CN109057861B - Method for calculating underground reservoir, reservoir water storage body and reservoir capacity of open coal mine - Google Patents
Method for calculating underground reservoir, reservoir water storage body and reservoir capacity of open coal mine Download PDFInfo
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- CN109057861B CN109057861B CN201810985153.4A CN201810985153A CN109057861B CN 109057861 B CN109057861 B CN 109057861B CN 201810985153 A CN201810985153 A CN 201810985153A CN 109057861 B CN109057861 B CN 109057861B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 239000003245 coal Substances 0.000 title claims abstract description 108
- 238000003860 storage Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims description 6
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- 239000002689 soil Substances 0.000 claims description 15
- 239000004575 stone Substances 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000005065 mining Methods 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 8
- 238000010276 construction Methods 0.000 description 14
- 238000007599 discharging Methods 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
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- 238000000746 purification Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- 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
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
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Abstract
The invention provides an underground reservoir water storage body of an open pit coal mine, which is formed by sequentially and alternately stacking 2-6 rows of prefabricated culverts from the bottom of an underground reservoir, wherein stacking gaps among the prefabricated culverts are filled with gravels or rubbles, a plurality of rows of culvert holes are arranged on the prefabricated culverts, the number of each row of culvert holes is 4-8, the plurality of rows of culvert holes are uniformly arranged on the same circumference of the prefabricated culverts, central holes are arranged among each row of culvert holes, water is conveniently conducted among the prefabricated culverts, and culvert holes are not arranged on the outer walls of the prefabricated culverts positioned at the periphery boundary of the underground reservoir so as to ensure effective water storage of the underground reservoir. The invention also provides an underground reservoir of an opencast coal mine with the prefabricated pipe culvert as a water storage body and a calculation method of the storage capacity of the underground reservoir. The underground reservoir of the open pit coal mine, which uses the prefabricated pipe culvert as the water storage body, has large reservoir capacity, stable structure and convenient and accurate reservoir capacity calculation.
Description
Technical Field
The invention belongs to the technical field of intersection of mining engineering and hydraulic engineering, and particularly relates to an underground reservoir of an opencast coal mine, a reservoir water storage body and a reservoir capacity calculation method.
Background
The open pit coal mining faces the environmental problems of land desertification, underground and water pollution and the like, and the construction of the underground reservoir of the coal mine provides an engineering technical approach for clean treatment, effective storage and quality-division utilization of mine water. The built underground reservoir mainly aims at the construction of underground mining wells in China, the disclosed patent relates to the construction of the underground reservoir of the open pit coal mine, which mainly takes rubble or other porous media as water storage materials to fill and form a multi-layer storage space, the construction and the internal soil discharging operation are synchronously carried out, the spatial horizon features are distributed, the rubble or other porous media are taken as filter layers and water storage bodies in the underground reservoir, the construction is simple, the construction cost is low, but the reservoir has the defects of small storage capacity and unstable structure.
Disclosure of Invention
The invention aims to solve the technical problem of providing an open pit coal mine underground reservoir with large reservoir capacity and stable structure, a reservoir water storage body and a reservoir capacity calculating method.
In order to solve the technical problems, the invention provides an underground reservoir water storage body of an open pit coal mine, which comprises three layers of water storage bodies, wherein the water storage bodies are sequentially staggered from the bottom of the underground reservoir water storage body upwards, the water storage bodies are filled with earth discharging in the open pit coal mine and are stacked alternately by 2-6 rows of prefabricated culverts, stacking gaps between the prefabricated culverts are filled with broken stone, a plurality of rows of culvert holes are formed in the prefabricated culverts, the number of each row of culvert holes is 4-8, the water storage body is uniformly arranged on the same circumference of the prefabricated culverts, central holes are formed between every two rows of culvert holes, water is conveniently conducted between the prefabricated culverts, and the side walls of the prefabricated culverts positioned at the periphery of the open pit coal mine are not provided with culverts so as to ensure effective water storage of the underground reservoir.
Further, the inner diameter of the prefabricated culvert is 1.5-1.8m, the outer diameter is 1.9-2.2m, the wall thickness is 0.4-0.7m, the length of the prefabricated culvert is 40-60m, the distance between each row of culvert holes on the prefabricated culvert is 1.5-2.0m, and the aperture of the culvert holes is 16cm.
