Construction method and structure of poured anti-seepage core earth-rock dam

Abstract

The invention discloses a construction method and structure of a poured anti-seepage core earth-rock dam. The method comprises an underwater dam body filling and dam foundation treatment method, a poured anti-seepage core wall formation method, and a dam material selection and control method. The dam structure is divided into an upper dam body, a lower dam body and an anti-seepage system. The lower dam body is directly completed by vibrating and densifying the underwater dumping and filling dam material. The upper dam body is completed by layered compaction of sand gravel, soft rock, gravel soil, weathered materials and excavation slag in a reservoir area, and compaction control is carried out by a comprehensive method of test, calculation and analysis, filling indicators and constructionparameters. The anti-seepage system is composed of the connection of anti-seepage core walls formed in the dam bodies and overburden through a pulsating grouting technology and a bedrock curtain. Themethod and structure expands the application scope of earth-rock dams, direct underwater dumping and filling construction is achieved, the construction period is effectively shortened, cofferdam filling, weir seepage prevention, foundation pit excavation, foundation pit pumping are saved, and material yard, slag yard land acquisition and related water conservation and environmental protection measures are saved.

Description

technical field [0001] The invention relates to a construction method and structure of a perfusion anti-seepage core earth-rock dam, which belongs to the technical field of water conservancy and hydropower engineering. Background technique [0002] As one of the oldest dam types, earth-rock dams are widely used in water conservancy and hydropower projects. With the development of economy and society, the protection of ecological environment is becoming more and more important. The traditional earth-rock dam structure highlights the following problems: [0003] First of all, the compaction (cohesive soil), relative density (gravel) or porosity (rockfill) of the traditional earth-rock dam body filling is the only design control index, which requires high dam materials, and the use of cohesive soil materials is relatively low. If there are many, it is necessary to find a material yard with huge reserves and set up a spoil yard, which will occupy a large amount of cultivated la...

AI Technical Summary

Problems solved by technology

[0010] The above technologies have their own advantages, and some innovative schemes have been proposed for the anti-seepage core wall technology of earth-rock dams. Most of these schemes involve the anti-seepage body of the core wall composed of clay or asphalt. There is no suitable material yard at the dam site, and long-distance transportation will not only occupy a large amount of cultivated land, forest land and other resources, but also pay a large economic and environmental price

For the asphalt concrete anti-seepage body, the foundation has high requirements on geological conditions, and special asphalt concrete mixing facilities are required, the construction period is long and the investment is large

The geomembrane is easy to tear, so it is usually used in temporary projects, and the scope of application is narrow

And the disadvantage of CN106522170A is that the concrete core wall is easily deformed and damaged, and transition materials need to be added around, and the cost is higher

[0011] Therefore, the existing structural types and construction techniques of earth-rock dams do not meet the needs of the current social and economic development for ecological environment and engineering construction efficiency, and need to be further optimized and developed.

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