基于滑面应力场修正的改进极限平衡法

结合极限平衡条分法和有限元法的各自优点,提出从有限元法的分析结果中提取出滑动面上的应力分布,然后通过转化求得滑动面上的正应力分布,以此正应力作为边坡滑动面上的初始应力。引入两个未知参数对滑动面上的正应力进行修正,把修正后的滑动面正应力带入极限平衡方程组中,经简单迭代计算,求出未知参数和边坡的安全系数。通过对工程实例的稳定性计算,对比分析该方法和其他常用方法的计算结果,验证了该方法的合理性,其计算结果能够真实反映边坡的稳定状态。

The revised limit equilibrium method on normal stress placed on sliding surface

Combining the advantages of the limit equilibrium slice method and finite element method, the stress distribution on the sliding surface is concluded from the analysis result of finite element method. Through simple transformation, the normal stress distribution on the sliding surface can be obtained which could be used as initial stress on the sliding surface of slope. Then two unknown parameters were introduced to make correction for the normal stress which will led to the unknown parameter and safety factor of slope by substituting revised normal stress on the sliding surface into limit equilibrium equations and several simple iteration. By comparing the stability calculation results of the method introduced and other normal methods in specific engineering, the feasibility of the introduced method is verified.