Further, the prefabricated pipe culvert is prepared by proportioning broken stone and medium coarse sand as aggregate and cement to form concrete, and prefabricating the concrete by using a first-class cold-drawn low-carbon steel spiral reinforcing steel bar as a reinforcing rib.
The invention provides an underground reservoir of an open coal mine, which comprises a water storage body and a core wall retaining dam; the core wall retaining dams are sequentially constructed in the direction of the stripping area of different underground reservoirs according to the position of the dumping site in the open pit coal mine and the boundary of the mining area; each underground reservoir is provided with the water storage body, the water storage body comprises three layers of water storage bodies, the water storage bodies are sequentially staggered from the bottom of the underground reservoir to the top, each layer of water storage bodies are formed by staggered stacking of 2-6 rows of prefabricated culverts, stacking gaps among the prefabricated culverts are filled with broken stones, the prefabricated culverts are provided with a plurality of rows of culvert holes, the number of each row of culvert holes is 4-8, the water storage bodies are uniformly arranged on the same circumference of the prefabricated culverts, a central hole is arranged between every two rows of culvert holes, water is conveniently conducted between the prefabricated culverts, and the side walls of the prefabricated culverts at the periphery of an opencast coal mine are not provided with culverts so as to ensure effective water storage of the underground reservoirs; and the water storage bodies and the surrounding parts are filled with the waste in the open pit coal mine to the same height as the core wall water retaining dam, and water conveying pipe networks are arranged between different underground water reservoirs, so that water can be conveniently transferred between different underground reservoirs.
Further, the core wall retaining dam is a concrete gravity dam or a soil and stone gravity dam, and is formed by pouring and rolling in stages, wherein the width of the dam top of the core wall retaining dam is 10-15m, the angle of a dam slope is 87 degrees, and the dam foundation H b Height H of dam body of 10-15m N The relation with pit depth H of an opencast coal mine is H=H N The relation between the maximum width W of the dam body and the pit depth H of the open pit coal mine is W=20m+ (H-10 m)/tan 87 degrees.
Further, a reservoir bottom impermeable layer is arranged at the reservoir bottom of the underground reservoir, and the reservoir bottom impermeable layer is formed by rolling and paving black slime stripped from the surface layer of an open pit coal mine.
The invention also provides a calculation method of the storage capacity of the underground reservoir of the open coal mine, which comprises the following steps:
collecting the dumping height D of a dumping site in an opencast coal mine m By the formula n=d m 2 x 3.8, calculating the distribution number N of the staggered underground reservoirs of the open coal mine;
collecting minimum width W of dumping site in open pit coal mine m By the formula N C ＝W m 2 x 1.9 calculating the number of prefabricated culverts N required for the water storage bodies of the single underground reservoir of the dump in the opencast coal mine C ；
The storage capacity of an underground reservoir of a dumping site in an open pit coal mine is sequentially recorded as V R1 、V R2 、…、V Rn Collecting lengths L of stacked prefabricated culverts in water storage bodies at different positions of a dumping site in an open pit coal mine Rn And then calculating the total reservoir capacity of the underground reservoir of the dumping site in the open pit coal mine by the following formula:
V R ＝V R1 +V R2 +…+V Rn ＝[π×(1.5/2) 2 ]×(L R1 +L R2 +…+L Rn )×N C ；
wherein N and N C Rounding to integer, n represents the number of underground water reservoir.
According to the underground reservoir of the open pit coal mine, according to the position of the dumping site in the open pit coal mine, the core wall retaining dams are built in the dumping site along the boundary of the stripping area, and the core wall retaining dams of different underground reservoirs are sequentially built towards the stripping area, so that the dumping operation in the open pit coal mine and the construction of the underground reservoir can be effectively combined. In addition, the prefabricated culverts are used as the water storage bodies of the underground reservoirs of the open pit coal mine, the water storage bodies are formed by stacking the plurality of layers of prefabricated culverts, the stacking gaps between the prefabricated culverts are filled with broken stones to achieve the hierarchical purification effect on water quality, the prefabricated culverts arranged in a staggered mode can ensure the stability of the structure of the water storage bodies, and the water delivery pipes arranged between the underground reservoirs have the function of conveniently regulating water among the underground reservoirs, so that the underground reservoirs of the open pit coal mine have the advantages of large storage capacity, simplicity in construction and stable structure, and safe and efficient construction of the underground reservoirs of the open pit coal mine is realized. Meanwhile, the prefabricated pipe culverts are adopted as the water storage bodies of the underground reservoirs of the open-pit coal mine, and the distribution number of the underground reservoirs of the open-pit coal mine and the number of the prefabricated pipe culverts in the water storage bodies required by a single reservoir can be conveniently calculated by collecting the soil discharging height of the soil discharging field in the open-pit coal mine, the minimum width of the soil discharging field and the lengths of the prefabricated pipe culverts stacked in the water storage bodies at different positions of the soil discharging field in the open-pit coal mine, so that the total storage capacity of the underground reservoirs of the soil discharging field in the open-pit coal mine can be finally calculated, and the calculation of the storage capacity of the reservoirs is more convenient and accurate.
