An L-shaped dam drainage structure suitable for asphalt concrete core dams

Abstract

This utility model belongs to the field of water conservancy and hydropower engineering, specifically relating to an L-shaped dam body drainage structure suitable for asphalt concrete core wall dams. It includes a dam body composed of an upstream dam body filling area and a downstream dam body filling area. A transition layer is set between the upstream and downstream dam body filling areas, and an asphalt concrete core wall is set in the transition layer. An L-shaped drainage structure is set within the downstream dam body filling area, and a filter layer is set between the L-shaped drainage structure and the downstream dam body filling area. A drainage prism is set at the downstream slope toe of the dam body, and the L-shaped drainage structure connects to the drainage prism. The L-shaped drainage structure can intercept and discharge seepage from the upper part of the dam body, lowering the phreatic line to the interior of the drainage body, quickly guiding seepage water from the bottom of the asphalt concrete core wall, forming a three-dimensional drainage network, increasing the long-term reliability of the drainage body, and significantly improving the drainage capacity of the asphalt concrete core wall dam. Simultaneously, it can adjust with dam body settlement or deformation, avoiding drainage failure due to cracking of the rigid structure.

Description

Technical Field

[0001] This utility model relates to an L-shaped dam drainage structure suitable for asphalt concrete core wall dams, belonging to the field of water conservancy and hydropower engineering. Background Technology

[0002] As a type of earth-rock dam, the core seepage barrier of an asphalt concrete core wall dam is a flexible asphalt concrete core wall. Compared to traditional clay core walls, asphalt concrete core walls have advantages such as better crack resistance and stronger adaptability to deformation. However, its seepage control still faces the following challenges: First, the risk of local defect leakage, construction joints, temperature stress, or uneven foundation settlement may lead to local cracking of the core wall, resulting in concentrated seepage; second, the long-term aging effect, asphalt materials may age under long-term water pressure and chemical action, and the permeability coefficient may gradually increase; third, the dam shell saturation problem, if seepage is not discharged in time, the shear strength of the dam shell soil and rock will decrease after saturation, which may lead to dam slope instability. To solve the above problems, most asphalt concrete core wall dams currently use horizontal drainage bodies within the dam body, with drainage prisms at the ends of the horizontal drainage bodies to direct seepage downstream. However, the horizontal drainage bodies mainly collect seepage at the bottom of the core wall, and their interception effect on seepage in the middle and upper parts of the dam body (especially high dams) is poor, which can easily lead to local uplift of the phreatic line. Meanwhile, uneven settlement between the asphalt core and the dam shell material can easily lead to the separation of the horizontal drainage body from the core interface, forming a seepage channel. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an L-shaped dam body drainage structure suitable for asphalt concrete core wall dams. The L-shaped drainage structure forms a dual-path three-dimensional drainage network, which not only improves the drainage capacity of the dam body, but also can be adjusted according to the settlement or deformation of the dam body, avoiding drainage failure caused by cracking of the rigid structure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An L-shaped dam body drainage structure suitable for asphalt concrete core wall dams includes a dam body consisting of an upstream dam body filling area and a downstream dam body filling area. A transition layer is set between the upstream and downstream dam body filling areas, and an asphalt concrete core wall is set in the transition layer. An L-shaped drainage structure is set in the downstream dam body filling area. A filter layer is set between the L-shaped drainage structure and the downstream dam body filling area. A drainage prism is set at the downstream slope toe of the dam body, and the L-shaped drainage structure is connected to the drainage prism.

[0005] Furthermore, the L-shaped drainage structure comprises a vertical drainage body and a horizontal drainage body. The vertical drainage body is located outside the transition layer on the downstream side of the dam body, and the horizontal drainage body is located on the riverbed on the downstream side of the dam body. The horizontal drainage body is connected to the drainage prism.

[0006] Furthermore, the top of the vertical drainage body is located in the upper middle part of the dam body, the width W of the top of the vertical drainage body is 3-5m, and the lower part of the vertical drainage body is connected to the horizontal drainage body.

[0007] Furthermore, the maximum particle size of the filter layer material is no more than 80 mm, the content of particles with a particle size less than 5 mm is controlled between 20% and 25%, and the content of particles with a particle size less than 0.075 mm does not exceed 5%.

[0008] Furthermore, the top elevation of the drainage prism is higher than the downstream river level, with an inner slope ratio of 1:1 and an outer slope ratio of 1:2.

[0009] Furthermore, the maximum particle size of the vertical drainage body, horizontal drainage body, and drainage prism material particles does not exceed 500 mm, the content of particles with a particle size less than 5 mm does not exceed 15%, and the content of particles with a particle size less than 0.075 mm does not exceed 5%.

[0010] This utility model discloses an L-shaped dam drainage structure suitable for asphalt concrete core wall dams. Compared with the prior art, its advantages are as follows: On the one hand, the vertical drainage body increases the drainage area, which can intercept and discharge seepage in the upper part of the dam body, lower the seepage line to the inside of the drainage body, and combine with the horizontal drainage body to quickly drain the seepage water at the bottom of the asphalt concrete core wall, forming a dual-path three-dimensional drainage network, which increases the long-term reliability of the drainage body and significantly improves the drainage capacity of the asphalt concrete core wall dam. On the other hand, the L-shaped drainage structure can be adjusted according to the settlement or deformation of the dam body, avoiding drainage failure caused by cracking of the rigid structure. Attached Figure Description

[0011] Figure 1 This is a schematic cross-sectional view of a typical L-shaped dam drainage structure applicable to asphalt concrete core wall dams according to this utility model.

