Asphalt concrete core wall structure for earth and rockfill dam
By setting up a plastic buffer in the earth-rock dam to buffer uneven settlement, and by utilizing different structures and material selections for the straight and inclined wall sections, the problem of uneven settlement caused by the difference in deformation modulus between the asphalt concrete core wall and the seepage barrier wall was solved, thereby improving the stability and seepage prevention performance of the earth-rock dam.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-03-03
AI Technical Summary
The difference in deformation modulus between the asphalt concrete core wall and the anti-seepage wall in existing earth-rock dams leads to uneven settlement, causing foundation fracture and shear failure of the overburden layer, thus affecting the structural stability of the dam.
A gap is created between the concrete base and the impermeable wall and filled with plastic material. The elasticity and deformation capacity of the plastic material are used to buffer uneven settlement. By selecting different structures and materials for the straight and inclined wall sections, the structure can be adapted to different working environments, thereby enhancing the stability and durability of the core wall structure.
It improves the overall stability and seepage prevention performance of the dam structure, reduces the damage to the dam body caused by uneven settlement, and enhances the adaptability and durability of the core wall structure.
Smart Images
Figure CN223963899U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of earth-rock dam engineering technology, specifically to an asphalt concrete core wall structure for earth-rock dams. Background Technology
[0002] In the field of water conservancy engineering, earth-rock dams are a type of water-retaining structure constructed using earth, stone, or a mixture of materials through processes such as dumping and compaction. To further optimize the seepage prevention performance of earth-rock dams, asphalt concrete core walls are often constructed inside the dam in engineering practice, serving as the seepage prevention structure of the dam body.
[0003] However, in practical engineering applications, when using an asphalt concrete core wall and a cutoff wall as a seepage prevention system, the elastic modulus of the concrete cutoff wall and the deformation modulus of the overburden soil can differ by tens to hundreds of times. Under the self-weight of the dam, the cutoff wall experiences minimal settlement due to the constraint of the bedrock, while the overburden settles significantly. This leads to uneven settlement between the concrete base of the asphalt concrete core wall, the cutoff wall, and the adjacent soil, which can easily cause fracture of the foundation concrete and shear failure of the overburden soil, thereby affecting the overall stability of the dam structure. Summary of the Invention
[0004] In view of the above-mentioned technical problems, this utility model proposes an asphalt concrete core wall structure for earth-rock dams, including a seepage-proof wall, a concrete base, a straight wall section and an inclined wall section;
[0005] The seepage-proof wall is embedded in the bedrock, the concrete base is installed on top of the seepage-proof wall, and a gap is provided between the concrete base and the seepage-proof wall, which is filled with plastic.
[0006] The straight wall section is laid on a concrete base and is constructed using roller-compacted asphalt concrete.
[0007] The inclined wall section is connected to the straight wall section, and the inclined wall section slopes towards the downstream side of the earth-rock dam. The inclined wall section is constructed using cast-in-place asphalt concrete.
[0008] Preferably, a first transition layer is provided on the upstream side of the straight wall section and the inclined wall section, and a second transition layer is provided on the downstream side of the straight wall section and the inclined wall section.
[0009] Preferably, the top of the concrete base is provided with a groove, and the straight wall section is embedded in the groove.
[0010] Preferably, a water-stop copper plate is provided at the connection between the straight wall section and the concrete base, with one end of the water-stop copper plate embedded in the straight wall section and the other end of the water-stop copper plate embedded in the concrete base.
[0011] Preferably, a seepage-proof structure is provided between the inclined wall section and the straight wall section. The seepage-proof structure is constructed to form a seepage-proof body between the inclined wall section and the straight wall section using a sealing plate.
[0012] As a preferred embodiment, the seepage prevention structure also includes pre-embedded studs, which are arranged at the top of the straight wall section. The sealing plate is installed on the pre-embedded studs by nuts, and the top of the sealing plate is embedded in the inclined wall section.
[0013] Preferably, the cross-section of the plastic body in the vertical direction of the earth-rock dam body is inverted U-shape.
