Anti-seepage structure for preventing tailing pond dam body from seepage damage
By designing anti-seepage structures, including anti-seepage core wall, grouting curtain, drainage mattress and anti-seepage layer, an anti-seepage system of "front blocking and rear rowing" was built, and the problem of susceptibility to penetration and damage of the tailings pond dam body was solved, achieving significant anti-seepage effect and low-cost construction.
Patent Information
- Application Number
- CN202421542173.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-02
AI Technical Summary
The dam body of tailings ponds is susceptible to infiltration and damage, resulting in a risk of dam collapse, and the existing technology is difficult to effectively prevent such hidden dam collapses.
An anti-seepage structure was designed, including the anti-seepage core wall of the tailings pond dam body, the dam foundation grouting curtain, strip-shaped drainage mattress and anti-seepage layer. Through these components, a "front blocking and rear row" anti-seepage system was built.
It significantly improves the anti-seepage effect of tailings dam, which is convenient to construct, simple to operate, has a long service life and low cost, and can effectively reduce the risk of dam collapse caused by infiltration damage.
Smart Images
Figure CN222796313U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of tailings pond engineering, and in particular relates to an anti-seepage structure for preventing the dam body of a tailings pond from being damaged by penetration. Background Art
[0002] Tailings dams are dams formed by the accumulation and rolling of tailings. They are divided into tailings accumulation dams and initial dams. They play a great role in the protection and governance of the mining environment. They are mainly used to store tailings or other industrial waste slag discharged after ore sorting in metal and non-metal mines. Unlike reservoirs, which require anti-seepage, tailings ponds require drainage, otherwise mudslides are likely to form. If the tailings contain harmful substances, they must be treated before the tailings water can be discharged. my country discharges more than 1.5 billion tons of slag every year, and the cumulative tailings stockpile is as high as 14.6 billion tons. The scale of discharge shows an increasing trend. The tailings recycling rate is 18.9%, and more than 80% of the slag is stored in tailings ponds. Once a dam breaks, it will cause immeasurable and irreparable losses to the safety of life and property of downstream residents and the ecological environment. According to statistics, tailings pond accidents caused by water as the cause of tailings pond dam failure account for more than 50% of the total tailings pond accidents. However, seepage damage is a relatively hidden way of dam failure, which is not easy to be detected, and the resulting dam failure is characterized by strong suddenness. Therefore, it is very necessary to develop an anti-seepage structure to prevent the tailings pond dam body from seepage damage to reduce the tailings pond dam failure caused by seepage damage. Utility Model Content
[0003] The purpose of the utility model is to solve the above-mentioned problem and provide an anti-seepage structure for preventing the dam body of a tailings pond from being damaged by seepage. By designing the anti-seepage structure of the dam body of the tailings pond, a good anti-seepage effect of "front blocking and rear discharge" can be achieved.
[0004] In order to achieve the above technical purpose, the utility model adopts the following technical scheme.
[0005] A seepage-proof structure for preventing seepage damage to a tailings pond body, comprising a tailings pond dam body, an anti-seepage core wall of the tailings pond dam body, a dam foundation grouting curtain and a strip-shaped drainage mattress; the anti-seepage core wall of the tailings pond dam body is arranged in the center of the tailings pond dam body and inclined upstream, and the bottom end of the anti-seepage core wall of the tailings pond dam body is connected to the bottom of the tailings pond dam body; the dam foundation grouting curtain is arranged directly below the anti-seepage core wall of the tailings pond dam body, and the top of the dam foundation grouting curtain is connected to the bottom of the tailings pond dam body; the strip-shaped drainage mattress is arranged at the bottom of the back water surface of the tailings pond dam body; and an anti-seepage layer is provided on the front water surface of the tailings pond dam body.
[0006] The anti-seepage layer includes a coarse sand cushion layer on the water-facing surface of the dam body, an artificial anti-seepage lining layer and a filter layer. The filter layer is laid on the water-facing surface of the tailings pond dam body. The filter layer is composed of filter material with a thickness of 10 to 20 cm. The filter material particles in the filter layer gradually increase along the direction of water flow. The artificial anti-seepage lining layer and the coarse sand cushion layer on the water-facing surface of the dam body are laid in sequence on top of the filter layer. The coarse sand cushion layer on the water-facing surface of the dam body is composed of fine-grained sandy clay with a thickness of 5 to 10 cm.
[0007] The anti-seepage core wall of the tailings pond dam body is an impermeable asphalt concrete straight core wall. The anti-seepage core wall of the tailings pond dam body includes an anti-seepage core wall and a core wall transition layer. The anti-seepage core wall is arranged at the center of the anti-seepage core wall of the tailings pond dam body, and a core wall transition layer is provided between the anti-seepage core wall and the tailings pond dam body.
[0008] The bottom base of the anti-seepage core wall of the tailings pond dam body to the dam top is set to a gradual thickness. The surface of the connection between the base of the anti-seepage core wall of the tailings pond dam body and the rigid building at the bottom of the tailings pond dam body is a rough surface. The rough surface is first sprayed with 0.2kg / m 2 After the cationic emulsified asphalt and diluted asphalt are fully dried, 2cm thick asphalt mortar is laid.