[0012] In the diagram: 1-Dam body, 2-Upstream dam body filling area, 3-Transition layer, 4-Asphalt concrete core wall, 5-Downstream dam body filling area, 6-Filter layer, 7-Vertical drainage body, 8-Horizontal drainage body, 9-Drainage prism. Detailed Implementation

[0013] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model and do not include all embodiments, but the scope of protection is not limited to the description.

[0014] Reference Appendix Figure 1As shown, this utility model relates to an L-shaped dam body drainage structure suitable for an asphalt concrete core wall dam, comprising a dam body 1 consisting of an upstream dam body filling area 2 and a downstream dam body filling area 5. A transition layer 3 is provided between the upstream dam body filling area 2 and the downstream dam body filling area 5, and an asphalt concrete core wall 4 is provided in the transition layer 3. An L-shaped drainage structure is provided in the downstream dam body filling area 5, and a filter layer 6 is provided between the L-shaped drainage structure and the downstream dam body filling area 5. A drainage prism 9 is provided at the downstream slope toe of the dam body 1, and the L-shaped drainage structure is connected to the drainage prism 9.

[0015] The main feature of this technical solution is the installation of an L-shaped drainage structure within the downstream dam filling area 5. This L-shaped drainage structure is connected to the drainage prism 9, and a filter layer 6 is installed between the L-shaped drainage structure and the downstream dam filling area 5. The L-shaped drainage structure can intercept and discharge seepage from the upper and middle parts of the dam body, lowering the phreatic line to the interior of the drainage body. Combined with the drainage prism 9, it can quickly guide and drain seepage water from the bottom of the asphalt concrete core wall 4, forming a three-dimensional drainage network. This increases the long-term reliability of the drainage body and significantly improves the drainage capacity of the asphalt concrete core wall dam. Furthermore, the L-shaped drainage structure can be adjusted according to the settlement or deformation of the dam body, avoiding drainage failure caused by cracking of the rigid structure.

[0016] Furthermore, the L-shaped drainage structure comprises a vertical drainage body 7 and a horizontal drainage body 8. The vertical drainage body 7 is located outside the transition layer 3 on the downstream side of the dam body 1, and the horizontal drainage body 8 is located on the riverbed on the downstream side of the dam body 1. The horizontal drainage body 8 is connected to the drainage prism 9. The slope ratio of the outer side of the vertical drainage body can be adjusted according to actual conditions to meet the requirements of mechanical operation. The vertical drainage body 7 can intercept and discharge the seepage in the middle and upper part of the dam body, forming a dual-path three-dimensional drainage network with the horizontal drainage body 8. Finally, the water is discharged into the river channel through the drainage prism 9.

[0017] Furthermore, the top of the vertical drainage body 7 is located in the upper middle part of the dam body 1 and is below the normal water level. The width W of the top of the vertical drainage body 7 is generally 3-5m, and the lower part of the vertical drainage body 7 connects with the horizontal drainage body 8. The maximum particle size of the filter layer 6 material does not exceed 80mm, the content of particles smaller than 5mm is controlled between 20% and 25%, and the content of particles smaller than 0.075mm does not exceed 5%. The top elevation of the drainage prism 9 is higher than the downstream river level, with an inner slope ratio of 1:1 and an outer slope ratio of 1:2. The maximum particle size of the materials of the vertical drainage body 7, horizontal drainage body 8, and drainage prism 9 does not exceed 500mm, the content of particles smaller than 5mm does not exceed 15%, and the content of particles smaller than 0.075mm does not exceed 5%.

[0018] By adopting the above-mentioned particle size ratio of the drainage body material, the drainage body structure can be made more robust, effectively preventing aging and settlement.

[0019] In addition to the above description, the following should also be noted where the attached drawings are not shown in detail: This embodiment has carried out numerical simulation calculations on the size, slope, seepage and seepage stability of the drainage body. In actual application, the above schemes can be reasonably selected and optimized by combining the calculation results.

[0020] The basic principles and main features of this utility model have been described above. However, the scope of protection of this utility model is not limited thereto. Those skilled in the art can make various changes and modifications to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as claimed. The scope of protection of this utility model is defined by the appended claims.

Claims

1. An L-shaped dam drainage structure suitable for asphalt concrete core dams, characterized in that... The dam body (1) consists of an upstream dam filling area (2) and a downstream dam filling area (5). A transition layer (3) is provided between the upstream dam filling area (2) and the downstream dam filling area (5). An asphalt concrete core wall (4) is provided in the transition layer (3). An L-shaped drainage structure is provided in the downstream dam filling area (5). A filter layer (6) is provided between the L-shaped drainage structure and the downstream dam filling area (5). A drainage prism (9) is provided at the downstream slope toe of the dam body (1). The L-shaped drainage structure is connected to the drainage prism (9).

2. The L-shaped dam drainage structure suitable for asphalt concrete core wall dams as described in claim 1, characterized in that... The L-shaped drainage structure consists of a vertical drainage body (7) and a horizontal drainage body (8). The vertical drainage body (7) is located outside the transition layer (3) on the downstream side of the dam body (1), and the horizontal drainage body (8) is located on the riverbed on the downstream side of the dam body (1). The horizontal drainage body (8) is connected to the drainage prism (9).

3. The L-shaped dam drainage structure suitable for asphalt concrete core wall dams as described in claim 2, characterized in that... The top of the vertical drainage body (7) is located in the upper middle part of the dam body (1), the width W of the top of the vertical drainage body (7) is 3-5m, and the lower part of the vertical drainage body (7) is connected to the horizontal drainage body (8).

4. The L-shaped dam drainage structure suitable for asphalt concrete core wall dams as described in claim 1, characterized in that... The top elevation of the drainage prism (9) is higher than the downstream river level, with an inner slope ratio of 1:1 and an outer slope ratio of 1:2.

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