[0014] Compared with existing technologies, the asphalt concrete core wall structure for earth-rock dams provided by this utility model has the following substantial features and advancements: This asphalt concrete core wall structure for earth-rock dams creates a gap between the concrete base and the cutoff wall, filled with a plastic material. Utilizing the elasticity and deformation capacity of the plastic material, it buffers the uneven settlement caused by the difference in deformation modulus between the cutoff wall and the concrete base, reducing the destructive effect of uneven settlement on the dam structure and thus improving the overall stability of the dam structure. Furthermore, the different construction and material selection for the straight and inclined wall sections allow the core wall structure to better adapt to different working environments. The inclined wall section slopes towards the downstream side of the earth-rock dam and uses cast-in-place asphalt concrete, which better resists the water flow pressure and scouring effect from the downstream side; the straight wall section uses roller-compacted asphalt concrete, which is suitable for its own stress characteristics and construction requirements, enabling the core wall structure to perform well under different working conditions, thus improving the adaptability and durability of the core wall structure. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of an asphalt concrete core wall structure for an earth-rock dam according to an embodiment of this utility model.
[0016] Figure 2 yes Figure 1 A magnified schematic diagram of the structure at point A in the middle.
[0017] Figure 3 yes Figure 1 A magnified schematic diagram of the structure at point B in the middle.
[0018] Reference numerals: 1. Impermeable wall; 2. Concrete base; 3. Straight wall section; 4. Inclined wall section; 5. Plastic body; 6. First transition layer; 7. Second transition layer; 8. Impermeable structure; 9. Water-stop copper sheet; 81. Sealing plate; 82. Embedded stud; 83. Nut. Detailed Implementation
[0019] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0020] Existing seepage prevention systems using asphalt concrete core walls and cutoff walls suffer from uneven settlement between the cutoff wall, concrete base, and adjacent soil due to the large difference in deformation modulus between the concrete cutoff wall and the overburden soil under the dam's own weight. This leads to concrete fracture of the base and shear failure of the overburden soil. The present invention proposes an asphalt concrete core wall structure for earth-rock dams, which aims to improve the overall structural stability of the dam and enhance its seepage prevention performance.
[0021] This invention proposes an asphalt concrete core wall structure for earth-rock dams. By creating a gap between the concrete base and the cutoff wall and filling it with a plastic material, the elasticity and deformation capacity of the plastic material buffer the uneven settlement caused by the difference in deformation modulus between the cutoff wall and the concrete base. This reduces the destructive effect of uneven settlement on the dam structure, thereby improving the overall stability of the dam. Furthermore, the inclined wall section at the top effectively disperses water flow pressure through its sloping design, avoiding excessive local lateral pressure and reducing the risk of lateral displacement and overturning of the dam. Under water load, the upper inclined wall section tilts downstream, increasing the density of the asphalt concrete and ensuring the overall quality of the core wall. In addition, the inclined design of the wall section increases the path length of water flow within the dam body, enhancing the seepage prevention effect.
[0022] like Figure 1 As shown, an asphalt concrete core wall structure for earth-rock dams includes a seepage-proof wall 1, a concrete base 2, a straight wall section 3, and an inclined wall section 4.
[0023] like Figure 2 As shown, the impermeable wall 1 is embedded in the bedrock. A concrete base 2 is installed on top of the impermeable wall 1. A gap is provided between the concrete base 2 and the impermeable wall 1. The gap is filled with plastic material 5.
[0024] like Figure 1 As shown, the straight wall section 3 is laid on the concrete base 2. The straight wall section 3 is constructed using roller-compacted asphalt concrete.
[0025] Inclined wall segment 4 is connected to straight wall segment 3. Inclined wall segment 4 slopes towards the downstream side of the earth-rock dam. Inclined wall segment 4 is constructed using cast-in-place asphalt concrete.
[0026] The different construction and material selection of the straight wall section 3 and the inclined wall section 4 allow the core wall structure to better adapt to different working environments. The inclined wall section 4, which slopes towards the downstream side of the earth-rock dam and uses cast-in-place asphalt concrete, can better resist the water flow pressure and scouring effect on the downstream side. The straight wall section 3 uses roller-compacted asphalt concrete, which is suitable for its own stress characteristics and construction requirements, enabling the core wall structure to perform well under different working conditions and improving the adaptability and durability of the core wall structure.
[0027] For example, roller-compacted asphalt concrete is made by compacting asphalt mixtures mixed at a specific temperature using manual or mechanical methods. It has the characteristics of low asphalt-aggregate ratio and high strength, but relatively weak deformation capacity, thus making it suitable for parts of dam engineering with more stringent strength requirements.
[0028] Unlike roller-compacted asphalt concrete, cast-in-place asphalt concrete significantly improves the fluidity of the asphalt mixture by increasing the amount of asphalt used, allowing it to achieve compaction under its own weight. Cast-in-place asphalt concrete has superior deformation adaptability and is more suitable for engineering parts of dams that require higher deformation coordination.
