Mixed dam type structure with homogeneous earth and rockfill dam and concrete faced rockfill dam and construction method

Abstract

The invention relates to a mixed dam type structure with a homogeneous earth and rockfill dam and a concrete faced rockfill dam and a construction method. The mixed dam type structure with the homogeneous earth and rockfill dam and the concrete faced rockfill dam is simple in structural design, convenient to construct, safe and reliable, and has good economy and high practicability. According to the technical scheme, the structure is provided with the original homogeneous earth and rockfill dam and the concrete faced rockfill dam, wherein unconsolidated soil with a certain thickness is excavated out from the top of the original homogeneous earth and rockfill dam; the concrete faced rockfill dam is arranged on a downstream side of the original homogeneous earth and rockfill dam and consists of a main rockfill zone, a secondary rockfill zone, a transition layer, a concrete faced bottom cushion layer and a concrete face; the transition layer, the concrete faced bottom cushion layer and the concrete face are successively paved on parts, which are close to a slope of the top side of the original homogeneous earth and rockfill dam, of the rockfill zones; a filter material layer and a transition material layer are successively arranged between the homogeneous earth and rockfill dam and the main rockfill zone; a consolidation grouting layer, a concrete slab and a toe board which is in lap joint with the bottom of the concrete face are successively arranged on the top of the original homogeneous earth and rockfill dam from bottom to top; a geomembrane covers the top of the toe board; a homogeneous earth and rockfill dam diaphragm wall which penetrates into bed rock is vertically arranged in the original homogeneous earth and rockfill dam; the top of the diaphragm wall penetrates through the toe board; and the bottom of the diaphragm wall is connected with a grouting curtain.

Description

technical field [0001] The invention relates to a mixed dam structure and a construction method of a homogeneous earth-rockfill dam and a face-face rockfill dam, and is mainly suitable for similar projects such as reconstruction and expansion of a homogeneous earth-rockfill dam or a clay core rockfill dam. Background technique [0002] The dam body section of a homogeneous earth-rock dam does not distinguish between the anti-seepage body and the dam shell, and is basically formed by rolling and filling uniform cohesive soil materials (loam, sandy loam). Due to the simple structure of the dam and the convenience of construction, a batch of medium-low homogeneous earth-rock dams have been built in my country since the 1960s. With the progress of society and the rapid development of water conservancy and hydropower projects, the low-medium homogeneous earth-rock dams built in the early stage can no longer meet the needs of the society, and need to be renovated and expanded. ...

AI Technical Summary

Problems solved by technology

With the progress of society and the rapid development of water conservancy and hydropower projects, the low-medium homogeneous earth-rock dams built in the early stage can no longer meet the needs of the society, and need to be renovated and expanded

[0003] At present, according to the experience of many projects in our country, the previous homogeneous earth-rock dam is often excavated or used as the construction cofferdam of the expansion project in the process of reconstruction and expansion, basically giving up the secondary utilization of the homogeneous earth-rock dam , discarding the soil material with excellent anti-seepage performance in the homogeneous earth-rock dam that has been consolidated and deformed, resulting in a great waste of resources

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