Improvement method for flat plate of strip mine dump in arid region

Abstract

The invention relates to the technical field of dumping sites, and provides an improvement method for a flat plate of a strip mine dumping site in an arid region. According to the improvement method, for each transformed flat plate group, through coordination and cooperation of a retaining wall arranged at the top of a flat plate step, a ridge-like terrain laid between the retaining wall and a slope surface, a water collecting pool arranged at the junction of the flat plate step and the slope surface and a water storage layer between the two flat plate steps, the water containing capacity of a flat plate rock stratum of the waste dump is improved, and meanwhile the water storage capacity of the flat plate rock stratum of the waste dump is improved. The influence of wind and sand on plants on the flat plate of the dump and surface water evaporation is reduced, water storage and salt reversion and regular irrigation are achieved, the problem of water resource shortage is solved, it is guaranteed that sufficient water can be continuously obtained in the plant growth and development period, and the survival rate and growth rate of plants in the arid region are increased.

Description

Technical Field

[0001] This application relates to the technical field of waste dumps, and particularly to an improved method for the bench of an open-pit mine waste dump in arid areas. Background Art

[0002] The ecological environment of arid open-pit coal mines is fragile, with relatively high soil salinity. The average annual rainfall is about 5% of the annual evaporation, which has a great impact on the survival, growth and development of plants in arid regions.

[0003] Generally, shrubs and herbaceous plants are planted on the benches of the waste dumps in arid open-pit mines, and standard retaining walls are set up around the benches of the waste dumps. While ensuring safety, the impact of wind and sand on plants and surface water is reduced. However, a single retaining wall can only reduce the impact of wind and sand in a small area, and has little effect on arid areas with a high evaporation rate of water.

[0004] Therefore, there is an urgent need to provide a technical solution to address the deficiencies of the above-mentioned existing technologies. Summary of the Invention

[0005] The purpose of this application is to provide an improved method for the bench of an open-pit mine waste dump in arid areas to solve or alleviate the problems existing in the above-mentioned existing technologies.

[0006] To achieve the above purpose, this application provides the following technical solutions:

[0007] This application provides an improved method for the bench of an open-pit mine waste dump in arid areas, which is used to improve a plurality of stepped groups of reformed benches. Each of the reformed bench groups includes n adjacent stepped bench steps, where n = {2, 3}, and n is a positive integer; the improvement method includes: setting a retaining wall at the top of each bench step of the waste dump, and laying a continuous ridge-like terrain between the retaining wall of the i-th bench step and the i-th slope of the waste dump; where i < n, and i is a positive integer;

[0008] A first collection pool is provided at the junction of the i-th bench step and the i-th slope, and the altitude of the first collection pool is lower than that of the i-th bench step; a second collection pool is provided at the junction of the (i + 1)-th bench step and the (i + 1)-th slope, and the altitude of the second collection pool is lower than that of the (i + 1)-th bench step; in each reformed bench group, a water-proof layer is provided between the second collection pool and the (i + 1)-th slope;

[0009] An i-th aquifer is arranged between the i-th flat step and the i+1-th flat step; wherein, the i-th aquifer extends along the parallel direction of the i-th flat step to the extension surface of the i+1-th slope surface, and then extends upward along the parallel direction of the i+1-th slope surface to the i+1-th water collection tank, and is connected with the i+1-th water collection tank.

[0010] Preferably, each of the flat steps is paved with an impermeable layer, an aquifer, a topsoil layer, an anti-evaporation layer and the ridge-like terrain in a counter-inclined manner from bottom to top; wherein, the paving is carried out in a direction inclined downward by at least 5 degrees from the corresponding flat step to the corresponding slope.

[0011] Preferably, the aquifer, the topsoil layer and the anti-evaporation layer in each of the flat steps are connected to the side of the corresponding water collection pool.

[0012] Preferably, the waterproof layer in the i-th flat step extends to the bottom of the i-th water collection tank along a direction parallel to the i-th flat step, and then extends to the i+1-th water collection tank along a direction parallel to the i-th aquifer.