[0029] like Figure 1 As shown, a first transition layer 6 is provided on the upstream side of the straight wall section 3 and the inclined wall section 4, and a second transition layer 7 is provided on the downstream side of the straight wall section 3 and the inclined wall section 4.
[0030] The first transition layer 6 is located upstream of the straight wall section 3 and the inclined wall section 4, and is used to buffer the direct impact of upstream water pressure on the core wall structure. Since the water pressure fluctuates frequently with changes in water level, the transition layer can disperse this impact force, preventing structural damage to the straight wall section 3 and the inclined wall section 4 due to concentrated stress, thereby improving the stability of the entire core wall structure under hydraulic action.
[0031] For example, the first transition layer 6 is made of sandy soil with a certain particle size distribution and a moderate content of fine particles. Its permeability coefficient is between that of the asphalt concrete core wall and the anti-seepage soil of the upstream dam body. It has good compaction performance, can form a relatively dense structure after compaction, and is relatively inexpensive, easy to obtain, and easy to construct. The sandy soil transition layer can effectively prevent fine particles in the upstream water from entering the pores of the asphalt concrete core wall, avoiding pore blockage and affecting the anti-seepage performance of the core wall. At the same time, the particle structure of the sandy soil can buffer the direct impact of upstream water pressure on the core wall to a certain extent, playing a protective role for the core wall.
[0032] The second transition layer 7 is located on the downstream side to coordinate the deformation differences between the downstream dam material and the core wall structure. The downstream side of the earth-rock dam is subject to the influence of the dam's own weight and the external environment, resulting in complex deformation. The transition layer can play a connecting role, preventing cracks or separation between the downstream dam material and the core wall due to deformation incoordination, and maintaining the integrity and stability of the dam structure.
[0033] For example, the second transition layer 7 is made of well-graded sand and gravel, composed of sand and gravel of different particle sizes, exhibiting good particle size distribution and high porosity. The sand and gravel have high strength and strong resistance to deformation, enabling them to adapt to the complex deformation conditions of the downstream dam body. As a transition layer on the downstream side, the sand and gravel transition layer can quickly drain any seepage water that may occur between the downstream dam body and the core wall, preventing water accumulation inside the dam body. Simultaneously, the good particle size distribution maintains structural stability during dam deformation, coordinating the deformation differences between the core wall and the downstream dam body.
[0034] like Figure 2 As shown, the cross-section of the plastic body 5 in the vertical direction of the earth-rock dam body is inverted U-shape. On the one hand, the inverted U-shaped cross-section design significantly increases the contact area between the plastic body 5 and the concrete base 2 and the cutoff wall 1. Under the self-weight of the dam body and external loads, the larger contact area can better disperse stress and avoid structural damage caused by concentrated stress. For example, when the dam body experiences uneven settlement due to water impoundment, the inverted U-shape of the plastic body 5 can evenly transfer the pressure from the concrete base 2 to the cutoff wall 1, effectively preventing the concrete base from cracking or the cutoff wall 1 from being damaged locally due to stress concentration, thereby greatly enhancing the stability of the dam structure.
[0035] On the other hand, during the operation of an earth-rock dam, different parts will undergo varying degrees of deformation. The inverted U-shaped cross-section of the plastic body 5 gives it a unique advantage in adapting to deformation. Its wider upper part can buffer the larger deformation of the concrete foundation 2, while its narrower and deeper lower part can flexibly adapt to the relatively smaller deformation of the anti-seepage wall 1. When the deformation of different parts of the dam is inconsistent, it can coordinate the differences between the two through its own elastic deformation, reduce the risk of structural damage caused by inconsistent deformation, and ensure the long-term safe operation of the dam.
[0036] like Figure 1 As shown, a groove is provided on the top of the concrete base 2. The straight wall section 3 is embedded in the groove. This design greatly increases the contact area between the straight wall section 3 and the concrete base 2. This not only significantly increases the friction between the two, but also provides effective horizontal restraint on the straight wall section 3, better resisting horizontal thrust from inside the earth-rock dam. This effectively prevents the straight wall section 3 from shifting or collapsing, significantly enhancing the stability of the connection between the straight wall section 3 and the concrete base 2, thereby ensuring the stability of the entire asphalt concrete core wall structure.
