Leakage drainage structure for metal mine dump slope

Abstract

The utility model discloses a metal mine dumping site slope leakage drainage structure, and relates to the technical field of metal mine dumping site slope ecological restoration, the metal mine dumping site slope leakage drainage structure comprises an AMD leakage point, a blind ditch, an AMD drainage and drainage main pipe and an AMD drainage and drainage branch pipe, the blind ditch is arranged outside the AMD leakage point, the AMD drainage and drainage branch pipe is installed inside the blind ditch, and the AMD drainage and drainage main pipe is connected with the AMD leakage point. According to the AMD drainage and drainage branch pipe system, the AMD drainage and drainage main pipe and the AMD drainage and drainage branch pipe are well connected, and effective flow guiding is conducted on AMD leakage points of the side slope of the metal mine dump to the maximum extent; the AMD acidic wastewater is neutralized in situ through the limestone layer at the bottom of the AMD drainage and drainage main pipe, and is subsequently guided and drained to a downstream mine wastewater treatment system, so that the acidity of the drained wastewater is effectively neutralized.

Description

Technical Field

[0001] The utility model relates to the technical field of ecological restoration of slopes in waste dumps of metal mines, and particularly relates to a leakage drainage structure for slopes in waste dumps of metal mines. Background Art

[0002] The leakage drainage structure for slopes in waste dumps of metal mines is designed for a drainage system structure after the completion of metal mine exploitation. To prevent the slag layer from leaking AMD wastewater from the inside out due to factors such as high groundwater level or surface drainage outcrops, it will cause damage to the originally repaired soil improvement layer, and the overlying vegetation will be eroded by the AMD wastewater and unable to survive.

[0003] In the prior art, for non-ferrous metal mines, the soil in areas such as waste lands and waste dumps is strongly acidic. Generally, plants are suitable to grow in a soil environment close to neutral. Therefore, this strongly acidic soil is not conducive to plant growth and will also have an inhibitory effect on the growth of plants. At the same time, in addition to the inhibitory effect on plant growth, high concentrations of H+ and excessive salt concentrations will also cause the inactivation of the plant enzyme system, damage to the cell membrane, inhibition of plant respiration and the absorption of water and nutrient elements by the roots; therefore, the restoration of waste lands in metal mines has always been a major problem in the industry. After the acid mine restoration, due to factors such as high groundwater level or surface drainage outcrops, the slag layer will leak AMD wastewater from the inside out, resulting in damage to the originally repaired soil improvement layer, and the overlying vegetation will be eroded by the AMD wastewater and unable to survive.

[0004] In view of this, it is particularly important to take the method of "combining drainage and blocking" according to local conditions to construct the mine drainage system, improve the drainage system around the mine area, avoid a large area of external water from entering the waste dump, and at the same time take an effective drainage method for AMD on the slope to maximize the drainage of AMD wastewater outcropping on the slope surface and avoid its erosion of the repaired vegetation layer. Therefore, the drainage of seepage flow on the slopes of waste dumps in metal mines is particularly important and is an important means to consolidate the ecological restoration effect of acid mine slopes. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problem in the prior art that due to factors such as high groundwater level or surface drainage outcrops, the slag layer will leak AMD wastewater from the inside out, resulting in damage to the originally repaired soil improvement layer, and the overlying vegetation will be eroded by the AMD wastewater and unable to survive, and a leakage drainage structure for slopes in waste dumps of metal mines is proposed.

[0006] To achieve the above object, the utility model adopts the following technical solutions: A leakage drainage structure for the slope of a waste dump in a metal mine, including AMD leakage points, blind ditches, AMD drainage main pipes, and AMD drainage branch pipes. A blind ditch is arranged outside the AMD leakage points, an AMD drainage branch pipe is installed inside the blind ditch, and one end of the AMD drainage branch pipe is fixedly connected to the AMD drainage main pipe.

[0007] Preferably, a blind ditch with dimensions of 1500mm×1500mm×550mm is arranged with the AMD leakage point on the slope as the center and expanding outward.

[0008] Preferably, the AMD drainage main pipe is wrapped with geotextile, and the geotextile is polyester long filament needle-punched non-woven geotextile with a quality of not less than 200g / ㎡.

[0009] Preferably, the AMD drainage main pipe is made of HDPE material, and the AMD drainage branch pipe is made of HDPE material.

[0010] Preferably, the AMD drainage branch pipe is located on the side of the AMD drainage main pipe, and the AMD drainage branch pipe and the AMD drainage main pipe have a perforated structure with a 45° offset opening, and the interval between the AMD drainage branch pipes is 10m.

