Upstream surface structure of concrete face rockfill dam for preventing face from disengagement and construction method thereof

Abstract

The invention discloses an upstream surface structure of a concrete face rockfill dam for preventing a face from disengagement and a construction method thereof. The structure comprises a concrete face, a concrete toe board, an extrusion side wall and a wave wall, wherein the extrusion side wall is tightly attached to the lower side of the concrete face; the wave wall is positioned at the tops of the concrete face and the extrusion side wall; the concrete toe board is positioned at the bottom of the concrete face and is connected with a foundation; a plurality of grooves are formed in parallel at intervals along the slope surface direction of the surface of the extrusion side wall; a backfill grouting pipe is embedded into each groove; an anti-blocking protection film is paved on the surface of each backfill grouting pipe. Disengagement grouting treatment is carried out through the grouting pipes which are embedded in advance, self-flow type grouting is adopted, the structure is forward-looking and has a prevention function, and the face cannot be damaged; by embedding the grouting pipes at the bottom of each face, requirements on grouting treatment for the disengagement of each part of the face are met, and disengagement grouting treatment can be carried out in different time periods and for different times.

Description

technical field [0001] The invention belongs to the technical field of concrete face rockfill dam construction in water conservancy and hydropower projects, and in particular relates to an upstream surface structure and a construction method of a concrete face dam for preventing face voids. Background technique [0002] Due to the structure and dam construction materials of concrete face rockfill dams, it is very likely that there will be voids between the concrete face and rockfill body. Most of the built high face rockfill dams have experienced face voids. A large area is void, and the panel is easy to break or have horizontal cracks under the action of reservoir water pressure, which will endanger the safe operation of the reservoir dam. [0003] At present, the problem of panel voids is often analyzed according to panel void monitoring data or observed with the naked eye. When voids are found in the panels, holes are punched in the panels or grouting is performed on the ...

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Problems solved by technology

In this way, it not only increases the difficulty of processing and the amount of processing engineering, but also reduces the water supply or power generation benefits of the reservoir.

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