High rock-fill dam membrane anti-seepage body on deep coverage layer and construction method of high rock-fill dam membrane anti-seepage body

Abstract

The invention discloses a high rock-fill dam membrane anti-seepage body on a deep coverage layer and a construction method of the high rock-fill dam membrane anti-seepage body. The membrane anti-seepage body is composed of a concrete protection layer, a geomembrane anti-seepage layer, a flexibility cushion layer and a transition layer. The concrete protection layer is a cast-in-place fiber concrete layer for a reserved cross joint and a vertical joint and located on a surface layer to protect a geomembrane. The geomembrane anti-seepage layer is a two-cloth and one-membrane composite geomembrane and is located in the middle to play a role of preventing seepage. The flexibility cushion layer is a polyurethane pervious concrete layer and located at the bottom of the anti-seepage body to support the geomembrane and to transmit and disperse water loads. The rough granule transition layer is arranged between the flexibility cushion layer and a rock-fill dam body. The construction method comprises the technical steps of filling and building the transition layer, pouring the flexibility cushion layer, paving the composite geomembrane, pouring the concrete protection layer and the like. The membrane anti-seepage body can keep stable on a high rock-fill dam slope, the ability of adapting to deformation of a coverage layer dam foundation and the dam body is high, the structural form is simple, construction is fast, and the anti-seepage problem of the high rock-fill dam on the deep coverage layer can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, and relates to a rockfill dam anti-seepage body and a construction method thereof, in particular to a high rockfill dam film anti-seepage body on a deep covering layer and a construction method thereof. Background technique [0002] Southwest my country is rich in hydropower resources, but with the in-depth implementation of the western development strategy and the rapid advancement of water conservancy and hydropower development, there are fewer and fewer good dam sites with good geological conditions, and the dam site areas involving deep riverbed overburden more and more. The rockfill dam has the advantages of making full use of local natural materials, strong adaptability to dam site conditions, small amount of excavation of the dam foundation cover layer, and convenient construction, so it has become the optimal dam type that can be built on deep cover lay...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiency that the above-mentioned existing rockfill dam anti-seepage body cannot effectively solve the problem of high rockfill anti-seepage on the deep overburden layer, and propose a kind of anti-seepage body of high rockfill dam film on the deep overburden layer and its construction method , the anti-seepage body can adapt to the large deformation and differential deformation of the high rockfill dam body with steep dam slope on the deep cover layer, and the structure type is simple and the construction is convenient

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