有限元强度折减法对两类土坡的稳定性分析

基于强度折减理论对两类土坡进行稳定性分析，根据土体破坏机理，对土体的抗剪强度参数c，φ以不同的折减系数进行折减。针对工程实际中以单一的安全系数表示边坡的安全储备情况，采用两种方法对折减后的安全系数进行对比分析:最短路径法物理意义较为清晰，最小平均值法计算较为便捷，两者在数值上差距并不大。并对两类土坡的剪胀性作为影响因素与c，φ同时进行折减分析，作出各自安全系数受剪胀角的影响曲线，得出黏性土坡可以不考虑剪胀性，砂性土坡不仅在评定安全系数中考虑剪胀角的影响，在评估失稳破坏程度上也要考虑剪胀角的影响。

Stability Analysis of Two Kinds of Slope by Strength Reduction Finite Element Method

This paper carried out stability analysis of two kinds of soil slope on the basis of shear strength reduction theory and, according to soil failure mechanism, made reduction of the shear strength parameters of soil mass like c and φ, by various reduction factors. Whereas the slope’s emergency capacity is expressed in engineering practice by single safety factor, the reduced safety factor was compared and analyzed by two methods as follows: the shortest path algorithm has relatively clear physical meaning, the minimum mean algorithm has relatively simple calculation, and the both have a modest gap on their numerical values. In addition, the paper took the dilatancy of slope as the influencing factor to made reduction analysis with the c and φ, and plotted the respective safety factor-dilatancy angle curve, thus concluded that cohesive soil slope may not take dilatancy into consideration, however, sandy soil slope takes dilatancy into consideration in the evaluation not only of safety factor, but also of unstable failure.