A method of constructing an above-ground water storage area and a water storage system
By constructing a stable above-ground water storage area in the coal mining subsidence area, utilizing the gully area exposed by the rock wall and connecting pipelines, and combining layers of gravel, geotextile and sand, the problems of large engineering volume and high cost of underground reservoirs in existing technologies have been solved, and the stability and ecological effects of the reservoir have been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-03-10
- Publication Date
- 2026-03-31
AI Technical Summary
Existing technologies for constructing underground reservoirs suffer from problems such as large engineering workload, high cost, unstable reservoir structure, and water leakage, especially in coal mining subsidence areas where large amounts of water seepage and evaporation lead to the drying up of the water storage area.
In coal mining subsidence areas, stable zones are selected as water storage areas. The gullies with exposed rock walls are used as sidewall dams. The underground reservoir is connected to the water storage area through connecting pipes, and connecting pipes are installed in the cracks of the sidewalls. Combined with the laying of gravel, geotextile and sand layers, a stable above-ground water storage area is formed.
By effectively utilizing the natural topography, reducing material usage and environmental pollution, and lowering costs, the reservoir has achieved stability and effective water storage, thus promoting ecological restoration.
Smart Images
Figure CN116770931B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of underground reservoir construction technology in coal mining, and in particular to a method and system for constructing an aboveground water storage area of an underground reservoir. Background Technology
[0002] Underground mining has created large-scale coal mining subsidence areas in western my country. After mining stabilized, combined with the characteristics of typical loess landforms, intense surface runoff erosion has resulted in a fragmented, gully-ridden landscape. The area suffers from uneven water and heat distribution: high accumulated temperature and low rainfall during the growing season, and low accumulated temperature and high rainfall in the later stages of plant growth. Due to factors such as water infiltration from fissures left in the mining areas within the gullies and high evaporation leading to the drying up of water storage areas, the gully areas often cannot retain water.
[0003] In existing technologies, impermeable concrete is laid and compacted on the sidewalls and bottom of the reservoir, followed by the laying of geomembrane, normal concrete, another geomembrane, and black clay to form an underground reservoir with impermeable functions. This method uses a large amount of concrete and geomembrane to construct the impermeable facilities at the bottom and sidewalls of the reservoir, resulting in a large engineering workload and high costs. Another method utilizes sloping roads to collect rainwater, allowing it to flow into the reservoir. One side of the reservoir is the dam body, and the other side is rock mass, forming a sunken stepped reservoir that utilizes the terrain. This method uses the slope as a single-sided dam body, which can easily lead to dangers when storing water at higher levels, and the upstream and downstream flow pipes are easily blocked by silt and other debris from the upper reservoir. Summary of the Invention
[0004] In view of this, the purpose of this application is to provide a method for constructing an above-ground water storage area of an underground reservoir, which can effectively solve the above-mentioned technical problems.
[0005] In a first aspect, embodiments of this application provide a method for constructing an aboveground water storage area of an underground reservoir, including site selection and pipeline installation; selecting a coal mining subsidence area with a containment space above ground as the water storage area in an area with an underground reservoir; and installing a connecting pipe to connect the underground reservoir and the containment space for introducing water from the underground reservoir into the water storage area.
[0006] In an optional embodiment according to the first aspect, the coal mining subsidence area is a stable zone, which satisfies the following formula: T ≥ 3h; where T is the time interval after coal mining in days; and h is the depth of coal mining in meters. It should be noted that the coal mining subsidence area is a stable zone, which satisfies the following formula: T ≥ 3h; where T is the time interval after coal mining in days; and h is the depth of coal mining in meters. The stable zone is defined by the applicant through experiments. For example, if the coal mining depth is 100m, then after at least 300 days after coal mining, the area is considered a stable zone. Using a stable zone ensures the stability of the water storage area structure.
[0007] In an optional embodiment according to the first aspect, the coal mining subsidence area is selected as a gully area with exposed rock walls on both sides as the sidewall dam body of the water storage area. It should be noted that selecting a gully area with exposed rock walls on both sides as the sidewall dam body of the water storage area ensures full utilization of the gully area's own geomorphic advantages, thereby effectively utilizing the surrounding environment to establish the water storage area.
