A pile-arch combined retaining dam suitable for soft soil

Abstract

The present invention discloses a pile-arch combined water retaining dam suitable for soft soil strata, comprising a rigid water retaining dam, a dam body joint, a bottom plate, a pile foundation, an arch end support, a vertical anti-seepage wall and a horizontal anti-seepage blanket. The rigid water retaining dam is a horizontal arch structure that bends upstream on a plane, and transmits the horizontal force of the reservoir water from the arch structure to the mountains or bearing piers on both sides, thereby meeting the horizontal resistance requirements of the dam body; the pile foundation is the dam body foundation above the soft soil stratum, and is made of reinforced concrete bored piles to meet the requirements of vertical bearing capacity and control of vertical deformation; the bottom plate is located at the bottom of the rigid water retaining dam, and the bottom plate extends upstream and is connected to the horizontal anti-seepage blanket. The vertical anti-seepage wall is arranged upstream of the dam body, and the top of the vertical anti-seepage wall is embedded in the horizontal anti-seepage blanket to meet the overall anti-seepage requirements of the water retaining dam. The present invention comprehensively utilizes the structural advantages of the arch structure, foundation piles and anti-seepage wall to meet the functional requirements of water retaining dams on soft soil strata.

Description

Technical Field

[0001] The invention relates to a water retaining dam in a water conservancy and hydropower project, and in particular to a pile-arch combined water retaining dam suitable for soft soil layers. Background Art

[0002] In low-bearing-capacity strata, especially soft soil strata, the construction of retaining dams requires overcoming the problems of low foundation bearing capacity and balancing the horizontal force of reservoir water.

[0003] Chinese patent CN211948277U provides a water retaining dam set on a low-bearing-capacity foundation. The plate-shaped water retaining plate reduces the weight of the water retaining dam and expands the foundation to improve the bearing capacity of the foundation. However, for soft soil layers with lower bearing capacity, it is difficult to meet the bearing capacity requirements of the water retaining dam foundation by simply expanding the contact surface area between the foundation and the low-bearing-capacity foundation. At the same time, this type of dam has poor horizontal bearing capacity.

[0004] The use of pile foundations can improve the vertical bearing capacity of soft soil foundations, but the effect of resisting horizontal forces is poor, especially under the action of horizontal forces, the horizontal deformation is large and the stability is poor. Especially under earthquake conditions, the ability of the dam body to resist downstream sliding is still poor. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a pile-arch combined water retaining dam suitable for soft soil formations, featuring a rational force distribution and a simple structure. On the one hand, the horizontal force of reservoir water is borne by the arch ends on both sides, while vertical forces such as gravity are borne by the pile foundation, thus resolving the problem of pile foundations' poor resistance to horizontal forces in soft soil formations. On the other hand, by constraining horizontal displacement through the horizontal arch ends, horizontal displacement of the foundation pile tops can be reduced, effectively enhancing the vertical bearing capacity of the pile foundation in soft soil.

[0006] The technical solution adopted by the present invention is: a pile-arch combined water retaining dam suitable for soft soil strata, comprising a rigid water retaining dam, a bottom plate, a pile foundation, an arch end support, a vertical anti-seepage wall and a horizontal anti-seepage blanket; the rigid water retaining dam is a horizontal arch structure curved upstream on a plane, and relies on the arch structure to transmit the horizontal force of the reservoir water from the arch end to the mountains or bearing piers on both sides, so as to increase the ability of the dam body to resist horizontal sliding and improve the safety and bearing capacity of the water retaining dam; the pile foundation adopts reinforced concrete bored piles to achieve the purpose of meeting the vertical bearing capacity of the dam body and controlling settlement deformation; considering the The connection between the rigid water retaining dam and the horizontal anti-seepage blanket and the need for the concrete structure to resist cracking and seepage, the bottom plate is located at the bottom of the rigid water retaining dam, and the bottom plate extends upstream and is connected to the horizontal anti-seepage blanket to coordinate the deformation difference between the vertical anti-seepage wall and the dam body; the arch end supports are located at the left and right bank ends of the dam body, and are suitable for asymmetric mountains on both sides; the vertical anti-seepage wall is set upstream of the dam body, is a concrete structure, and the top is embedded in the front end of the horizontal anti-seepage blanket, and is cast in place with the horizontal anti-seepage blanket concrete to form a whole, and the depth of the vertical anti-seepage wall must meet the anti-seepage requirements.

[0007] Furthermore, the rigid water retaining dam is provided with dam body joints, which are arranged radially along the dam body to divide the dam body into several dam sections and dam blocks, making it convenient to divide the dam sections and cast in layers, thereby reducing the temperature load of the dam body and preventing the generation of concrete cracks.

[0008] Furthermore, the reinforced concrete cast-in-place piles of the pile foundation may be arranged in a rectangular or plum blossom shape according to the bearing capacity requirements.

[0009] The beneficial effects of the present invention are:

[0010] 1. The pile-arch combined retaining dam transmits the horizontal force of the reservoir water to the mountains or bearing piers on both sides through the arch structure, relying on the mountains to balance the horizontal force and improve the dam's ability to resist horizontal deformation.

