深厚覆盖层上土石围堰渗流及边坡稳定性研究  

Study on seepage and slope stability of earth-rock cofferdam on deep overburden foundation

作　　者：卢晓春[1] 田斌[1] 孙开畅[1] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《人民长江》2014年第9期55-58,61,共5页Yangtze River

基　　金：国家自然科学基金资助项目(51279090);国家"十一五"科技支撑计划项目(2008BAB29B02)

摘　　要：乌东德水电站上游土石围堰填筑于60 m厚的覆盖层上,堰体及基坑开挖后形成了高达150 m的复合边坡。针对围堰采用的塑性混凝土防渗墙上接复合土工膜的防渗型式,采用有限单元法对其正常运行条件和局部破损情况下的渗流场进行了计算分析,并采用非线性强度参数对各运行条件下的上下游边坡稳定性进行了复核。研究表明,采用塑性混凝土防渗墙上接复合土工膜的防渗方案是合理的,其防渗效果显著;在各工况下围堰边坡稳定性满足规范要求,围堰断面的安全性可以得到保障。The upstream cofferdam of Wudongde Hydroelectric Station is built on foundation with 60m overburden layer,thus a 150m high artificial slope consisted of cofferdam slope and foundation pit is formed. The seepage control system of cofferdam is constituted by plastic concrete cutoff wall and composite geomembrane. The seepage filed under normal operating condition and partial breakage condition is analyzed by finite element method,and the slope stability under various cases is reviewed by nonlinear strength parameters. The results show that the seepage prevention solution formed by plastic concrete cutoff wall and composite geomembrane is reasonable,the seepage prevention effect is obvious; and the stability of cofferdam under various cases meets the requirements,the safety of cofferdam is guaranteed.

关 键 词：土石围堰 深厚覆盖层 渗流 边坡稳定性 乌东德水电站 

分 类 号：TV551.31[水利工程—水利水电工程]