Face rockfill dam seepage prevention structure

Abstract

The invention provides a face rockfill dam seepage prevention structure. The face rockfill dam seepage prevention structure comprises a bed rock and a toe plate located on the bed rock. A seepage prevention layer flush with the toe plate is mounted on the downstream side of the toe plate, a rockfill material, a transition layer, a cushion material, a geomembrane and a face plate are sequentially mounted upwards from the seepage prevention layer, a construction face is mounted on the side face, facing the downstream part, of the toe plate, and the face plate, the geomembrane, the cushion material, the transition material, the rockfill material and the seepage prevention layer are in contact with the construction face. Compared with the related technology, the face rockfill dam seepage prevention structure combines advantages of a concrete face rockfill dam and a geomembrane face rockfill dam, the face plate, the geomembrane, a water stop copper sheet, the toe plate, the seepage prevention layer, a seepage prevention curtain and the bed rock form a whole seepage prevention system, whole stress performance is improved, and the dam water stop effect is ensured.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, in particular to an anti-seepage structure of a face rockfill dam. Background technique [0002] The anti-seepage structure of the prior art face rockfill dam generally includes a plinth, an anti-seepage layer located on the downstream side of the plinth, rockfill material, and a face plate from upstream to downstream. In recent years, due to its good anti-seepage performance and strong adaptability to deformation, geomembrane has gradually been widely used to form geomembrane face rockfill dams. That is to say, it uses flexible geomembrane instead of the panel as the anti-seepage layer, and has achieved certain results. The anti-seepage structure of the geomembrane replacement panel usually includes an upper protective layer, a geomembrane, a lower support layer (usually an extruded side wall is used as the support layer), and a rockfill material. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] 1) For concrete face rockfill dams, due to the discontinuous deformation between the cushion material and the face plate, it is easy to form contact and separation between the face plate and the cushion material, which is commonly referred to as the void phenomenon. Deformation occurs, forming a pot-bottom shape downstream in space, and the panel loses the supporting layer at the empty part, which is prone to local damage or even panel fracture. Once the panel is damaged, it will have a serious impact on the anti-seepage, and even endanger large Dam safety, domestic and foreign concrete rockfill dams occasionally face face damage

[0005] 2) For concrete face rockfill dams, under the action of self-weight, the dam body (cushion materials, transition materials, and rockfill materials) deforms from both banks to the valley, and at the same time drives the deformation of the panels on both banks to the middle of the valley, making the slab located in the middle of the valley deform greatly. Extrusion stress, prone to local extrusion damage at the joints between face panels, thus affecting the anti-seepage function of face panels, this phenomenon often occurs in face dams

[0007] 4) For geomembrane face rockfill dams, when the water level drops suddenly, the water in the reservoir drops rapidly, while the water in the rockfill material drops slowly, which will cause the internal water level of the dam body to be high and the reservoir water level to be low, and the geomembrane will be affected by the water level difference. Under the action, it is easy to break away from the downstream cushion area, and the jacking phenomenon occurs

[0008] 5) For geomembrane face rockfill dams, the geomembrane is directly placed on the surface. Under the action of wind, sun, rain, and water immersion, it is prone to aging, punctured by floating objects, and freezing and cracking in cold regions.

[0009] 6) Regardless of whether it is a face rockfill dam or a geomembrane face rockfill dam, once leakage occurs, it will be inconvenient to operate and maintain, and it will seriously endanger the safety of the dam and increase the operating cost

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