Concrete faced rockfill dam on deep covering layer and construction method

Abstract

The invention discloses a concrete faced rockfill dam on a deep covering layer and a construction method, and belongs to the technical field of a water conservancy project. The concrete faced rockfill dam comprises a dam body and a covering plate, wherein the dam body is arranged on the covering layer, a transition layer is arranged at the upstream side of the dam body, a reversed filter is arranged on the transition layer and is provided with a panel and the bottom end of the panel is arranged on the covering layer through a connecting plate; a diaphragm wall and a gravel pile are vertically arranged inside the covering plate, the top end of the diaphragm wall is connected with the connecting plate and an upstream weight is arranged above the connecting plate. The invention discloses a construction method of the structure. According to the concrete faced rockfill dam on the deep covering layer provided by the invention, on the on hand, the strength of the covering layer of the dam body can be improved; on the other hand, the pore water pressure in the covering layer at the lower part of a dam foundation can be quickly reduced under the seismic oscillation effect, the strength of the soil body cannot be significantly reduced, and the normal operation of the dam body can be ensured; in addition, the construction method provided by the invention is simple to use and lower in cost, and is likely to be constructed.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a face rockfill dam with a deep covering layer and a construction method thereof. Background technique [0002] Face rockfill dam is a kind of rockfill dam with rockfill body as supporting structure, and concrete face is set on its upstream surface as anti-seepage structure, which belongs to the category of earth-rockfill dam. The development of concrete face rockfill dams has roughly gone through three stages: the early stage characterized by throwing and filling rockfill, and the dam height is generally less than 100m; the transitional stage characterized by rolling; the modern stage characterized by rolling, the dam The number and height of dams have been rapidly developed, and gradually become one of the mainstream dam types in water conservancy and hydropower engineering construction. The highest reinforced concrete face rockfill dam in the...

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Problems solved by technology

[0003] The following solutions are adopted in the prior art: 1) The construction methods of face rockfill dams are adopted. These methods are mainly suitable for working conditions with thin overburden layers. For dams built on deep overburden layers, the construction quality and dam body are stable. 2) The construction plan of the face rockfill dam with two cut-off walls is suitable for the overburden thickness greater than 50m. However, it failed to consider the influence of the strength reduction of the covering layer on the upper dam body under earthquake conditions, especially when there is a liquefiable soil layer in the covering layer, it is difficult to ensure the overall stability of the dam body

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