Sand drain for accelerating core-wall drainage consolidation of core-wall rockfill dam

Abstract

The invention discloses a sand drain for accelerating core-wall drainage consolidation of a core-wall rockfill dam. The sand drain is embedded into a core wall and comprises sand-gravel materials, geotextile bags, a drainage gallery and an opening and closing valve. The geotextile bags wrap the sand-gravel materials with good water permeability and are stacked into the sand drain. The drainage gallery is arranged on a dam foundation. The bottom of the sand drain and the drainage gallery are connected through the opening and closing valve. By means of the sand drain, water drainage seepage paths of core-wall inner pores can be shortened, and water not only can be drained through the two sides of the core wall but also can be drained through the sand drain; and meanwhile, the effect that clay fine particles in the core wall cannot be drained together with pore water can be guaranteed due to the geotextile bags with anti-filtering characteristics, and therefore the drainage consolidation process is accelerated, core-wall soil mass can achieve expected strength for further filling as early as possible, and the filling construction period of the core wall is shortened.

Description

technical field [0001] The invention belongs to the technical field of drainage and consolidation of core rockfill dams, in particular to a sand well for accelerating drainage and consolidation of core walls of rockfill dams. Background technique [0002] my country currently has more than 98,000 dams, including nearly 90,000 earth-rock dams. Earth-rock dam generally refers to a type of dam that is piled up by local soil, stone or mixed materials through casting, rolling and other methods. The earth-rock dam uses local materials, which reduces the transportation cost of building materials; the structure is simple, which is convenient for maintenance and heightening; the construction technology is simple, and it is convenient for rapid mechanical construction. With these advantages, earth-rock dams still have great application prospects in the future. [0003] The core wall rockfill dam is a form of earth-rockfill dam. The filling material inside the dam shell and dam body ...

AI Technical Summary

Problems solved by technology

The fast consolidation of the core wall is beneficial to the stability of the core wall and prevents the occurrence of hydraulic splitting, but the seepage diameter of the pore water discharge is long, the consolidation process is slow, and it takes too long to achieve complete consolidation, which in turn limits The filling of the core wall slows down the overall construction process and is not conducive to the stability of the core wall

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