[0011] Preferably, a gravel drainage layer is covered on the AMD drainage main pipe, the thickness of the gravel drainage layer is 300mm, the gravel particle size of the gravel drainage layer is 30 - 50mm, and the calcium carbonate content in the gravel is not higher than %, and a limestone layer is covered under the AMD drainage main pipe, and the thickness of the limestone layer is 200mm.

[0012] Preferably, the AMD drainage main pipe is a solid HDPE pipe at the toe of the slope, the connection method between the AMD drainage main pipe and the AMD drainage branch pipe is welding, and the connection position between the AMD drainage main pipe and the AMD drainage branch pipe is reinforced with a repair joint.

[0013] Preferably, a soil improvement layer is covered on the gravel drainage layer, and a restoration vegetation layer is planted on the upper part of the soil improvement layer.

[0014] Compared with the prior art, the advantages and positive effects of the utility model are as follows:

[0015] 1. In the utility model, the system enables good connection between the AMD drainage main pipe and the AMD drainage branch pipe, and effectively diverts the AMD leakage points on the slope of the waste dump in the metal mine to the greatest extent.

[0016] 2. In the present utility model, the AMD acidic wastewater is in-situ neutralized by the limestone layer at the bottom of the main AMD drainage pipe, and then drained to the downstream mine wastewater treatment system to effectively neutralize the acidity of the discharged wastewater.

[0017] 3. In the present utility model, for the AMD leakage points within 10 m, multiple AMD drainage branch pipes share one main AMD drainage pipe to the main drainage pipeline, maximizing the reduction of project investment.

[0018] 4. In the present utility model, both the main AMD drainage pipe and the branch drainage pipes are wrapped with 200 g / ㎡ polyester filament needle-punched non-woven geotextile to prevent pipeline blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a schematic structural diagram of a slope leakage drainage structure of a waste dump in a metal mine proposed by the present utility model;

[0020] Figure 2 FIG. is a schematic cross-sectional structural diagram of a slope leakage drainage structure of a waste dump in a metal mine proposed by the present utility model;

[0021] Figure 3 FIG. is a schematic structural diagram of the cross-section of the main AMD drainage pipe in a slope leakage drainage structure of a waste dump in a metal mine proposed by the present utility model.

[0022] LEGEND DESCRIPTION: 1. AMD leakage point; 2. Blind ditch; 3. AMD drainage branch pipe; 4. Main AMD drainage pipe; 5. Geotextile; 6. Gravel diversion layer; 7. Limestone layer; 8. Soil improvement layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0024] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.

[0025] Example 1: As Figure 1 - Figure 3As shown in the figure, the utility model provides a leakage drainage structure for the slope of a metal mine waste dump, which includes an AMD leakage point 1, a blind ditch 2, an AMD drainage main pipe 4, and an AMD drainage branch pipe 3. A blind ditch 2 is arranged outside the AMD leakage point 1, and an AMD drainage branch pipe 3 is installed inside the blind ditch 2. One end of the AMD drainage branch pipe 3 is fixedly connected to the AMD drainage main pipe 4. A blind ditch 2 with a size of 1500mm×1500mm×550mm is arranged with the AMD leakage point 1 on the slope as the center and expanded outward. A gravel drainage layer 6 is covered on the AMD drainage main pipe 4, and the thickness of the gravel drainage layer 6 is 300mm. The gravel particle size of the gravel drainage layer 6 is 30-50mm, and the calcium carbonate content in the gravel is not higher than 10%. A limestone layer 7 is covered under the AMD drainage main pipe 4, and the thickness of the limestone layer 7 is 200mm. The AMD drainage main pipe 4 is a solid HDPE pipe at the foot of the slope. The connection method between the AMD drainage main pipe 4 and the AMD drainage branch pipe 3 is welding. The connection position between the AMD drainage main pipe 4 and the AMD drainage branch pipe 3 is reinforced with a repair joint. A soil improvement layer 8 is covered on the gravel drainage layer 6, and a restoration vegetation layer is planted on the upper part of the soil improvement layer.

[0026] Specifically, the specific settings and functions of this embodiment are as follows. This system enables a good connection between the AMD drainage main pipe 4 and the AMD drainage branch pipe 3, and effectively diverts the AMD leakage point 1 on the slope of the metal mine waste dump to the greatest extent. The limestone layer 7 at the bottom of the AMD drainage main pipe 4 in-situ neutralizes the AMD acidic wastewater, and then it is diverted to the downstream mine wastewater treatment system to effectively neutralize the pH of the discharged wastewater.