[0009] The dam foundation grouting curtain adopts high-pressure rotary jet grouting technology, which uses a mixture of high-pressure water and compressed air to be delivered to the nozzle, causing a jet to cut the bottom layer. At the same time, the pressure transports the cement slurry to another nozzle, fills the slots, and penetrates into the gravel bottom layer of the slot wall to condense into an anti-seepage wall. In the mud wall drilled hole formed, the high-pressure nozzle is gradually lifted from bottom to top to form a full-hole high-seepage anti-seepage curtain.
[0010] The drainage layer thickness of the strip-shaped drainage mattress is 0.5m, and the drainage material is gravel, the particle size of the gravel is not less than 5mm, the mud content is less than 5%, and the relative density is greater than 0.75; the depth of the strip-shaped drainage mattress into the tailings pond dam body is the width of the tailings pond dam bottom. , the strip drainage mattress forms a slope of 1% toward the downstream direction.
[0011] The artificial anti-seepage lining is a high-density polyethylene HDFE film.
[0012] Compared with the prior art, the utility model has the following beneficial effects:
[0013] The utility model discloses a novel anti-seepage structure, which has remarkable anti-seepage effect on tailings dam, and has convenient construction and simple operation; it has long service life and low cost; the anti-seepage system composed of the anti-seepage core wall of the dam body, the grouting curtain of the dam foundation, the coarse sand cushion layer on the water-facing surface of the dam body, the filter layer and the strip-shaped drainage mattress can achieve a good anti-seepage effect of "front blocking and rear drainage". BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0015] Figure 1 The utility model discloses an anti-seepage structure for preventing the dam body of a tailings pond from being damaged by seepage.
[0016] Figure 2 It is a structural schematic diagram of the anti-filter layer of the utility model.
[0017] Figure 3 It is a cross-sectional view of the anti-seepage core wall of the tailings pond dam body of the utility model.
[0018] In the figure, 1. tailings pond dam body; 2. anti-seepage core wall of tailings pond dam body; 3. dam foundation grouting curtain; 4. coarse sand cushion layer on the water-facing side of dam body; 5. artificial anti-seepage lining layer; 6. anti-filtration layer; 7. strip drainage mattress; 8. anti-seepage core wall; 9. core wall transition layer. DETAILED DESCRIPTION
[0019] In order to facilitate those skilled in the art to understand and implement the present invention, the following is a detailed description of each step of the method proposed in the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.
[0020] Example 1
[0021] like Figure 1 As shown, an anti-seepage structure for preventing seepage damage to the tailings pond dam body comprises a tailings pond dam body 1, an anti-seepage core wall 2 of the tailings pond dam body, a dam foundation grouting curtain 3 and a strip-shaped drainage mattress 7; the anti-seepage core wall 2 of the tailings pond dam body is arranged in the center of the tailings pond dam body 1 and inclined upstream, and the bottom end of the anti-seepage core wall 2 of the tailings pond dam body is connected to the bottom of the tailings pond dam body 1; the dam foundation grouting curtain 3 is arranged directly below the anti-seepage core wall 2 of the tailings pond dam body, and the top of the dam foundation grouting curtain 3 is connected to the bottom of the tailings pond dam body 1; the strip-shaped drainage mattress 7 is arranged at the bottom of the back water surface of the tailings pond dam body 1; and an anti-seepage layer is provided on the front water surface of the tailings pond dam body 1.
[0022] Specifically, the anti-seepage layer includes a coarse sand cushion layer 4 on the water-facing surface of the dam body, an artificial anti-seepage lining layer 5 and an anti-filtration layer 6. The anti-filtration layer 6 is laid on the water-facing surface of the tailings pond dam body 1. Figure 2As shown, the filter layer 6 is composed of filter material with a thickness of 10 to 20 cm, and the filter material particles of the filter layer 6 gradually increase in the direction of the water flow; the artificial anti-seepage lining 5 and the coarse sand cushion layer 4 on the water-facing surface of the dam body are laid in sequence on the filter layer 6, and the coarse sand cushion layer 4 on the water-facing surface of the dam body is composed of fine-grained sandy clay with a thickness of 5 to 10 cm.
[0023] Specifically, Figure 3 As shown, the anti-seepage core wall 2 of the tailings pond dam body is an impermeable asphalt concrete straight core wall. The anti-seepage core wall 2 of the tailings pond dam body includes an anti-seepage core wall 8 and a core wall transition layer 9. The anti-seepage core wall 8 is arranged at the center of the anti-seepage core wall 2 of the tailings pond dam body, and a core wall transition layer 9 is provided between the anti-seepage core wall 8 and the tailings pond dam body 1.
[0024] Specifically, the bottom base of the tailings dam body anti-seepage core wall 2 to the dam top is set to a gradual thickness, and the surface of the connection between the base of the tailings dam body anti-seepage core wall 2 and the rigid building at the bottom of the tailings dam body 1 is a rough surface, and 0.2kg / m 2 After the cationic emulsified asphalt and diluted asphalt are fully dried, 2cm thick asphalt mortar is laid.