[0011] 2. Utilize the dam's foundation piles to address vertical bearing capacity and deformation issues. The soft soil layer is reinforced with reinforced concrete cast-in-place piles to form a composite foundation, significantly improving the foundation's vertical bearing capacity and resistance to deformation. Furthermore, the dam's floor extends upstream, increasing the contact area between the dam and the foundation and reducing the foundation's bearing capacity.

[0012] 3. Use the upstream vertical cut-off wall to solve the seepage problem. Set up a vertical cut-off wall upstream of the retaining dam bottom plate. The vertical cut-off wall is embedded in the front end of the horizontal cut-off blanket and connected to the bottom plate. This structure can extend the seepage path and effectively reduce the seepage of the dam foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a plan view of the present invention;

[0014] Figure 2 yes Figure 1 A-A cross-section diagram.

[0015] In the figure: 1—rigid retaining dam; 2—dam body joint; 3—bottom plate; 4—arch end support; 5—pile foundation; 6—vertical anti-seepage wall; 7—horizontal anti-seepage blanket; 8—soft soil layer; 9—bearing layer; 10—mountain dam abutment. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to the accompanying drawings.

[0017] As attached Figures 1 and 2 As shown, the present invention provides a pile-arch combined water retaining dam suitable for soft soil strata, comprising a rigid water retaining dam 1, a dam body joint 2, a bottom plate 3, an arch end support 4, a pile foundation 5, a vertical anti-seepage wall 6, and a horizontal anti-seepage blanket 7. The rigid water retaining dam 1 is an upwardly curved arch in the horizontal plane, transmitting horizontal forces to the mountain dam abutment 10. The asymmetric mountain dam abutment 10 is provided with an arch end support 4 to improve the load-bearing conditions. The pile foundation 5 is located in the soft soil layer 8, with its lower portion extending to the bearing layer 9. Reinforced concrete cast-in-place piles are used to form a composite foundation to withstand vertical loads. The vertical anti-seepage wall 6 is a reinforced concrete structure with a longitudinal length equal to the width of the rigid water retaining dam 1. The top of the vertical anti-seepage wall 6 is embedded in the horizontal anti-seepage blanket 7 and cast integrally with the horizontal anti-seepage blanket 7. The bottom plate 3 extends upstream and connects to the horizontal anti-seepage blanket 7 to accommodate the deformation difference between the vertical anti-seepage wall 6 and the rigid water retaining dam 1.

[0018] The pile foundation 5 is arranged in a rectangular or plum blossom shape, has a diameter of generally 120 cm, and extends below to a reliable bearing layer 9 .

[0019] The vertical anti-seepage wall 6 is generally 60 cm to 80 cm thick, and its bottom penetrates the soft soil layer 8 and is embedded in the stratum to a sufficient depth to meet the anti-seepage requirements.

[0020] An expansion joint is provided between the horizontal anti-seepage blanket 7 and the bottom plate 3, and a water-stop copper sheet and caulking material are provided in the expansion joint.

[0021] The above embodiments describe the present invention in conjunction with the accompanying drawings, but they should not be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, technical solutions obtained by equivalent replacement or equivalent transformation methods all fall within the scope of protection of the present invention.

Claims

1. A pile-arch combined retaining dam suitable for soft soil strata, characterized by: It includes a rigid water retaining dam, a bottom plate, a pile foundation, an arch end support, a vertical anti-seepage wall and a horizontal anti-seepage blanket; the rigid water retaining dam is a horizontal arch structure that bends upstream on a plane; the pile foundation is the foundation of the dam body above the soft soil layer, and adopts reinforced concrete bored piles; the bottom plate is located at the bottom of the rigid water retaining dam, and the bottom plate extends upstream and is connected to the horizontal anti-seepage blanket; the arch end support is located at both ends of the left and right banks of the dam body; the vertical anti-seepage wall is arranged upstream of the dam body, is a concrete structure, and the top is embedded in the front end of the horizontal anti-seepage blanket, and is cast in place with the horizontal anti-seepage blanket concrete to form a whole; the rigid water retaining dam is provided with dam body joints, and the dam body joints are arranged along the radial direction of the dam body.

2. The pile-arch combined water retaining dam suitable for soft soil according to claim 1, characterized in that: The reinforced concrete cast-in-place piles of the pile foundation are arranged in a rectangular or plum blossom shape according to the bearing capacity requirements.

3. The pile-arch combined water retaining dam suitable for soft soil strata according to claim 1, characterized in that: The longitudinal length of the vertical cut-off wall is the same as the width of the rigid retaining dam.

4. The pile-arch combined water retaining dam suitable for soft soil strata according to claim 1, characterized in that: The thickness of the vertical anti-seepage wall is 60 to 80 cm, the bottom of which penetrates the soft soil layer and is embedded in the stratum to a sufficient depth to meet the anti-seepage requirements.

5. The pile-arch combined water retaining dam suitable for soft soil strata according to claim 1, characterized in that: An expansion joint is provided between the horizontal anti-seepage blanket and the bottom plate, and the expansion joint is provided with a water-stop copper sheet and caulking material.

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