Study on Seepage Control for Longtan RCC Gravity Dam

This paper discusses systematically the necessity of seepage analysis and seepage control study for high RCC gravity dam,recommends the seepage characteristics of material for different zones of Longtan RCC dam and studies the seepage dissolving character and critical hydraulic gradient.It proves that optimal concrete mix can meet the requirements for both seepage control and durability of 192m/216.5m high dam.For seepage control structures,this paper focuses on the reinforced concrete facing,the anomalous concrete with two grade concrete facing and the bituminous mix facing.Based on temperature control,crack control structural stress and stability analysis as well as dam seepage calculation,the anomalous concrete with two grade conerete facing is optimal and is recommended.Bituminous mix possesses good seepage control and,heat insulation property which is very good for temperature and crack control,therefore it is suggested as a comparable one.This paper,which suggests some topics for further research is doubtlessly important for the Longtan project now under construction