[0037] like Figure 2As shown, a water-stop copper plate 9 is installed at the connection between the straight wall section 3 and the concrete base 2. One end of the water-stop copper plate 9 is embedded in the straight wall section 3, and the other end is embedded in the concrete base 2. The water-stop copper plate 9 is embedded in the straight wall section 3 and the concrete base 2, tightly fitting the structures on both sides and blocking possible seepage channels for water flow. Even under high water pressure, it can effectively prevent water from passing through the connection, ensuring the seepage prevention effect inside the dam.
[0038] In addition, when the dam body is displaced or deformed, the water-stop copper sheet 9, with its good flexibility and tensile strength, can transfer stress to a certain extent, thereby enhancing the collaborative working ability between the straight wall section 3 and the concrete base 2, thus improving the integrity and stability of the entire core wall structure.
[0039] like Figure 1 As shown, a seepage-proof structure 8 is provided between the inclined wall section 4 and the straight wall section 3. The seepage-proof structure 8 is constructed to form a seepage-proof body between the inclined wall section 4 and the straight wall section 3 using a sealing plate 81.
[0040] like Figure 1 Combination Figure 3 As shown, the seepage prevention structure 8 also includes embedded studs 82. The embedded studs 82 are arranged at the top of the straight wall section 3. The sealing plate 81 is installed on the embedded studs 82 by nuts 83. The top of the sealing plate 81 is embedded in the inclined wall section 4.
[0041] In this way, during the operation of the earth-rock dam, the dam body is subjected to complex stresses, such as vertical pressure generated by its own weight, horizontal thrust caused by water pressure, and expansion and contraction stress caused by temperature changes. The connection system composed of pre-embedded studs 82 and nuts 83 can effectively transfer these stresses, enabling the straight wall section 3 and the inclined wall section 4 to work together and enhancing the overall integrity of the core wall structure. The top of the sealing plate 81 is embedded in the inclined wall section 4, further increasing the contact area and friction between the two, preventing relative displacement or separation of the straight wall section 3 and the inclined wall section 4 under stress, and improving the stability of the entire asphalt concrete core wall structure.
[0042] This utility model is not limited to the specific technical solutions described in the above embodiments. Besides the above embodiments, this utility model may have other implementation methods. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An asphalt concrete core wall structure for earth-rock dams, characterized in that, It includes a seepage-proof wall (1), a concrete base (2), a straight wall section (3), and an inclined wall section (4); The impermeable wall (1) is embedded in the bedrock, and the concrete base (2) is installed on the top of the impermeable wall (1). A gap is provided between the concrete base (2) and the impermeable wall (1), and the gap is filled with plastic (5). The straight wall section (3) is laid on the concrete base (2), and the straight wall section (3) is constructed using roller-compacted asphalt concrete. The inclined wall section (4) is connected to the straight wall section (3), the inclined wall section (4) is inclined towards the downstream side of the earth-rock dam, and the inclined wall section (4) is constructed using cast-in-place asphalt concrete.
2. The asphalt concrete core wall structure for earth-rock dams according to claim 1, characterized in that, A first transition layer (6) is provided on the upstream side of the straight wall section (3) and the inclined wall section (4), and a second transition layer (7) is provided on the downstream side of the straight wall section (3) and the inclined wall section (4).
3. The asphalt concrete core wall structure for earth-rock dams according to claim 1, characterized in that, The top of the concrete base (2) is provided with a groove, and the straight wall section (3) is embedded in the groove.
4. The asphalt concrete core wall structure for earth-rock dams according to claim 3, characterized in that, A water-stop copper plate (9) is provided at the connection between the straight wall section (3) and the concrete base (2). One end of the water-stop copper plate (9) is embedded in the straight wall section (3), and the other end of the water-stop copper plate (9) is embedded in the concrete base (2).
5. The asphalt concrete core wall structure for earth-rock dams according to claim 1, characterized in that, An anti-seepage structure (8) is provided between the inclined wall section (4) and the straight wall section (3). The anti-seepage structure (8) is configured to form an anti-seepage body between the inclined wall section (4) and the straight wall section (3) using a sealing plate (81).
6. The asphalt concrete core wall structure for earth-rock dams according to claim 5, characterized in that, The seepage prevention structure (8) also includes a pre-embedded stud (82), which is arranged on the top of the straight wall section (3). The sealing plate (81) is installed on the pre-embedded stud (82) by a nut (83), and the top of the sealing plate (81) is embedded in the inclined wall section (4).
7. The asphalt concrete core wall structure for earth-rock dams according to claim 1, characterized in that, The plastic body (5) has an inverted U-shaped cross section in the vertical height direction of the earth-rock dam body.