厚覆盖层上闸基渗流分析与基础处理措施研究

渗漏与抗渗稳定性问题一直是覆盖层上建设闸坝过程中遇到的一个极其重要的工程地质问题.结合某水电站枢纽工程,运用三维有限元和地下水动力学的基本理论分析了闸基的流场,并对防渗墙的深度和止水片的作用效果进行了敏感性分析,对改善闸基渗漏和闸基抗渗稳定性的工程措施做了全面的评价.研究表明,采用目前的处理措施可以大部分或全部截断坝基中的集中渗漏,有效地改善闸基的渗透稳定性.

Study of Seepage of Sluice Foundation on Deep and Overburden Layer and Engineering Measures

Seepage and the stability of anti-permeability are very important engineering geologic problems during the construction of a dam on covering layer.Based on the construction of a hydropower station with a deep cover,the seepage conditions of the sluice foundation with corresponding engineering measures are analyzed by using 3D FEM and the basic theory of underground hydrodynamics.At the same time,the sensitivity analysis of the effect of the water stop strip with the anti-seepage wall at different depths is performed.Finally,a comprehensive evaluation of estimating the engineering measures which are used to prevent the leakage of the dam foundation and to ensure the stability of the dam foundation is given.Studies have shown that the treatment measures proposed can be used to stop the concentrated seepage of the sluice foundation mostly.The measures play an important role in the process of avoid the seepage failure and reducing the seepage quantity of the covering layer under the sluice foundation,so as to provide reference for the similar projects and correlation study in the future.