[0008] In an optional embodiment according to the first aspect, the site selection step further includes a sidewall dam crack sealing step: sealing the sidewall dam cracks by pouring concrete. It should be noted that the site selection step further includes a sidewall dam crack sealing step: sealing the sidewall dam cracks by pouring concrete. This can effectively improve the original environment, thereby ensuring the stability of the water storage area structure and preventing water loss along the cracks.
[0009] In an optional embodiment according to the first aspect, the site selection step further includes a bottom compaction step for the water storage area: leveling the bottom of the water storage area, laying crushed stone, and compacting it to form a foundation. It should be noted that the site selection step further includes a bottom compaction step for the water storage area: leveling the bottom of the water storage area, laying crushed stone, and compacting it to form a foundation. This further ensures the stability of the bottom of the water storage area.
[0010] In an optional embodiment according to the first aspect, the site selection step further includes a geotextile laying step: laying geotextile on the foundation. It should be noted that the site selection step further includes a geotextile laying step: laying geotextile on the foundation to prevent moisture penetration.
[0011] In an optional embodiment according to the first aspect, the site selection step further includes a sand covering step: covering the geotextile with sand. It should be noted that the site selection step further includes a sand covering step: covering the geotextile with sand.
[0012] In an optional embodiment according to the first aspect, in the step of sealing the cracks in the sidewall dam body: a portion of the crack used for installing the connecting pipe is preserved, thus avoiding concrete pouring; in the step of installing the pipe, the connecting pipe is installed in the preserved cracks in the sidewall dam body, connecting the underground reservoir and the water storage area, wherein a water inlet valve is provided on the connecting pipe. It should be noted that in the step of sealing the cracks in the sidewall dam body: a portion of the crack used for installing the connecting pipe is preserved, thus avoiding concrete pouring; in the step of installing the pipe, the connecting pipe is installed in the preserved cracks in the sidewall dam body, connecting the underground reservoir and the water storage area, wherein a water inlet valve is provided on the connecting pipe. The cracks in the sidewall dam body can be fully utilized, thus eliminating the need for a separate pipe for installing the connecting pipe. The water inlet valve on the connecting pipe allows for the control of water injection into the water storage area through the connecting pipe at appropriate time intervals.
[0013] Secondly, this application also provides a water storage system, which includes an underground reservoir, a water storage area, and a connecting pipe connecting the underground reservoir and the water storage area. The connecting pipe is used to introduce water from the underground reservoir into the water storage area. The water storage area is a coal mining subsidence area with a capacity, and the underground reservoir is adjacent to the coal mining subsidence area.
[0014] In an optional embodiment according to the first aspect, the bottom of the water storage area is sequentially covered with a layer of crushed stone, a layer of geotextile, and a layer of sand. It should be noted that sequentially laying these layers at the bottom of the water storage area effectively ensures the stability of the water storage area structure, thereby preventing water infiltration.
[0015] The method for constructing an aboveground water storage area of an underground reservoir provided in this application has at least the following advantages compared with the prior art:
[0016] The method for constructing an aboveground water storage area of an underground reservoir provided in this application includes site selection and pipeline installation; selecting a coal mining subsidence area with sufficient aboveground space as the water storage area within an area with an underground reservoir; and installing connecting pipes to connect the underground reservoir and the aboveground space to introduce water from the underground reservoir into the water storage area. This application fully utilizes the loess gully topography of the coal mining subsidence area to construct a reservoir in the gully area, which can effectively purify the water diverted from the underground reservoir, effectively collect rainfall, and use the stored water for vegetation maintenance and irrigation during drought periods, promoting the ecological restoration of the damaged area. This application utilizes the exposed sidewalls of the rock mass in the coal mining subsidence area and the loess gully area to construct the reservoir; combined with the water output from the underground reservoir, the purified water is stored on the surface for further purification and ecological utilization; this application utilizes the rock fissures in the coal mining subsidence area as connecting pipes between the aboveground water storage area and the underground reservoir; this application utilizes the natural topography, reduces material usage and environmental pollution, saves costs, and has a strong ecological effect.
