基于强度折减法的土石坝坝坡稳定性分析

Analysis on Slope Stability of Earth-Rockfill Dam Based on Strength Reduction Method

基于边坡稳定性能的评估问题,介绍有限元强度折减法的基本原理以及在有限元软件上求解边坡安全系数的过程。通过对工程实例计算分析得到最危险的滑动面和安全系数。计算结果与瑞典条分法进行坝坡稳定性分析结果对比表明:两种方法所得的安全系数相差1.47%,滑动面形状、走向和位置一致,并且数值模拟显示的土石坝塑性渐进变化过程符合实际工程塑性变化过程。因此,基于有限元强度折减法对土石坝坝坡等类似工程边坡最终状态稳定性评估分析具有一定的实用性和可靠性。

In order to evaluate slope stability,the basic principle of finite element strength reduction method and the process of solving slope safety factor in finite element software have been introduced. By analyzing the engineering the most dangerous slip surface and the factor of safety is calculated. Calculation results with the Swedish article points method to carry on the dam slope stability analysis shows that the results of two methods of the safety factor obtained by 1. 47%,the sliding surface shape,direction and position is consistent,and the result shows that plastic incremental change process of earth and rockfill dam conforms to the actual engineering plastic change process. Therefore,based on finite element strength subtraction of earth and rockfill dam such as dam slope engineering slope stability analysis has certain practicability and reliability.