基于数值应力场的边坡临界滑动场

数值分析方法(有限元、有限差分等)可计算边坡应力、变形和破坏,但直接计算边坡安全系数比较困难;而极限平衡法需对边坡体内力作出假设,计算精度受到限制。利用数值分析方法计算得到的应力场,重新定义推力最大原理中推力的含义,将常规边坡临界滑动场数值模拟方法作进一步的改进,提出基于数值应力场的边坡临界滑动场方法。该方法可充分发挥两大方法的优势,能够准确、方便地搜索出边坡临界滑动面位置,并给出更合理的边坡安全系数。通过两个算例的稳定性分析,并与其他方法进行比较,验证了该方法的准确性和合理性。

Critical slip field of slopes based on numerical stress field

Numerical methods (finite element method, finite difference method, etc.) can be used to calculate stress, strain and failure of slope; but it is difficult to calculate the safety factor of slope stability directly. Limit equilibrium methods can obtain the factor of safety, but they need to assume the interslice forces, which affects the calculation accuracy. Based on the stress field obtained by numerical methods, by defining the maximum thrust forces and improving numerical simulation method of conventional critical slip field of slope, the critical slip field method of slope based on numerical stress field is proposed. The results obtained by using this method for two examples have been compared with other methods. It is shown that the proposed method combines the advantages of numerical method and limit equilibrium method so as to find the critical slip surface of slope accurately and conveniently, and give more reasonable safety factor.