[0017] The water storage system provided in this application utilizes the exposed sidewalls of rock masses in coal mining subsidence areas and loess gully areas to construct a reservoir; combined with the water output from the underground reservoir, the purified water is stored on the surface for further purification and ecological utilization; this application utilizes rock fissures in the coal mining subsidence area as a connecting pipeline between the above-ground water storage area and the underground reservoir; this application utilizes the natural topography, reduces material usage and environmental pollution, saves costs, and has a strong ecological effect. Attached Figure Description
[0018] The present application will be described in more detail below based on embodiments and with reference to the accompanying drawings.
[0019] Figure 1 This is a flowchart illustrating the method for constructing an aboveground water storage area of an underground reservoir according to an embodiment of this application;
[0020] Figure 2 This is a schematic diagram of the overall structure of the water storage system according to an embodiment of this application.
[0021] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.
[0022] Figure label:
[0023] 10-Water storage system; 11-Underground reservoir; 13-Water storage area; 131-Gravel layer; 133-Geotextile layer; 135-Sand layer; 137-Side wall; 15-Connecting pipe; 151-Water intake valve. Detailed Implementation
[0024] The present application will be further described below with reference to specific embodiments. It should be understood that these specific embodiments are for illustrative purposes only and are not intended to limit the scope of the present application.
[0025] For the sake of brevity, this article only discloses a few specific numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.
[0026] In the description of this article, it should be noted that, unless otherwise stated, "above" and "below" include the number itself, and "several" in "one or more" means two or more.
[0027] Unless otherwise stated, the terms used in this application have their common meanings as commonly understood by those skilled in the art. Unless otherwise stated, the values of the parameters mentioned in this application can be measured using various measurement methods commonly used in the art (e.g., they can be tested according to the methods given in the embodiments of this application).
[0028] Please refer to Figure 1 and combined Figure 2 The method for constructing an underground reservoir 11 and an above-ground water storage area 13 according to this application includes: site selection: selecting a coal mining subsidence area with a storage space on the ground in the area with the underground reservoir 11 as the water storage area 13; and pipeline installation: installing a connecting pipe 15 to connect the underground reservoir 11 and the storage space, for introducing water from the underground reservoir 11 into the water storage area 13.
[0029] The method for constructing an underground reservoir 11 and an above-ground water storage area 13 provided in this application includes site selection and pipeline installation; selecting a coal mining subsidence area with sufficient above-ground space as the water storage area 13 within an area containing the underground reservoir 11; and installing a connecting pipe 15 to connect the underground reservoir 11 and the space, for introducing water from the underground reservoir 11 into the water storage area 13. This application fully utilizes the loess gully landform of the coal mining subsidence area to establish a gully reservoir, which can effectively purify the water diverted from the underground reservoir 11, effectively collect rainfall, and use the stored water for vegetation maintenance and irrigation during drought periods, promoting the ecological restoration of the damaged area. This application utilizes the exposed sidewalls 137 of the rock mass in coal mining subsidence areas and loess gully areas to construct a reservoir; combined with the water output from the underground reservoir 11, the purified water from the underground reservoir 11 is stored on the surface for further purification and ecological utilization; this application utilizes the rock mass fissures in the coal mining subsidence area as a connecting pipe 15 between the above-ground water storage area 13 and the underground reservoir 11; this application utilizes the natural landform, reduces material usage and environmental pollution, saves costs, and has a strong ecological effect.
[0030] In an optional exemplary embodiment, the coal mining subsidence area is a stable zone, which satisfies the following formula: T ≥ 3h; where T is the time interval after coal mining in days; and h is the depth of coal mining in meters. It should be noted that the coal mining subsidence area is a stable zone, which satisfies the following formula: T ≥ 3h; where T is the time interval after coal mining in days; and h is the depth of coal mining in meters. The stable zone is defined by the applicant through experiments. For example, if the coal mining depth is 100m, then after at least 300 days after coal mining, the area is considered a stable zone. Using a stable zone ensures the stability of the water storage area 13 structure.
[0031] In an optional exemplary embodiment, the coal mining subsidence area is selected as a gully region with exposed rock walls on both sides as the sidewall 137 dam body of the water storage area 13. It should be noted that selecting a gully region with exposed rock walls on both sides as the sidewall 137 dam body of the water storage area 13 ensures full utilization of the geomorphic advantages formed by the gully region itself, thereby effectively utilizing the surrounding environment to establish the water storage area 13.
