Study on dam type comparison and dam foundation treatment scheme of Beikeng Reservoir Dam

Abstract

The dam site of Beikeng Reservoir is asymmetric wide valley terrain, the lithology is tuff, the rock is hard, and the overburden on the left bank is relatively deep. Compared with the gravity dam, the local material dam has strong adaptability to topographic and geological conditions, better material source conditions and less investment. Considering that the construction period of the weathered material core wall rockfill dam is long, and it has certain interference with the adjacent spillway, the recommended dam type is the face rockfill dam. Aiming at the problem of deep overburden layer of dam foundation, considering the scheme of ‘retaining part of the overburden layer + vibroflotation gravel pile', the risk of deformation and cracking of the dam panel is relatively large, the construction is difficult, the construction period is long, and the project investment is large. Therefore, the dam foundation adopts the treatment scheme of ‘all excavation of the overburden layer'.

Keywords

dam type selection / face rockfill dam / weathered material core wall rockfill dam / vibroflotation gravel pile / excavate the covering layer