Face plate rock-fill dam structure of reasonably utilizing sand gravel material and construction method thereof

Abstract

The invention relates to a face plate rock-fill dam structure of reasonably utilizing sand gravel material and a construction method thereof. The invention aims at providing a face plate rock-fill damstructure of reasonably utilizing sand gravel material and a construction method thereof; a sand gravel material near a dam site is put in a drying area of the middle part of a dam body so as to avoid additionally open up a rock-fill material field and protect the biological environment. The face plate rock-fill dam structure of reasonably utilizing sand gravel material is provided with a dam main body; the upstream side of the dam main body is sequentially laid with a transition layer, a cushion layer and a face plate from inside to outside; a special cushion layer is arranged below the cushion layer; a dam base of the upstream side of the main body is provided with a rock ballast backfill area and a silt backfill area, the downstream side of the main body is provided with a dry stone pitching, and a downstream dam base is provided with an oversize stone pressing stone area; and the main body comprises a main rock-fill area and a secondary rock-fill area, a sand gravel area positioned above a seepage line is arranged in a hollow cavity surrounded by both the main rock-fill area and the secondary rock-fill area, and the bottom part of the sand gravel area and the low altitude position of a downstream surface are provided with inverted filter protection layers. The invention is used in face plate dam engineering of the natural sand gravel material near the dam site.

Description

technical field [0001] The invention relates to a face rockfill dam structure and a construction method for rationally utilizing sand and gravel materials. It is mainly suitable for concrete face dams and asphalt concrete face dam projects with natural sand and gravel sources near the dam site. Background technique [0002] The concrete face rockfill dam is one of the mainstream dam types in current water conservancy and hydropower projects. Under the premise of satisfying the basic principles of hydraulic transition, the dam body material partition forms are flexible and diverse. In actual engineering, sand and gravel are placed in the upstream, middle, and downstream of the dam body. However, due to the poor seepage stability of sand and gravel, it is often necessary to set up a separate drainage area, which will cause certain problems to the construction progress and difficulty. At the same time, due to the low shear strength of sand and gravel materials under low confin...

AI Technical Summary

Problems solved by technology

In actual engineering, sand and gravel are placed in the upstream, middle, and downstream of the dam body. However, due to the poor seepage stability of sand and gravel, it is often necessary to set up a separate drainage area, which will cause certain problems to the construction progress and difficulty. At the same time, due to the low shear strength of sand and gravel materials under low confining pressure conditions, it is necessary to slow down the dam slope when placed upstream and downstream, increasing the filling volume of the dam body and project investment

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