Concrete dam and earth and rockfill dam mixed dam type structure and construction method

Abstract

The invention relates to a concrete dam and earth and rockfill dam mixed dam type structure and a construction method. The concrete dam and earth and rockfill dam mixed dam type structure and the construction method aim at reducing large-area excavation on a slide rock body of a bank slope, avoiding transportation of large-space excavation materials, accordingly reducing scales of abandoned dreg areas, greatly reducing engineering investment, effectively protecting the ecological environment and embodying the good economy and the good environmental protection property. According to the technical scheme, the structure comprises a concrete dam section and an earth and rockfill dam section; the concrete dam section comprises a concrete dam body and a foundation curtain grouting gallery at the bottom of the concrete dam body; the earth and rockfill dam section comprises a clay core wall and core wall rockfill dams on the two sides of the clay core wall; a transition area is arranged at the joint of the concrete dam section and the earth and rockfill dam section; fan-shaped enrockment areas are distributed on the two sides of the joint; the gradient of the portion, close to the earth and rockfill dam section, of the transition area is 1:N, wherein N ranges from 1 to 2; the gradient of the sides, close to the concrete dam section, of the fan-shaped enrockment areas is 1:K, wherein K ranges from 1.8 to 2.5; and foundation grouting curtains are arranged in the foundation curtain grouting gallery and the clay core wall respectively.

Description

1. Technical field [0001] The invention relates to a mixed dam structure and a construction method of a concrete dam and an earth-rock dam, and is mainly applicable to similar projects such as the structure layout of water-retaining buildings with large differences in geological conditions of river beds and bank slopes. 2. Background technology [0002] In water conservancy and hydropower projects, due to the limitation of geological conditions, the depth of the riverbed overburden in the selected dam site area is often small, the buried depth of fresh rock is relatively shallow, and the thickness of bank slope deposits is relatively large; such complex geological conditions , making it more difficult to choose the dam type and hub layout: if the earth-rock dam type is selected, there will be difficulties in the design of the flood discharge and energy dissipation structure; if the concrete dam type is selected, the excavation and support of the bank slope deposit will be dif...

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Problems solved by technology

[0002] In water conservancy and hydropower projects, due to the limitation of geological conditions, the depth of the riverbed overburden in the selected dam site area is often small, the buried depth of fresh rock is relatively shallow, and the thickness of bank slope deposits is relatively large; such complex geological conditions , making it more difficult to choose the dam type and hub layout: if the earth-rock dam type is selected, there will be difficulties in the design of the flood discharge and energy dissipation structure; if the concrete dam type is selected, the excavation and support of the bank slope deposit will be difficult will bring huge engineering investment

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