surface water delivery pipes 62 are built on the surface layer of the inner earth 40 of each underground water reservoir at certain intervals along the vicinity of the core wall retaining dam 20 for convenience of water regulation and water taking.
In addition, in order to make the underground reservoirs have better water storage capacity, an impermeable layer 50 is arranged at the bottom of the rock pile 30 of each underground reservoir, the impermeable layer 50 is formed by paving solid waste such as waste gangue of coal mine, construction waste or plastic waste, and paving clay on the surface layer of the solid waste for rolling, and in order to achieve the best impermeable effect without increasing the construction cost due to prolonging the construction period, the thickness Hs of the impermeable layer 50 is set to be 1-1.5 m. The underground reservoir bottom is ground and paved by solid wastes such as mine gangue, buildings or plastics, so that not only is the engineering requirement of the bottom for seepage prevention met, but also the green construction concept of changing waste into valuables is realized, and the method has important significance for ecological restoration of mines and water resource protection.
When constructing an underground reservoir of an opencast coal mine including a core wall rock-fill dam structure, a pit of a goaf of the opencast coal mine is selected as an underground water storage space 10, a first-stage retaining dam of a first core wall retaining dam 20 is constructed at a certain distance from an inner dumping site of the goaf of the opencast coal mine near a side slope of the opencast coal mine, and rock-fill 30 is stacked along the core wall retaining dam 20 on both front and rear sides of the core wall retaining dam 20. When the stacking height of the rock-fill 30 is level with the first stage retaining dam of the first core wall retaining dam 20, the inner dumping 40 discharged from the inner dumping site is filled on the rock-fill 30 on the side close to the inner dumping site until the height of the inner dumping 40 is level with the first stage retaining dam of the core wall retaining dam 20. When the height of the inner discharging soil 40 is leveled with the first stage retaining dam of the core wall retaining dam 20, the construction of the second stage retaining dam on the first stage retaining dam, the stacking of the rockfill 30, and the filling of the inner discharging soil 40 are continued as described above until the total height of the core wall retaining dam 20 reaches H n. Naturally, before stacking the rockfill 30, the impermeable layer 50 is laid at the bottom of the warehouse, the underground water pipe 61 parallel to the parallel arrangement of the core wall retaining dam 20 is laid under the rockfill 30 on the impermeable layer, and the vertical pipeline 63 communicated with the underground water pipe 61 is buried in the rockfill 30. When the construction of the first core wall retaining dam 20 is completed and the inner earth 40 filled on the rock-fill 30 near the side of the inner earth-discharge site is leveled with the first core wall retaining dam 20, the construction of the second core wall retaining dam 20, the stacking of the rock-fill 30 and the filling of the inner earth-discharge 40 are performed according to the above method, and so on, the multi-stage construction of the core wall retaining dam 20, the stacking operation of the rock-fill 20 and the filling of the inner earth-discharge 40 are sequentially completed until the whole underground reservoir is completed, thereby effectively combining the inner earth-discharge operation of the open-pit coal mine with the construction of the underground reservoir, and constructing the core wall rock-fill retaining dam in multiple stages and periods under the premise of ensuring that the inner earth-discharge operation is not influenced, thereby realizing the safe and efficient construction of the underground reservoir of the open-pit coal mine. Finally, a surface water pipe 62 communicating with the underground water pipe 61 through a vertical pipe 63 is laid on the filled inner dumping 40. The effect diagram of the built open pit coal mine underground reservoir containing the core rock-fill retaining dam is shown in fig. 1 and 3.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (6)
1. An open pit coal mine underground reservoir containing a core wall rock-fill retaining dam structure, which is characterized in that: the system comprises an opencast coal mine pit used as a water storage space, core wall retaining dams arranged in the opencast coal mine pit, rock-fill arranged at the front side and the rear side of the core wall retaining dams and used as water storage bodies, and inner earth-discharge filled on the rock-fill and discharged by inner earth-discharge operation, wherein the core wall retaining dams comprise a plurality of parallel core wall retaining dams which are sequentially constructed according to the inner earth-discharge operation direction, the plurality of core wall retaining dams divide the opencast coal mine pit into a plurality of underground water storage spaces, each core wall retaining dam is constructed in multiple stages along with the inner earth-discharge operation, water conveying pipe networks are arranged among the plurality of underground water storage spaces to ensure water regulation and water taking among different libraries, and an impermeable layer paved by solid wastes is arranged at the bottom of the rock-fill;
The dam foundation depth of the first-stage core wall retaining dam of the core wall retaining dam is 10-15m, the slope angle of each stage core wall retaining dam is 87 degrees, the dam top width of the last-stage core wall retaining dam is 10-15m, the relation between the total height H n of the core wall retaining dam and the pit depth H of an open pit coal mine is H=H n +10m, and the relation between the maximum width W of the core wall retaining dam and the pit depth H of the open pit coal mine is W=20m+ (H-10 m)/tan 87 degrees;
The rock-fill is formed by inclined stacking of rubble, or material with space holes and/or cavity structures along the core wall retaining dam.
2. An open pit coal mine underground reservoir according to claim 1, wherein: the core wall retaining dam is formed by concrete casting or soil Dan Nianya.
3. An open pit coal mine underground reservoir according to claim 1, wherein: the filling height of the inner dumping on the rockfill is equal to the height of the core wall water retaining dam.
4. An open pit coal mine underground reservoir according to claim 1, wherein: the stacking gradient of the piled stones is 25-33 degrees.
5. An open pit coal mine underground reservoir according to claim 1, wherein: the thickness Hs of the impermeable layer is 1-1.5m.
6. An open pit coal mine underground reservoir according to claim 1, wherein: the water delivery pipe network comprises an underground water delivery pipe buried in the water storage body and an earth surface water delivery pipe which is arranged on the surface layer of the inner soil discharge and is communicated with the underground water delivery pipe through a vertical pipeline.
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| CN201810983622.9A CN109026152B (en) | 2018-08-27 | 2018-08-27 | Open pit coal mine underground reservoir containing core wall rock-fill retaining dam structure |
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| CN201810983622.9A CN109026152B (en) | 2018-08-27 | 2018-08-27 | Open pit coal mine underground reservoir containing core wall rock-fill retaining dam structure |
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| CN109026152B true CN109026152B (en) | 2024-04-19 |
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| CN110409360B (en) * | 2019-06-20 | 2021-01-15 | 中国矿业大学 | Pit bottom reservoir staged construction method based on intermediate bridge of inner-discharging strip mine |
| CN110409359B (en) * | 2019-06-20 | 2021-01-15 | 中国矿业大学 | Segmented construction method for bottom reservoir of inner-drainage open pit |
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| CN113106988B (en) * | 2021-04-14 | 2022-01-25 | 中国矿业大学 | Internal dam body construction method for refuse dump of internal-discharge strip mine |
| CN113622364B (en) * | 2021-07-27 | 2022-09-27 | 中国矿业大学 | Construction method suitable for strip mine underground reservoir with depth larger than 100m in water-poor area |
| CN113565172B (en) * | 2021-08-02 | 2022-04-15 | 中国矿业大学 | Construction method of pumping and water injecting well of underground reservoir of strip mine waste dump |
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