[0032] In an optional exemplary embodiment, the site selection step further includes a crack sealing step for the sidewall 137 dam body: the cracks in the sidewall 137 dam body are sealed by pouring concrete. It should be noted that the site selection step further includes a crack sealing step for the sidewall 137 dam body: the cracks in the sidewall 137 dam body are sealed by pouring concrete. This can effectively improve the original environment, thereby ensuring the stability of the water storage area 13 structure and preventing water loss along the cracks.
[0033] In an optional exemplary embodiment, the site selection step further includes a bottom compaction step for the water storage area 13: leveling the bottom of the water storage area 13, laying crushed stone, and compacting it to form a foundation. It should be noted that the site selection step further includes a bottom compaction step for the water storage area 13: leveling the bottom of the water storage area 13, laying crushed stone, and compacting it to form a foundation. This further ensures the stability of the bottom of the water storage area 13.
[0034] Specifically, in an optional exemplary embodiment, the soil at the bottom of the ditch is leveled, gravel with a diameter of less than 5 cm is laid, a 15 cm thick layer is laid, compacted, and concrete is poured to ensure the stability of the foundation.
[0035] In an optional exemplary embodiment, the site selection step further includes a geotextile laying step: laying geotextile on the foundation. It should be noted that the site selection step further includes a geotextile laying step: laying geotextile on the foundation to prevent moisture penetration.
[0036] Specifically, in this embodiment, 5-10 layers of geotextile are laid, with a total thickness of 1mm, and the material is a PE geomembrane. Its seepage prevention effect lasts for 25-30 years. The standard name for the geomembrane is polyethylene geomembrane, mainly made of a milky white, semi-transparent to opaque thermoplastic resin material—polyethylene resin. Polyethylene is a high-molecular polymer, a non-toxic, odorless, and tasteless white granule with a melting point of approximately 110℃-130℃ and a relative density of 0.918-0.965. The geomembrane has good heat and cold resistance, good chemical stability, high rigidity and toughness, good mechanical strength, and good resistance to environmental stress cracking and tear strength. As the density increases, the mechanical properties and barrier properties will correspondingly improve, and the heat resistance and tensile strength will also be higher; it can resist corrosion from acids, alkalis, organic solvents, etc. The geomembrane is a seepage prevention material composed of a PE membrane as the base material and geotextile, and its seepage prevention performance mainly depends on the PE membrane.
[0037] In an optional exemplary embodiment, the site selection step further includes a sand covering step: covering the geotextile with sand. Specifically, in this embodiment, 1m thick eroded soil (sandy soil) from the local erosion zone is laid on top of the geotextile and compacted.
[0038] In an optional exemplary embodiment, during the step of sealing the crack in the sidewall 137 dam body: a portion of the crack used for installing the connecting pipe 15 is preserved, thus avoiding concrete pouring; during the pipe installation step, the connecting pipe 15 is installed in the preserved crack in the sidewall 137 dam body, connecting the underground reservoir 11 and the water storage area 13, wherein a water inlet valve 151 is provided on the connecting pipe 15. It should be noted that during the step of sealing the crack in the sidewall 137 dam body: a portion of the crack used for installing the connecting pipe 15 is preserved, thus avoiding concrete pouring; during the pipe installation step, the connecting pipe 15 is installed in the preserved crack in the sidewall 137 dam body, connecting the underground reservoir 11 and the water storage area 13, wherein a water inlet valve 151 is provided on the connecting pipe 15. The crack in the sidewall 137 dam body can be fully utilized, thus eliminating the need for a separate pipe for installing the connecting pipe 15. The connecting pipe 15 is equipped with a water inlet valve 151, which can be used to control the injection of water into the water storage area 13 through the connecting pipe 15 at appropriate time intervals.
[0039] It should be noted that the exposed rock wall cracks in the gully area serve as the water intake for underground reservoir 11. The diameter of the connecting pipe 15 is 60cm, and the remaining space is filled with concrete. It is understood that the specific dimensions of the connecting pipe 15 are not limited here; in other specific embodiments, appropriate values can be set according to the user's actual needs. Specifically, the connecting pipe 15 is made of stainless steel with an inner plastic coating, and its length is 150-200 meters, determined according to the location of underground reservoir 11.