[0013] Preferably, in each of the flat steps, the waterproof layer is laid with a thickness of 10 cm to 20 cm, the aquifer is laid with a thickness of 50 cm to 60 cm, the topsoil layer is laid with a thickness of 50 cm to 60 cm, and the anti-evaporation layer is laid with a thickness of 10 cm.

[0014] Preferably, the i+1th water collection tank is provided with an automatic valve located at the end of the i-th aquifer; in response to the water level in the i+1th water collection tank reaching a preset water level, the automatic valve of the i+1th water collection tank opens, connecting the i+1th water collection tank with the i-th aquifer, so that the water in the i+1th water collection tank flows into the i-th aquifer.

[0015] Preferably, the lower parts of the ith water collection pool and the (i+1)th water collection pool are filled with rock fragments, and the upper parts are covered with topsoil.

[0016] Preferably, in each of the modified flat plate groups, a drip irrigation pipe network is provided on each of the flat plate steps, and the drip irrigation pipe network of each of the flat plate steps is connected to the first water collection tank through the same water pump.

[0017] Preferably, in the ridge-like terrain, the interval width between two adjacent depressions is 20 cm to 40 cm; and / or, the height difference between the high platform and the depression in the ridge-like terrain is 20 cm to 40 cm.

[0018] Preferably, plants are planted in the low-lying areas of the ridge-like terrain; and / or the aquifer is filled with coal gangue and rock fragments.

[0019] Beneficial effects:

[0020] The improved method for the flat pan of an open-pit mine dump in an arid area provided in an embodiment of the present application is used to improve a plurality of stepped modified flat pan groups, each of which includes two or three adjacent stepped flat pan steps. During the improvement process, a retaining wall is set at the top of each flat pan step of the dump, and a continuous ridge-like terrain is laid between the retaining wall of the ith flat pan step and the ith slope of the dump; an ith water collection pool is set at the junction of the ith flat pan step and the ith slope; the altitude of the ith water collection pool is lower than that of the ith flat pan step, and at the ith+ ith flat pan step, a continuous ridge-like terrain is laid between the retaining wall of the ith flat pan step and the ith slope of the dump; the ith water collection pool is set at a lower altitude than that of the ith flat pan step, and at the ith+ ith flat pan step, a continuous ridge-like terrain is laid between the retaining wall of the ith flat pan step and the ith slope of the dump; the ith water collection pool is set at a lower altitude than that of the ith flat pan step, and at the ith+ ith flat pan step, a continuous ridge-like terrain is laid between the retaining wall of the ith flat pan step and the ith slope of the dump; the ith water collection pool is set at a higher altitude than that of the ith flat pan step, and at the ith+ ith flat pan step, a continuous ridge-like terrain is laid between the retaining wall of the ith flat pan step and the ith slope of the dump; ... An i+1th water collecting pool is set at the junction of the 1st flat step and the i+1th slope, and the altitude of the i+1th water collecting pool is lower than that of the i+1th flat step; an impermeable layer is set between the i+1th water collecting pool and the i+1th slope; an i-th aquifer is set between the i-th flat step and the i+1th flat step, and the i-th aquifer extends along the parallel direction of the i-th flat step to the extension surface of the i+1th slope, and then extends upward along the parallel direction of the i+1th slope to the i+1th water collecting pool, and is connected with the i+1th water collecting pool.

[0021] Therefore, for each renovated flat plate group, through the coordinated cooperation of the retaining wall set on the top of the flat plate steps, the ridge-like terrain laid between the retaining wall and the slope, the collection pool set at the junction of the flat plate steps and the slope, and the aquifer between the two flat plate steps, while improving the water holding capacity of the rock layer of the flat plate of the spoil dump, the impact of wind and sand on the plants on the flat plate of the spoil dump and the evaporation of surface water is reduced, and water storage and desalination and regular irrigation are achieved. After irrigation, the water collection structure is used to store water and reuse it multiple times, which reduces the water consumption of vegetation restoration in arid areas, alleviates the problem of water shortage, ensures that plants can continue to get sufficient water during their growth and development, and improves the survival rate and growth rate of plants in arid areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0023] in:

