ZMT水电站施工期上游围堰渗流场及稳定性数值分析

Numerical Analysis on Seepage Field of the Upper Cofferdam and Its Stability in During Construction of ZMT Hydropower Station

采用Geostudio/seep大型岩土工程有限元分析软件对西部某河流中游段ZMT水电站在施工期上游围堰渗流场及背水面堰坡稳定性进行数值计算,得到不同基坑开挖高程的围堰渗流场各要素分布图,并对围堰在渗流作用下的堰坡稳定性进行评价。结果表明,在基坑开挖过程中,个别工况存在渗透破坏以及堰坡安全系数较小等问题,建议采取相应措施提高稳定性,对设计方修改方案提供一定的依据。

Based on the finite element analysis software of Geostudio / Large geotechnical engineering, the seepage field and the slope stability of the upstream cofferdam of a middle reaches ZMT hydropower station in the western part of a river are calculated by numerical calculation, and the distribution map of each element of the cofferdam seepage field of different excavation elevation of the foundation pit is obtained , and the stability of the weir slope under the action of seepage is evaluated. The results show that during the excavation of the foundation pit, there are some problems such as the infiltration and destruction of individual working conditions and the small safety factor of weirs. It is suggested that measures should be taken to improve the stability and provide some basis for the design scheme modification.