Artificial composite foundation of concrete face rockfill dam built on deep and thick coverage layer and construction method of artificial composite foundation

Abstract

The invention discloses an artificial composite foundation of a concrete face rockfill dam built on a deep and thick coverage layer. The artificial composite foundation comprises a primary rockfill region (1) and a secondary rockfill region (2) which are arranged on the coverage layer (5), wherein a concrete cover board (4) is arranged below the primary rockfill region (1); a grout solidification region (7) is positioned between the concrete cover board (4) and base rock (6); an anti-seepage wall construction passageway (9) and a grout passageway (10) are arranged in the concrete cover board (4); a concrete anti-seepage wall (8) is arranged below the anti-seepage wall construction passageway (9), penetrates through the coverage layer (5) and reaches the base rock (6); and the thickness of the coverage layer (5) is more than 50 meters. By the technical scheme, the coverage layer does not need to be completely removed, so that a series of negative influences such as large excavation work amount, increase of scale of flow guide engineering, increase of scale of a slag abandoning field and delay of the working period of engineering construction are eliminated. The invention also discloses a construction method of the artificial composite foundation.

Description

technical field [0001] The invention belongs to the technical field of face rockfill dam construction in water conservancy and hydropower projects, more specifically it is an artificial composite foundation for building a face rockfill dam on a deep covering layer, and relates to a deep covering layer of a face rockfill dam foundation (dam foundation covering layer thickness exceeding 50m). The invention also relates to the construction method of the artificial composite foundation. Background technique [0002] Concrete face rockfill dam is a dam type widely used in domestic and foreign water conservancy and hydropower projects. With the development of hydropower projects in Southwest my country, which is rich in water energy resources, it involves the construction of high face rockfill dams on deep overburden. More and more, and the scale is getting bigger and bigger. The utilization and treatment of the deep overburden of the riverbed (the thickness of the overburden of ...

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Problems solved by technology

The problems faced by building concrete face rockfill dams on deep overburden layers are more complicated than those on bedrock. Under the action of dam filling load and water pressure, the overburden layer will produce large settlement and uneven settlement. As the depth of the overburden layer and the scale of the dam body increase, problems such as uncoordinated deformation of the dam body, uncoordinated deformation between the face plate and the dam body, and poor stress-deformation properties of the cut-off wall become more prominent, which will easily lead to excessive deformation of the dam body, voiding of the face plate, Cracks in the face plate, water-stop failure, etc., even lead to breakage of the face plate, cut-off wall, connecting plate, a large amount of water leakage and seepage of the dam foundation, causing seepage damage to the dam body and dam foundation, affecting the safe operation of the dam

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