Drawings
FIG. 1 is a cross-sectional view of an underground reservoir body of an open pit coal mine provided by an embodiment of the invention;
fig. 2 is a plan view of a prefabricated culvert of a storage body of an underground reservoir of an open pit coal mine according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a partially preformed pipe culvert stack of an opencast coal mine underground reservoir body according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an underground reservoir construction layout structure of an open pit coal mine according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a core wall retaining dam structure of an underground reservoir of an opencast coal mine according to an embodiment of the present invention;
fig. 6 is a plan view of a water storage body of an underground reservoir of an opencast coal mine according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the present invention provides an underground reservoir water storage body of an opencast coal mine, where a water storage body 10 includes three layers of water storage bodies, and taking a water storage body 10 in a first underground reservoir as an example, the three layers of water storage bodies include 1-R1, 1-R2 and 1-R3, the three layers of water storage bodies are sequentially staggered from the bottom of the opencast coal mine upwards at a certain distance, and the space between the three layers of water storage bodies and the periphery of each layer of water storage body are filled with an in-opencast coal mine dumping 50.
Referring to fig. 2 and 3, each layer of water storage bodies 10 is formed by stacking 2-6 rows of prefabricated pipe culverts 20 in a staggered manner from bottom to top. In order to make stacking between the prefabricated culverts 20 stronger, the contact portions of the prefabricated culverts 20 are bonded together by using an adhesive, for example, different prefabricated culverts 20 can be spliced together by adopting mortar pouring. The stacking gap formed by stacking three prefabricated pipe culverts 20 together is filled with gravels 30 such as gravels or rubbles. The number of the culvert holes 21 in each row is 4-8, the aperture of each culvert hole 21 is 16cm, and each row of culvert holes 21 is uniformly arranged on the same circumference of the prefabricated culvert 20, as a specific embodiment of the invention, the number of the culvert holes 21 in each row of the prefabricated culvert 20 is 6, and the culvert holes 21 are uniformly arranged on the same circumference of the prefabricated culvert 20 along the outer wall of the prefabricated culvert 20 at 60 degrees with radial included angles. The interval between every two rows of culvert holes 21 on each prefabricated culvert 20 is 1.5-2.0m, a central hole 22 is arranged in the middle position between every two rows of culvert holes 21, and the aperture of the central hole 22 is also 16cm, so that water is conveniently guided between the prefabricated culverts 20. In addition, in order to ensure effective water storage of the underground reservoir, the side wall of the prefabricated pipe culvert 20 positioned at the peripheral boundary of the open pit coal mine is not provided with culvert holes 21, so that water in the water storage body 10 is prevented from seeping out to the periphery of the underground reservoir. Wherein, the prefabricated pipe culvert 20 is prefabricated by taking coarse aggregates such as broken stone and fine aggregates such as medium coarse sand as aggregates, then adding water to mix with cement to form concrete, and then taking spiral first-class cold-drawn low-carbon steel bars as reinforcing ribs. The prefabricated culvert 20 has an inner diameter of 1.5-1.8m, an outer diameter of 1.9-2.2m, and a wall thickness of 0.4-0.7m, and the length of the prefabricated culvert 20 is generally designed to be 40-60m according to the different lengths of the inner dumping sites of the opencast coal mine used for constructing the underground reservoir.
