Impermeable drainage system for cement-sand-gravel dam

Abstract

The invention provides an impermeable drainage system for a cement-sand-gravel dam. The impermeable drainage system is provided with an upstream impermeable layer and a drainage layer, wherein the upstream impermeable layer is arranged on the upstream of the cement-sand-gravel dam and covers the whole upstream dam face in a laminating manner, the upstream impermeable layer is cut into a pluralityof blocks by transverse seams in the axis direction of the dam, water-stop structures are arranged at the transverse seam positions, at least one part of each water-stop structure is arranged on the surface of the upstream impermeable layer, the upstream impermeable layer is made of slurry-adding vibrating cement sand gravels or slurry enriching cement sand gravels, the drainage layer is arrangedon the downstream side of the upstream impermeable layer of the cement-sand-gravel dam and is adjacent to the upstream impermeable layer, and drainage pipes are arranged on the downstream side of thedrainage layer in the axis direction of the dam and drain leakage water penetrating the upstream impermeable layer. According to the impermeable drainage system, the cement-sand-gravel dam is more economical and environmentally friendly, and meets higher engineering design requirements for compressive strength larger than 20 MPa, anti-freeze strength meeting F300 and impervious strength larger than W10, construction is convenient and fast, the dam body impermeable effect and the dam inner drainage effect can be improved effectively, and the design method of the cement-sand-gravel dam is perfected.

Description

technical field [0001] The invention relates to an anti-seepage and drainage system of a cemented sand and gravel dam, in particular to a complete set of dam body anti-seepage and internal drainage system for a cemented sand and gravel dam in the field of water conservancy and hydropower engineering. Background technique [0002] Cemented sand and gravel dam construction technology can make full use of local materials, and adjust the dam structure and partitions according to different material characteristics to meet the requirements of dam construction. It has the advantages of economy, safety, fast construction, and environmental protection. Pay attention to. At present, many temporary and permanent projects such as cemented sand and gravel cofferdams in my country have adopted cemented sand and gravel technology. This technology has excellent promotional value. However, to promote this technology, one of its own weaknesses needs to be solved: compared with normal concre...

AI Technical Summary

Problems solved by technology

However, the strength of cemented sand and gravel is low, and the normal concrete anti-seepage layer or concrete panel is used for anti-seepage, and there is a problem of large stress gradient at the joint part and possible detachment.

At the same time, the water stop embedded in the anti-seepage body is inconvenient in construction and complicated in maintenance. It is not suitable to find the specific location when it is damaged.

Of course, in order to avoid this problem, the anti-seepage of cemented sand and gravel dams can also learn from the anti-seepage technology of rockfill dams, using geomembrane anti-seepage, but this anti-seepage technology has problems such as difficult control of construction quality and difficult repair of damage

At the same time, the cemented sand and gravel dam using the above-mentioned traditional anti-seepage form has disadvantages such as high engineering cost, environmental damage, poor durability, and slow construction progress.

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