[0027] Embodiment 2: As Figure 2 and Figure 3 shown, the AMD drainage main pipe 4 is wrapped with a geotextile 5. The geotextile 5 is a polyester filament needle-punched non-woven geotextile, and the quality of the geotextile 5 is not less than 200g / ㎡. The AMD drainage main pipe 4 is made of HDPE material, and the AMD drainage branch pipe 3 is made of HDPE material. The AMD drainage branch pipe 3 is located on the side of the AMD drainage main pipe 4, and the AMD drainage branch pipe 3 and the AMD drainage main pipe 4 have a perforated structure with a 45° offset opening. The interval between the AMD drainage branch pipes 3 is 10m.

[0028] The effect achieved by the entire embodiment is that for the AMD leakage points 1 within a range of 10m, multiple AMD drainage branch pipes 3 share one AMD drainage main pipe 4 to the main drainage pipeline, which maximally reduces the project investment. The AMD main drainage pipe and the branch drainage pipes are all wrapped with 200g / ㎡ polyester filament needle-punched non-woven geotextiles to avoid pipeline blockage.

[0029] Usage method and working principle of the device: The system enables a good connection between the main AMD drainage pipe 4 and the AMD drainage branch pipes 3, and effectively diverts the AMD leakage points 1 on the slopes of the waste dumps in metal mines to the greatest extent. The AMD acidic wastewater is in-situ neutralized by the limestone layer 7 at the bottom of the main AMD drainage pipe 4, and then diverted to the downstream mine wastewater treatment system to effectively neutralize the pH of the discharged wastewater. For the AMD leakage points 1 within a range of 10 m, multiple AMD drainage branch pipes 3 share one main AMD drainage pipe 4 to the main drainage pipeline, minimizing the project investment. Both the main AMD drainage pipe and the branch drainage pipes are wrapped with 200 g / ㎡ polyester filament needle-punched non-woven geotextiles to prevent pipeline blockage.

[0030] The above is only the preferred embodiment of the present invention, and it is not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A metal mine dump slope seepage drainage structure, characterized by: The invention comprises an AMD leakage point (1), a blind ditch (2), an AMD drainage and drainage main pipe (4), and an AMD drainage and drainage branch pipe (3). The blind ditch (2) is provided outside the AMD leakage point (1), an AMD drainage and drainage branch pipe (3) is installed inside the blind ditch (2), and one end of the AMD drainage and drainage branch pipe (3) is fixedly connected to the AMD drainage and drainage main pipe (4).

2. A metal mine dump slope seepage drainage structure according to claim 1, characterized in that: The AMD leakage point (1) is a blind ditch (2) extending outward from the center and having a size of 1500mm×1500mm×550mm.

3. The metal mine dump slope seepage drainage structure according to claim 1, characterized in that: The AMD drainage main pipe (4) is wrapped with a geotextile (5) on the outside. The geotextile (5) is made of polyester filament needle-punched non-woven geotextile. The mass of the geotextile (5) is not less than 200g / ㎡.

4. The metal mine dump slope seepage drainage structure according to claim 1, characterized in that: The AMD drainage main pipe (4) is made of HDPE material, and the AMD drainage branch pipe (3) is made of HDPE material.

5. The metal mine dump slope seepage drainage structure according to claim 1, characterized in that: The AMD drainage branch pipe (3) is located on the side of the AMD drainage main pipe (4), and the AMD drainage branch pipe (3) and the AMD drainage main pipe (4) are perforated structures with holes staggered at 45 degrees, and the intervals between the AMD drainage branch pipes (3) are 10 meters.

6. The metal mine dump slope seepage drainage structure according to claim 1, characterized in that: The AMD drainage main pipe (4) is covered with a crushed stone drainage layer (6), the thickness of the crushed stone drainage layer (6) is 300 mm, and the AMD drainage main pipe (4) is covered with a limestone layer (7), the thickness of the limestone layer (7) is 200 mm.

7. The metal mine dump slope seepage drainage structure according to claim 1, characterized in that: The AMD drainage main pipe (4) is a HDPE solid pipe at the slope foot, the AMD drainage main pipe (4) and the AMD drainage branch pipe (3) are connected by welding, and the connection position between the AMD drainage main pipe (4) and the AMD drainage branch pipe (3) is reinforced by a repair joint.

8. The metal mine dump slope seepage drainage structure according to claim 6, characterized in that: The gravel diversion layer (6) is covered with a soil improvement layer (8), and a restoration vegetation layer is planted on the top of the soil improvement layer (8).

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