Clay core wall dam structure and construction method thereof

Abstract

The invention provides a clay core wall dam structure and a construction method thereof. The clay core wall dam structure comprises a foundation pit, wherein the foundation pit is deep to bedrock, a grouting gallery is arranged at the bottom of the foundation pit, and curtain grout is arranged at the bottom of the grouting gallery; a seepage prevention wall is arranged between the grouting galleryand a clay core wall, a water stop structure is arranged between the seepage prevention wall and the grouting gallery, the foundation pit is filled with rockfill in a backfilling mode, and the elevation of the seepage prevention wall is higher than that of a rockfill backfilling area; the clay core wall is built above the rockfill backfilling area, and the bottom of the clay core wall is connected with the seepage prevention wall; and rockfill structures of a dam are arranged outside the water-facing side and the backwater side of the clay core wall, and the rockfill structures of the dam arepiled on the foundation pit rockfill backfill area. According to the clay core wall dam structure and the construction method thereof, the rockfill material is backfilled in the deep foundation pit,the concrete seepage prevention wall is arranged for preventing seepage, the clay core wall dam is arranged at the upper part of the rockfill, the construction of the rockfill backfilled in the deep foundation pit is not limited by rainy seasons, the construction progress can be accelerated, and the problem of flood control in rainy seasons of the deep foundation pit is solved.

Description

technical field [0001] The invention relates to a clay core wall dam structure and a construction method thereof, which are mainly suitable for dam structures built in rainy areas and areas with deep and thick soft soil strata. Background technique [0002] In hydropower and water conservancy projects, due to the limitation of terrain and geological conditions, some dam structures need to be built in areas where soft soil stratum develops, and some of them will use clay core wall dams. The soft soil layer has poor bearing capacity and shear resistance, and some projects adopt the method of excavating the soft soil layer and placing the core wall on the bedrock. However, the rainy season is long in rainy areas, and the clay core wall cannot be constructed during the rainy season, which restricts the entire construction period. At the same time, it is difficult to protect deep foundation pits in soft soil stratum, and it is difficult to flood in the rainy season, so the safet...

AI Technical Summary

Problems solved by technology

However, the rainy season is long in rainy areas, and the clay core wall cannot be constructed during the rainy season, which restricts the entire construction period

At the same time, it is difficult to protect deep foundation pits in soft soil strata, and it is difficult to flood in the rainy season, and the safety risk of deep foundation pits is great.

Images