[0024] Figure 1 It is a schematic diagram of an improvement of the flat plate structure of a spoil dump provided according to some embodiments of the present application;

[0025] Figure 2 for Figure 1 Schematic diagram of the improvement of the flat plate group including two flat plate steps in the flat plate structure of the spoil dump;

[0026] Figure 3 for Figure 2 The local schematic diagram of the A in the middle;

[0027] Figure 4 for Figure 2 A top view schematic diagram of the modified flat disc group is shown.

[0028] Description of reference numerals:

[0029] 1. Water-blocking layer; 2. Aquifer; 3. Topsoil layer; 4. Retaining wall; 5. Evaporation-proof layer; 6. Ridge-like topography; 7. Collection pool; 8. Aquifer; 9. Automatic valve; 10. Water level sensor; 11. Water collection area. DETAILED DESCRIPTION

[0030] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the embodiments of the present invention should belong to the scope of protection of the embodiments of the present invention.

[0031] In arid areas with high water evaporation, water resources are scarce. The existing spoil dump structure and standard retaining wall can only reduce the impact of wind and sand in a small area. In addition, the flat rock layer has poor water holding capacity and cannot achieve effective transformation of arid areas with high water evaporation, resulting in plants being unable to obtain sufficient water during their growth and development.

[0032] Based on this, the present application proposes a method for improving the flat pan of an open-pit mine spoil dump in an arid area. Through the coordinated cooperation of the retaining wall set on the top of the flat pan step, the concave-convex terrain (i.e., ridge-like terrain) laid between the retaining wall and the slope of the spoil dump, the collection pool set at the foot of the slope of the spoil dump, and the aquifer between the two flat pan steps, the water holding capacity of the rock layer of the spoil dump flat pan is improved while reducing the impact of wind and sand on the plants on the spoil dump flat pan and the evaporation of surface water, and realizing water storage, desalination, and regular irrigation, thereby alleviating the problem of water shortage, ensuring that plants can continue to obtain sufficient water during their growth and development, and improving the survival rate and growth rate of plants in arid areas.

[0033] The improved method for the flat pan of the open-pit mine dump in arid areas is used to improve a plurality of stepped flat pan groups, each of which includes n adjacent stepped flat pan steps, wherein n={2,3}, and n is a positive integer. That is, each of the modified flat pan groups includes two stepped flat pan steps, or each of the modified evaluation groups includes three stepped flat pan steps.

[0034] like Figures 1 to 4 As shown, in this improved method, retaining walls 4 are provided at the tops of each bench step of the waste dump. A continuous ridged terrain 6 is laid between the retaining wall 4 of the i-th bench step and the i-th slope of the waste dump; a i-th catchment pond 7 is provided at the junction of the i-th bench step and the i-th slope, and the altitude of the i-th catchment pond 7 is lower than that of the i-th bench step; an (i + 1)-th catchment pond 7 is provided at the junction of the (i + 1)-th bench step and the (i + 1)-th slope, and the altitude of the (i + 1)-th catchment pond 7 is lower than that of the (i + 1)-th bench step; an impermeable layer 1 is provided between the (i + 1)-th catchment pond 7 and the (i + 1)-th slope. Among them, i < n and i is a positive integer.

[0035] That is to say, in each transformed bench group, multiple bench steps are included in sequence from bottom to top. The catchment pond 7 corresponding to the lowest bench step (the catchment pond 7 with the lowest altitude) is the 1st catchment pond 7, and no impermeable layer 1 is provided between the 1st catchment pond 7 and the 1st slope; starting from the 2nd bench step, an impermeable layer 1 is provided between the catchment pond 7 corresponding to each bench step and its corresponding slope.