Referring to fig. 4, the present invention provides an underground reservoir for an open pit coal mine, comprising a water storage body 10, and a core wall dam 40. The core wall retaining dams 40 are arranged at the boundary positions of the compliant stripping areas of the dumping sites in the open pit coal mine, and the core wall retaining dams 40 of different underground reservoirs are sequentially constructed towards the stripping areas. The water storage body 10 comprises three layers of water storage bodies, taking the water storage body 10 in the first underground reservoir as an example, namely, the three layers of water storage bodies comprising 1-R1, 1-R2 and 1-R3, wherein the three layers of water storage bodies are sequentially staggered from the bottom of the open pit coal mine upwards at a certain distance, and the soil discharge 50 in the open pit coal mine is filled between the three layers of water storage bodies and around each layer of water storage body. Each layer of water storage body is formed by stacking 2-6 rows of prefabricated pipe culverts 20 in a staggered manner from bottom to top. In order to make stacking between the prefabricated culverts 20 stronger, the contact portions of the prefabricated culverts 20 are bonded together by using an adhesive. The stacking gap formed by stacking three prefabricated pipe culverts 20 together is filled with gravels 30 such as gravels or rubbles. The prefabricated culvert 20 of every is last to set up multirow culvert hole 21, and the number of hole 21 is 4-8 to the every row culvert, and the aperture of hole 21 is 16cm to every row culvert hole 21 evenly sets up on prefabricated culvert 20 same circumference. The distance between every two rows of culvert holes 21 on each prefabricated culvert 20 is 1.5-2.0m, a central hole 22 is arranged in the middle between every two rows of culvert holes 21, and the aperture of the central hole 22 is also 16cm, so that water is conveniently guided between the prefabricated culverts 20. In addition, in order to ensure effective water storage of the underground reservoir, the side wall of the prefabricated pipe culvert 20 positioned at the peripheral boundary of the open pit coal mine is not provided with culvert holes 21, so that water in the water storage body 10 is prevented from seeping out to the periphery of the underground reservoir. The height of the uppermost water storage body of the three-layer water storage body 10 is equal to the height of the core wall retaining dam 40 of the underground reservoir. As a specific embodiment of the present invention, the three water storage bodies of each underground reservoir 10 are sequentially staggered from the pit bottom to the top, and the staggered height between the water storage bodies 10 of each layer is designed to be 3.8m, namely, the height of stacking two layers of prefabricated pipe culverts 20 is about. The inner dumping 50 such as sandy lime soil, loess, black clay and the like stripped from the surface layer of the open pit coal mine is sequentially filled from the bottom of the reservoir to the surface to be level with the height of the core wall retaining dam 40 between each layer of water storage bodies 10 and around each layer of water storage bodies 10, so that the coordination problem between the inner dumping transfer operation of the open pit coal mine and the construction and construction of the underground reservoir is solved. In addition, the water storage bodies 10 of different layers of each underground reservoir are communicated through a water pipe 60. And the water delivery pipes communicated with each other are also arranged among different underground reservoirs to form a water delivery pipe network, so that water can be taken and regulated among different underground reservoirs conveniently.
Referring to fig. 5, the core wall retaining dams 40 are concrete gravity dams or earth-rock gravity dams, which are formed by casting and rolling in stages, wherein the width of the tops of the core wall rock-fill retaining dams 40 is 10-15m, the angle of the slopes of the core wall retaining dams is 87 degrees, in order to make the core wall retaining dams more firm and stable, the core wall rock-fill retaining dams 40 of each underground reservoir are provided with a dam foundation, and the dam foundation H b Designed to be 10-15m, the height H of the dam body N H=h in relation to pit depth H of open pit coal mine N +10m is designed, and the relation between the maximum width W of the dam body and the pit depth H of the open pit coal mine is designed according to the formula W=20m+ (H-10 m)/tan 87 degrees.
In order to prevent underground water at the bottom of the underground reservoir from penetrating into the stratum, a reservoir bottom impermeable layer 70 is further arranged at the bottom of the underground reservoir, and the reservoir bottom impermeable layer 70 is formed by rolling and paving inner dumping such as black clay stripped from the surface layer of an open pit coal mine, so that the coordination problem between the inner dumping transfer operation of the open pit coal mine and the construction and construction of the underground reservoir is further solved.
The invention also provides a calculation method of the storage capacity of the underground reservoir of the open coal mine, which comprises the following steps:
collecting the dumping height D of a dumping site in an opencast coal mine m By the formula n=d m And (2) calculating the distribution number N of the staggered underground reservoirs of the open pit coal mine.
