Research on Construction Anti-seepage of Earth-rock Cofferdam of Complex Foundation
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摘要: 某水电站上游围堰在围堰左岸基础位于基岩上,右岸基础位于松动体上,中间河床覆盖层自下而上分为三类岩组,其中Ⅰ、Ⅲ类岩组岩层属强透水层,Ⅱ类岩组属中等-强透水层。围堰挡水后将产生集中绕坝渗漏。为解决上游围堰防渗及绕坝渗漏问题,确定最优防渗方案,对上游围堰及基础进行了三维有限元渗流计算。计算结果表明,确定河床覆盖层必须修筑混凝土防渗墙进行防渗,但根据实际的地形条件以及施工难度情况,对右岸松动体的防渗方案做了相应优化,确定采用防渗帷幕进行松动体内的防渗。Abstract: The left bank foundation of one hydropower station upstream is on bedrock,the right bank foundation is on the loosening body.The upstream overburn layer is devided into three kinds of rocks.The I and III rock layer are the strong leakage layers,and the II layer is medium leakage layer.Central dam circle leakage will appear after retaining the water of cofferdam.To calculate the three-dimensional finite element of the upstream cofferdam and foundation in order to solve the problems of anti-seepage and dam circle leakage of upstream cofferdam and choose the optimum plan.The calculation shows that we must build the concrete anti-seepage wall of the river body overburn layer.According to the real terrain condition and the difficulty of construction,we optimize the anti-seepage plan to the loosening body of the right river bank and decide to choose the anti-seepage curtain to prevent the seepage of the loosening body.
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