[0025] In this embodiment, the dam foundation grouting curtain 3 adopts high-pressure rotary jet grouting technology, and a mixture of high-pressure water and compressed air is delivered to the nozzle, causing a jet to cut the bottom layer. At the same time, the pressure transports the cement slurry to another nozzle to fill the slots and penetrate into the gravel bottom layer of the slot wall to condense into an anti-seepage wall. In the mud wall drilled hole formed, the high-pressure nozzle is gradually lifted from bottom to top to form a full-hole high-seepage curtain.
[0026] In this embodiment, the drainage layer thickness of the strip-shaped drainage mattress 7 is 0.5m, the drainage material is gravel, the grain size of the gravel is not less than 5mm, the mud content is less than 5%, and the relative density is greater than 0.75; the strip-shaped drainage mattress 7 penetrates into the tailings pond dam body 1 to a depth of the tailings pond dam body 1 bottom width The strip-shaped drainage mattress 7 forms a slope of 1% in the downstream direction. The design of the strip-shaped drainage mattress 7 is not only convenient for construction, but also has higher drainage quality and efficiency.
[0027] In this embodiment, the artificial anti-seepage lining 5 is a high-density polyethylene HDFE film, which has better anti-seepage performance and durability.
[0028] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.
Claims
1. An anti-seepage structure for preventing the dam body of a tailings pond from being damaged by seepage, characterized in that: The invention comprises a tailings pond dam body (1), a tailings pond dam body anti-seepage core wall (2), a dam foundation grouting curtain (3) and a strip-shaped drainage mattress (7); the tailings pond dam body anti-seepage core wall (2) is arranged at the center of the tailings pond dam body (1) and is inclined upstream, and the bottom end of the tailings pond dam body anti-seepage core wall (2) is connected to the bottom of the tailings pond dam body (1); the dam foundation grouting curtain (3) is arranged directly below the tailings pond dam body anti-seepage core wall (2), and the top of the dam foundation grouting curtain (3) is connected to the bottom of the tailings pond dam body (1); the strip-shaped drainage mattress (7) is arranged at the bottom of the backwater surface of the tailings pond dam body (1); and the frontwater surface of the tailings pond dam body (1) is provided with an anti-seepage layer.
2. The anti-seepage structure for preventing the dam body of a tailings pond from being damaged by seepage according to claim 1, characterized in that: The anti-seepage layer comprises a coarse sand cushion layer (4) on the water-facing surface of the dam body, an artificial anti-seepage lining layer (5) and an inverted filter layer (6); the inverted filter layer (6) is laid on the water-facing surface of the tailings pond dam body (1); the inverted filter layer (6) is composed of filter material with a thickness of 10 to 20 cm; the filter material particles of the inverted filter layer (6) gradually increase in the direction of the water flow; the artificial anti-seepage lining layer (5) and the coarse sand cushion layer (4) on the water-facing surface of the dam body are laid in sequence on top of the inverted filter layer (6); the coarse sand cushion layer (4) on the water-facing surface of the dam body is composed of fine-grained sandy clay with a thickness of 5 to 10 cm.
3. The anti-seepage structure for preventing the dam body of a tailings pond from being damaged by seepage according to claim 1, characterized in that: The tailings pond dam body anti-seepage core wall (2) is an impermeable asphalt concrete straight core wall, the tailings pond dam body anti-seepage core wall (2) comprises an anti-seepage core wall (8) and a core wall transition layer (9), the anti-seepage core wall (8) is arranged at the center of the tailings pond dam body anti-seepage core wall (2), and a core wall transition layer (9) is provided between the anti-seepage core wall (8) and the tailings pond dam body (1).
4. The anti-seepage structure for preventing the dam body of a tailings pond from being damaged by seepage according to claim 3, characterized in that: The thickness of the tailings pond dam body anti-seepage core wall (2) from the bottom base to the dam top is set to be gradually variable, and the surface of the rigid building connection between the base of the tailings pond dam body anti-seepage core wall (2) and the bottom of the tailings pond dam body (1) is rough, and asphalt mortar with a thickness of 2 cm is laid on the rough surface.
5. The anti-seepage structure for preventing the dam body of a tailings pond from being damaged by seepage according to claim 1, characterized in that: The drainage layer thickness of the strip-shaped drainage mattress (7) is 0.5m, the drainage material is gravel, the grain size of the gravel is not less than 5mm, the mud content is less than 5%, and the relative density is greater than 0.75; the strip-shaped drainage mattress (7) penetrates into the tailings pond dam body (1) to a depth of 1 / 2 of the width of the dam bottom of the tailings pond dam body (1). The strip-shaped drainage mattress (7) forms a slope of 1% in the downstream direction.
6. The anti-seepage structure for preventing the dam body of a tailings pond from being damaged by seepage according to claim 2, characterized in that: The artificial anti-seepage lining (5) is a high-density polyethylene (HDFE) film.