Collecting minimum width W of dumping site in open pit coal mine m By the formula N C ＝W m 2 x 1.9 calculating the number of prefabricated culverts N required for the water storage bodies of the single underground reservoir of the dump in the opencast coal mine C 。
The storage capacity of an underground reservoir of a dumping site in an open pit coal mine is sequentially recorded as V R1 、V R2 、…、V Rn Collecting the storage at different positions of the dumping site in the open pit coal mineLength L of stacked prefabricated culverts in water Rn And then calculating the total reservoir capacity of the underground reservoir of the dumping site in the open pit coal mine by the following formula:
V R ＝V R1 +V R2 +…+V Rn ＝[π×(1.5/2) 2 ]×(L R1 +L R2 +…+L Rn )×N C ；
wherein N is rounded to an integer, N C Rounding to integer, n represents the number of underground water reservoir.
Referring to fig. 1 and 6, a method for calculating the storage capacity of an underground reservoir using a prefabricated culvert as a water storage body will now be specifically described by way of example. The underground reservoir of the open pit coal mine is designed and built in an open pit coal mine internal dumping site (hereinafter simply referred to as the open pit coal mine internal dumping site 1) with the number of 1, and a plurality of underground reservoirs are built in the open pit coal mine internal dumping site 1 according to the area of the open pit coal mine internal dumping site 1. The method for determining the storage capacity of the underground reservoir of the opencast coal mine comprises the following steps:
step (1): collecting the dumping height D of a dumping site 1 in an opencast coal mine m Calculating the distribution number of the staggered underground reservoirs of the open coal mine through the following formula:
N＝D m 2 x 3.8 (N is rounded)
Step (2): collecting the minimum width W of the dumping site 1 in the open pit coal mine m Then, the required pipe function number of the single reservoir of the dumping site 1 in the open pit coal mine is calculated by the following formula:
N C ＝W m /2*1.9(N C rounding and rounding
Step (3): the storage capacity of an underground reservoir of the dumping site 1 in the open pit coal mine is sequentially recorded as V 1-R1 、V 1-R2 、…、V 1-Rn (1 represents the number of the internal dumping site and n represents the number of the underground water reservoir), and the lengths L of prefabricated pipe culverts stacked at different positions of the internal dumping site 1 in the opencast coal mine are collected 1-Rn And then calculating the total reservoir capacity of the underground reservoir in the dumping site 1 in the open pit coal mine by the following formula:
V 1-R ＝V 1-R1 +V 1-R2 +…+V 1-Rn ＝[π×(1.5/2) 2 ]×(L 1-R1 +L 1-R2 +…+L 1-Rn )×N C
according to the calculation method for the storage capacity of the underground reservoir of the open pit coal mine, disclosed by the invention, the distribution number of the underground reservoir of the open pit coal mine and the number of the prefabricated pipe culverts in the water storage bodies required by a single reservoir can be conveniently calculated by collecting the soil discharging height of the soil discharging field in the open pit coal mine, the minimum width of the soil discharging field and the lengths of the prefabricated pipe culverts stacked in the water storage bodies at different positions of the soil discharging field in the open pit coal mine, so that the total storage capacity of the underground reservoir of the soil discharging field in the open pit coal mine can be finally calculated, and the calculation of the storage capacity of the reservoir is more convenient and accurate.
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 (7)
1. An open coal mine underground reservoir water storage body which is characterized in that: the water storage body comprises three layers of water storage bodies, the water storage bodies are sequentially staggered from the bottom of an underground reservoir, the water storage bodies are filled with soil discharged from an opencast coal mine, each layer of water storage bodies are formed by staggered stacking 2-6 rows of prefabricated culverts, stacking gaps between the prefabricated culverts are filled with broken stones, a plurality of rows of culvert holes are formed in the prefabricated culverts, the number of each row of culvert holes is 4-8, the water storage bodies are uniformly arranged on the same circumference of the prefabricated culverts, central holes are formed between every two rows of culvert holes, water is conveniently conducted between the prefabricated culverts, and the culvert holes are not formed in the side walls of the prefabricated culverts at the periphery of the opencast coal mine so as to ensure effective water storage of the underground reservoir.
