白鹤滩水电站大坝上游高土石围堰设计

摘要

白鹤滩水电站上游围堰高83 m,采用复合土工膜斜墙+塑性混凝土防渗墙的防渗形式,土工膜挡水水头40.58 m,防渗墙最大深度56 m.通过渗流及稳定分析,以及两个汛期的考验表明,围堰运行情况良好,上、下游边坡稳定安全,为大坝浇筑、水垫塘等基坑内工作面正常施工提供了保障.%The upstream cofferdam of Baihetan Hydropower Station is 83 m high.The seepage prevention system is composed of geomembrane inclined wall and plastic concrete anti-seepage wall.The retaining head of geomembrane is 40.58 m and the maximum depth of concrete anti-seepage wall is 56 m.The seepage and stability analysis and the actual operation in two flood seasons show that the cofferdam is in good condition and the upstream and downstream slopes are stable,which provides a guarantee for normal dam pouring and plunge pool constructing in foundation pit.