[0036] An i-th water storage layer 8 is provided between the i-th bench step and the (i + 1)-th bench step. After the i-th water storage layer 8 extends along the parallel direction of the i-th bench step to the extension surface of the (i + 1)-th slope, it extends upward along the parallel direction of the (i + 1)-th slope to the (i + 1)-th catchment pond 7 and is connected to the (i + 1)-th catchment pond 7.

[0037] In each transformed bench group, retaining walls 4 are provided with the top of the bench step as the boundary to reduce the influence of wind and sand. A continuous ridged terrain 6 is laid between the retaining wall 4 of each bench step and its corresponding slope, and a catchment pond 7 is excavated at the connection between the ridged terrain 6 and the toe of the slope; the catchment pond 7 corresponding to the upper bench step is connected to the catchment pond 7 corresponding to the lower bench step through the water storage layer 8, so that in each transformed bench, multiple adjacent upper and lower bench steps form a water storage whole, further improving the water storage capacity of the bench.

[0038] In each bench step, an impermeable layer 1, an aquifer 2, a topsoil layer 3, an anti-evaporation layer 5, and a ridged terrain 6 are laid in reverse inclination sequence from bottom to top, and the impermeable layer 1, the aquifer 2, the topsoil layer 3, the anti-evaporation layer 5, and the ridged terrain 6 are laid in the direction of at least 5 degrees downward inclination from the corresponding bench step to the slope. The aquifer 2, the topsoil layer 3, and the anti-evaporation layer 5 in the i-th bench step are all connected to the side surface of the i-th catchment pond 7, and the aquifer 2, the topsoil layer 3, and the anti-evaporation layer 5 in the (i + 1)-th bench step are all connected to the side surface of the (i + 1)-th catchment pond 7. Thus, after the bench step is irrigated, water and salt can migrate to the corresponding catchment pond 7 in the direction of at least 5 degrees downward inclination from the bench step to the slope.

[0039] Among them, the lower part of the i-th water collection pool 7 and the i+1-th water collection pool 7 are filled with rock fragments, and the upper part is covered with topsoil. That is to say, the lower part of each water collection pool 7 is filled with rock fragments, and the upper part of the rock fragments is covered with topsoil, so that water and salt are transported to the corresponding water collection pool 7, and the rock fragments can be used to effectively store water and desalinate; at the same time, the filled rock fragments and topsoil layer can also effectively reduce the evaporation of water in the water collection pool 7.

[0040] In the lower flat plate step of the reformed flat plate group, i.e., the i-th flat plate step, the water-blocking layer 1 extends to the bottom of the i-th water collection pool 7 along the parallel direction of the i-th flat plate step, and then extends to the i+1-th water collection pool 7 along the direction parallel to the i-th aquifer 8, specifically, extends to the side of the i+1-th water collection pool 7. That is to say, one side of the i+1-th water collection pool 7 is connected to the aquifer 2, topsoil layer 3, and anti-evaporation layer 5 of the i+1-th flat plate step, and the aquifer 8 and water-blocking layer 1 are laid on the other side of the i+1-th water collection pool 7. One side of the i-th water collection pool 7 is connected to the aquifer 2, topsoil layer 3, and anti-evaporation layer 5 of the i-th flat plate step, and the other side of the i-th water collection pool 7 is the i-th slope surface, and the bottom of the i-th water collection pool 7 is the aquifer 8 and water-blocking layer 1 extending to the other side of the i+1-th water collection pool 7.

[0041] The i-th collecting tank 7 and the i+1-th collecting tank 7 are connected via the i-th aquifer 8. Furthermore, the i+1-th collecting tank 7 is provided with an automatic valve 9 located at the end of the i-th aquifer 8. In response to the water level in the i+1-th collecting tank 7 reaching a preset water level, the automatic valve 9 of the i+1-th collecting tank 7 opens, connecting the i+1-th collecting tank 7 with the i-th aquifer 8, so that the water in the i+1-th collecting tank 7 flows into the i-th aquifer 8.

