基于非稳定渗流有限元的坝坡稳定分析

Stability analysis of dam slope based on finite element method of non-stationary seepage

对库水位连续下降的非稳定渗流问题 ,建立与定解问题相对应的泛函 ,再根据有限元原理 ,以变动的渗流自由面为流量 ,补给边界条件来模拟非稳定渗流过程 ,确定各个时段的自由面及等势线 .在渗流分析基础上进行坝坡稳定分析 ,采用BISHOP法 ,并搜寻最危险滑弧 ,计算相应的安全系数 .通过工程实例分析 。

In this paper, the function corresponding with definite solution is established to solve the problem of non-stationary seepage flow when the water-lever of reservoir upstream varies continuously. Then the process of non-stationary seepage regarding the variable free seepage surface as making up flow quantity boundary is simulated and the finite element method is used to determine the free surface and equi-potential line of various time interval. Based on the seepage analysis, the stability of earth dam slope is analyzed, the most dangerous slop circle is searched by BISHOP method. Finally, some significance conclusions are drawn through the calculation result of the example.