2. An open pit coal mine underground reservoir water storage body as claimed in claim 1, wherein: the inner diameter of the prefabricated culvert is 1.5-1.8m, the outer diameter of the prefabricated culvert is 1.9-2.2m, the wall thickness of the prefabricated culvert is 0.4-0.7m, the length of the prefabricated culvert is 40-60m, the distance between each row of culvert holes on the prefabricated culvert is 1.5-2.0m, and the aperture of the culvert holes is 16cm.
3. An open pit coal mine underground reservoir water storage body as claimed in claim 1, wherein: the prefabricated pipe culvert is prepared by proportioning broken stone and medium coarse sand as aggregate and cement to form concrete, and prefabricating a first-class cold-drawn low-carbon steel spiral reinforcing bar as a reinforcing rib.
4. An open coal mine underground reservoir, which is characterized in that: a water storage body comprising any one of claims 1 to 3, and a core dam; the core wall retaining dams are sequentially constructed in the direction of the stripping area of different underground reservoirs according to the position of the dumping site in the open pit coal mine and the boundary of the mining area; each underground reservoir is provided with the water storage body, the water storage body comprises three layers of water storage bodies, the water storage bodies are sequentially staggered from the bottom of the underground reservoir to the top, each layer of water storage bodies are formed by staggered stacking of 2-6 rows of prefabricated culverts, stacking gaps among the prefabricated culverts are filled with broken stones, the prefabricated culverts are provided with a plurality of rows of culvert holes, the number of each row of culvert holes is 4-8, the water storage bodies are uniformly arranged on the same circumference of the prefabricated culverts, a central hole is arranged between every two rows of culvert holes, water is conveniently conducted between the prefabricated culverts, and the side walls of the prefabricated culverts at the periphery of an opencast coal mine are not provided with culverts so as to ensure effective water storage of the underground reservoirs; and the water storage bodies and the surrounding parts are filled with the waste in the open pit coal mine to the same height as the core wall water retaining dam, and water conveying pipe networks are arranged between different underground water reservoirs, so that water can be conveniently transferred between different underground reservoirs.
5. An open pit coal mine underground reservoir according to claim 4, wherein: the core wall retaining dam is formed by pouring and rolling concrete gravity dams or earth-rock gravity dams in stages, the width of the dam top of the core wall retaining dam is 10-15m, the dam slope angle is 87 degrees, and the vertical distance H between the bottom edge of the core wall retaining dam and the bottom edge of the reservoir bottom anti-seepage pavement is between the bottom edge of the core wall retaining dam and the bottom edge of the reservoir bottom anti-seepage pavement b Height H of dam body of 10-15m N The relation with pit depth H of an opencast coal mine is H=H N +10m, maximum dam bodyThe relation of the width W and the pit depth H of the open pit coal mine is W=20m+ (H-10 m)/tan 87 degrees.
6. An open pit coal mine underground reservoir according to claim 4, wherein: the underground reservoir bottom is provided with a bottom impermeable layer, and the bottom impermeable layer is formed by rolling and paving black slime stripped from the surface layer of an open pit coal mine.
7. A method of calculating the reservoir capacity of an underground reservoir of an opencast coal mine as claimed in any one of claims 4 to 6, comprising the steps of:
collecting the dumping height D of a dumping site in an opencast coal mine m By the formula n=d m 2 x 3.8, calculating the distribution number N of the staggered underground reservoirs of the open coal mine;
collecting minimum width W of dumping site in open pit coal mine m By the formula N C =W m 2 x 1.9 calculating the number N of prefabricated culverts of the water storage bodies required by a single underground reservoir of the dumping site in the open pit C ；
The storage capacity of an underground reservoir of a dumping site in an open pit coal mine is sequentially recorded as V R1 、V R2 、…、V Rn Collecting lengths L of stacked prefabricated culverts in water storage bodies at different positions of a dumping site in an open pit coal mine Rn And then calculating the total reservoir capacity of the underground reservoir of the dumping site in the open pit coal mine by the following formula:
V R = V R1 + V R2 + … + V Rn =[π×(1.5/2) 2 ]×(L R1 + L R2 +…+ L Rn )×N C ；
wherein N and N C Rounding to integer, n represents the number of underground water reservoir.
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| CN110298473A (en) * | 2019-04-17 | 2019-10-01 | 中国水利水电科学研究院 | A kind of method of overmining region groundwater reservoir addressing and determining storage capacity of regulating and storing |
| 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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