[0040] It should be noted that this application also includes the installation of pumping devices and regulating valves for replenishing the surface water storage area 13 with water from the underground reservoir 11 during the dry season.
[0041] It should also be noted that in this application, all the concrete used in the pouring was triethanolamine, which gave it good impermeability.
[0042] This application also provides a water storage system 10, which includes an underground reservoir 11, a water storage area 13, and a connecting pipe 15 connecting the underground reservoir 11 and the water storage area 13. The connecting pipe 15 is used to introduce water from the underground reservoir 11 into the water storage area 13. The water storage area 13 is a coal mining subsidence area with a storage capacity, and the underground reservoir 11 is adjacent to the coal mining subsidence area. This application utilizes the exposed sidewalls 137 of the rock mass in the coal mining subsidence area and loess gully area to construct the reservoir. Combined with the water output from the underground reservoir 11, the purified water from the underground reservoir 11 is stored on the surface for further purification and ecological utilization. This application utilizes rock fissures in the coal mining subsidence area as the connecting pipe 15 between the above-ground water storage area 13 and the underground reservoir 11. This application utilizes the natural topography, reduces material usage and environmental pollution, saves costs, and has a strong ecological effect.
[0043] In an optional exemplary embodiment, the bottom of the water storage area 13 is sequentially covered with a gravel layer 131, a geotextile layer 133, and a sand layer 135. It should be noted that the sequential laying of the gravel layer 131, geotextile layer 133, and sand layer 135 at the bottom of the water storage area 13 effectively ensures the stability of the structure of the water storage area 13, thereby preventing water infiltration.
[0044] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A method of constructing an above ground storage area for an underground water reservoir, characterized by, The application relates to a water storage system. Site selection: selecting a coal mining subsidence area with a containing space as a water storage area in a region with an underground reservoir; Pipe installation: installing a connecting pipe to connect the underground reservoir and the containing space, so as to introduce water in the underground reservoir into the water storage area; The coal mining subsidence area selects a gully area with exposed rock walls on both sides as a side wall dam body of the water storage area; In the site selection step, a side wall dam body crack sealing step is further included: pouring concrete into cracks of the side wall dam body to seal the cracks; In the side wall dam body crack sealing step: some cracks for installing the connecting pipe are reserved and are not poured with concrete; in the pipe installation step, the connecting pipe is installed in the reserved side wall dam body cracks and is connected to the underground reservoir and the water storage area, and a water inlet valve is arranged on the connecting pipe.
2. The method of constructing an above ground reservoir for an underground water reservoir as claimed in claim 1 wherein, The coal mining subsidence area is a stable area, and the stable area satisfies the following formula: T >= 3h; Wherein, T is the interval time after coal mining, and h is the depth of coal mining.
3. The method of constructing an above ground reservoir for an underground water reservoir as claimed in claim 1, wherein, In the site selection step, a water storage area bottom compaction step is further included: flattening the bottom of the water storage area, laying broken stones and compacting to form a foundation.
4. The method of constructing an above ground reservoir for an underground water reservoir as claimed in claim 3 wherein, In the site selection step, a geotextile laying step is further included: laying geotextile on the foundation.
5. The method of constructing an above ground reservoir for an underground water reservoir as claimed in claim 4 wherein, In the site selection step, a sand soil covering step is further included: covering sand soil on the laid geotextile.
6. A water storage system constructed by the method of constructing an above ground reservoir area according to any one of claims 1 to 5, characterised in that, The water storage system comprises an underground reservoir, a water storage area and a connecting pipe connecting the underground reservoir and the water storage area, and the connecting pipe is used for introducing water in the underground reservoir into the water storage area; wherein the water storage area is a coal mining subsidence area with a containing space, and the underground reservoir is adjacent to the coal mining subsidence area.
7. The water storage system of claim 6, wherein The bottom of the water storage area is sequentially laid with a broken stone layer, a geotextile layer and a sand soil layer.
Citation Information
Patent Citations
Power generation energy storage peak regulation system and method
CN108716447A
Water cut-off method for reservoir
JP2011256533A