Construction method for drainage structure of dam body of homogeneous earth dam

Abstract

The invention discloses a construction method for a drainage structure of a dam body of a homogeneous earth dam. The drainage structure is composed of a vertical drainage body, one or more horizontaldrainage cushion layers and drainage ridge bodies, wherein the vertical drainage body, the horizontal drainage cushion layers and the drainage ridge bodies are sequentially connected. The vertical drainage body is formed in the downstream side of an anti-seepage curtain of a dam foundation inside the dam body of the homogeneous earth dam in the direction along the dam axis to drain seepage water to the bottom of the vertical drainage body, wherein the horizontal width of the vertical drainage body ranges from 1 m to 3 m. The drainage ridge bodies are arranged at the downstream end. The one ormore horizontal drainage cushion layers are arranged between the vertical drainage body and the downstream drainage ridge bodies to serve as connection channels between the vertical drainage body andthe drainage ridge bodies. By means of the method, the height of a seepage line of the dam body and the seepage pressure can be reduced; anti-sliding stability of a dam slope at the downstream of thedam body is improved, and thus the gradient of the downstream dam slope is increased to a proper extent; the filling work amount is reduced; the cost is low; construction is convenient to conduct; inaddition, seepage can be remarkably reduced, the specification requirements are met; and furthermore, the project construction cost can be saved, and the construction period is shortened.

Description

technical field [0001] The invention relates to a construction method for a drainage structure of a homogeneous earth dam used in industries such as water conservancy, hydropower, and mining. Background technique [0002] Homogeneous earth dam is an ancient hydraulic structure. Its cross-section is basically filled with a single material that is relatively uniform and has a small permeability coefficient, regardless of the anti-seepage body and the dam shell. The entire dam body is an anti-seepage body, and its structure has a relatively long contact seepage diameter with the dam foundation, bank slope and concrete buildings, which can simplify or even cancel anti-seepage treatment. It has the characteristics of single filling material, simple process, less interference between processes, low requirements on geological conditions, and low cost. It is often the first choice for engineering design when the conditions are met. However, because soil filling is greatly affected ...

AI Technical Summary

Problems solved by technology

In view of the fact that after the filling is rolled, the water permeability along the horizontal direction between the layers is often greater than that in the vertical direction, even if the drainage soak line of the mattress is set, it still cannot drop rapidly, and it cannot ensure that the downstream dam body (slope) is in a dry state (the soak line and the bottom mattress pad or prism intersect)

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