摘要
三峡二期围堰防渗墙最大高度 74m ,墙厚 0 .8～ 1.1m ,防渗总面积 83450m2 .其中墙深大于 4 0m ,采用塑性混凝土 ,成墙最高月强度达 11188m2 。防渗墙经 1998年夏季长江 8次洪峰 (三峡坝址最大流量 6 10 0 0m3/s)考验 ,堰体渗透比降最大值 0 .10 8,小于堰基粉细砂设计允许值 0 .2 5;渗水总量约50L/s ,小于设计估算基坑渗水总量 6 0 0L/s ,防渗效果显著 .
The cut off wall of the second stage cofferdams of the Three Gorges Project has a maximum height of 74?m, a thickness of 0 8～1 1?m,and a total seepage proof area of 83?450?m 2 . Among others,plastic concrete is adopted for wall depth greater than 40?m.The maximum wall construction intensity reached 11188?m 2 per month. The cut off wall underwent 8 flood peaks of the Yangtze river in the summer of 1998,the maximum discharge at the Three Gorges Dam site being 61000?m 3/s.The maximum percolation gradient of the cofferdams was 0 108,smaller than the minimum allowable value 0 25 of silty fine sand on the base of the cofferdams.The total seepage discharge was about 50?L/s, smaller than the design seepage discharge through the foundation pits 600?L/s. The result of seepage prevention is significant.
出处
《水利水电科技进展》
CSCD
2000年第5期47-49,共3页
Advances in Science and Technology of Water Resources
关键词
围堰
防渗墙
塑性混凝土
配合比
槽段
cofferdams
cut off wall
plastic concrete
mix proportion
groove segment
Three Gorges Project