[0042] That is to say, automatic valves 9 can be set at both ends of the i-th aquifer 8, and the i-th water collection tank 7 and the i+1-th water collection tank 7 can be connected and disconnected by controlling the opening and closing of the automatic valves 9. Specifically, a water level sensor 10 (such as a water level meter) is set in the i+1-th water collection tank 7. When the water level sensor 10 detects that the water level in the i+1-th water collection tank 7 reaches the set water level, the automatic valve 9 set at the end of the i-th aquifer 8 is controlled to open, so that the water in the i+1-th water collection tank 7 flows into the i-th aquifer 8, and / or flows into the i-th water collection tank 7 through the i-th aquifer 8.

[0043] In a specific application scenario, automatic valves 9 are set at both ends of the i-th aquifer 8, and the water in the i+1-th water collection tank 7 is controlled to flow into the i-th aquifer 8 through the automatic valve 9 close to the i+1-th water collection tank 7; at the same time, a corresponding water level sensor 10 (such as a water level meter) is set in the i-th water collection tank 7. When the water level sensor 10 in the i-th water collection tank 7 detects that the water level in the i-th water collection tank 7 reaches the set water level, the automatic valve 9 at the end of the i-th aquifer 8 close to the i-th water collection tank 7 is controlled to open, so that the water in the i-th water collection tank 7 flows into the i-th aquifer 8.

[0044] In the present application, in each modified flat plate group, a drip irrigation network is provided on each flat plate step, and the drip irrigation network of each flat plate step is connected to the first water collection tank 7 through the same water pump pipeline. That is to say, in each modified flat plate group, the water in the i+1th water collection tank 7 enters the ith water collection tank 7 through the aquifer 8, and circulates downward in sequence until the water is collected in the lowest water collection tank 7, that is, the water collection tank 7 corresponding to the first flat plate step of the modified flat plate group, and the water in the first water collection tank 7 is pumped out by the water pump, and the pumped water is transported to the drip irrigation network provided on the ith flat plate step, and the plants planted on the ith flat plate step are drip-irrigated along the drip irrigation network provided on the ith flat plate step. After the plants planted on the flat plate step are drip-irrigated by the drip irrigation network, the water can penetrate downward into the stratum, and the remaining water resources can also be collected in the aquifer 8 and the water collection tank 7 to realize the recycling of water resources.

[0045] In a specific example, a water collection area 11 is set between the rock fragments filled in the first water collection pool 7, so that the water in the first water collection pool 7 passes through the rock fragments and enters the water collection area 11. Then, a water pump pumps water through the water collection area 11 and transports the water to the drip irrigation network set on the i-th flat plate step.

[0046] In the ridge-like terrain 6 of the present application, the interval width between two adjacent low-lying areas is 20cm to 40cm; the height difference between the high platform and the low-lying areas of the ridge-like terrain 6 is 20cm to 40cm; plants are planted in the low-lying areas of the ridge-like terrain 6 to further improve the survival rate of the plants. During the transformation process, the interval width between two adjacent low-lying areas and the height difference between the high platform and the low-lying areas of the ridge-like terrain 6 are adjusted according to the wind speed of the area. When the wind speed is high, the interval width between two adjacent low-lying areas takes a smaller value, and the height difference between the high platform and the low-lying areas takes a larger value; when the wind speed is low, the interval width between two adjacent low-lying areas takes a larger value, and the height difference between the high platform and the low-lying areas takes a smaller value.

[0047] In this application, the thickness of the waterproof layer 1 is 10cm-20cm, the thickness of the aquifer 2 is 50cm-60cm, the thickness of the topsoil layer 3 is 50cm-60cm, and the thickness of the anti-evaporation layer 5 is 10cm. The aquifer 8 is filled with coal gangue and rock fragments. When performing soil discharge operations, it is only necessary to discharge soil in a normal manner, which will not be described in detail here.

