摘要
Abstract
The upstream cofferdam of a large-scale water conservancy project adopts plastic concrete cut-off wall with geomembrane and clay on both sides to prevent seepage.During the impoundment of the reservoir,the seepage volume of the foundation pit suddenly increases to 3400 m3/h,which needs further anti-seepage treatment.According to the structural characteristics of the cofferdam and the characteristics of the stratum,through the combination and mutual verification of new exploration drilling,geophysical exploration,on-site inspection,and grouting hole connectivity test,the leakage site is quickly and accurately determined,and the anti-seepage treatment schemes such as underwater grouting mortar,paste slurry(quick-setting paste slurry),chemical slurry and double liquid are proposed.The large leakage hole section is treated by grouting paste slurry(quick-setting paste slurry),chemical grouting,cement slurry and water glass double liquid plugging grouting.The results show that the anti-seepage scheme adopted has good plugging effect.The engineering experience can provide reference for similar projects.关键词
高水头/土石围堰/深层渗漏/化学灌浆/防渗处理Key words
high head/earth-rockfill cofferdam/deep percolation/chemical grouting/anti-seepage treatment分类
水利科学