[0048] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0051] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for improving the flat plate of open-pit mine dump in arid areas, characterized in that: For improving multiple stepped modified bench groups, each of the modified bench groups includes adjacent n stepped bench steps, where n = {2, 3} and n is a positive integer; the improvement method includes: Setting retaining walls at the tops of each of the bench steps in the waste dump, and laying a continuous ridge-like terrain between the retaining wall of the i-th bench step and the i-th slope of the waste dump; where i < n and i is a positive integer; A first i-th water collection pool is provided at the junction of the i-th bench step and the i-th slope, and the altitude of the first i-th water collection pool is lower than that of the i-th bench step; a (i + 1)-th water collection pool is provided at the junction of the (i + 1)-th bench step and the (i + 1)-th slope, and the altitude of the (i + 1)-th water collection pool is lower than that of the (i + 1)-th bench step; in each of the modified bench groups, a waterproof layer is provided between the (i + 1)-th water collection pool and the (i + 1)-th slope; A first i-th water storage layer is provided between the i-th bench step and the (i + 1)-th bench step; where the first i-th water storage layer extends along the parallel direction of the i-th bench step to the extension surface of the (i + 1)-th slope, and then extends upward along the parallel direction of the (i + 1)-th slope to the (i + 1)-th water collection pool and is communicated with the (i + 1)-th water collection pool.

2. The method for improving the flat plate of the open-pit mine dump in arid areas according to claim 1 is characterized in that: Each of the bench steps is sequentially and inversely inclined from bottom to top with a waterproof layer, an aquifer, a topsoil layer, an anti-evaporation layer, and the ridge-like terrain; where it is laid in a direction inclined downward by at least 5 degrees along the corresponding bench step to the corresponding slope.

3. The method for improving the flat plate of the open-pit mine dump in arid areas according to claim 2 is characterized in that: The aquifer, the topsoil layer, and the anti-evaporation layer in each of the bench steps are all communicated with the side surface of the corresponding water collection pool.

4. The method for improving the flat plate of the open-pit mine dump in arid areas according to claim 2 is characterized in that: The waterproof layer in the i-th bench step extends along the parallel direction of the i-th bench step to below the i-th water collection pool, and then extends along the parallel direction of the first i-th water storage layer to the (i + 1)-th water collection pool.

5. The method for improving the flat plate of the open-pit mine dump in arid areas according to claim 2, characterized in that: In each of the bench steps, the laying thickness of the waterproof layer is 10 cm to 20 cm, the laying thickness of the aquifer is 50 cm to 60 cm, the laying thickness of the topsoil layer is 50 cm to 60 cm, and the laying thickness of the anti-evaporation layer is 10 cm.

6. The method for improving the flat plate of the open-pit mine dump in arid areas according to claim 1, characterized in that: An automatic valve is provided at the end of the first i-th water storage layer in the (i + 1)-th water collection pool; in response to the water level in the (i + 1)-th water collection pool reaching a preset water level, the automatic valve of the (i + 1)-th water collection pool opens, communicating the (i + 1)-th water collection pool with the first i-th water storage layer, so that the water in the (i + 1)-th water collection pool flows into the first i-th water storage layer.

7. The method for improving the flat plate of the open-pit mine dump in arid areas according to claim 1, characterized in that: The lower parts of the i-th water collection pool and the (i + 1)-th water collection pool are both filled with rock fragments, and the upper parts are both covered with topsoil.

8. The method for improving the flat plate of the open-pit mine dump in arid areas according to claim 1, characterized in that: In each of the modified bench groups, a drip irrigation pipe network is provided on each of the bench steps, and the drip irrigation pipe networks of each of the bench steps are communicated with the first water collection pool through the same water pump.

9. The method for improving the flat plate of open-pit mine dump in arid areas according to claim 1, characterized in that: In the ridge-like terrain, the interval width between two adjacent low-lying areas is 20 cm to 40 cm; And / or The height difference between the high platform and the low-lying area in the ridge-like terrain is 20 cm to 40 cm.

10. The method for improving the flat plate of the open-pit mine dump in arid areas according to any one of claims 1 to 9, characterized in that: Plants are planted in the low-lying areas of the ridge-like terrain; and / or the aquifer is filled with coal gangue and rock fragments.

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