有限元强度折减法边坡失稳判据的统一性

目前有限元强度折减法边坡稳定性分析中广泛使用的边坡失稳判据主要有3类，即有限元数值迭代不收敛判据、特征部位位移突变判据、广义塑性应变或等效塑性应变贯通判据。对于上述3类判据的选用，一直以来存在较大的分歧。而从本质上看，3类边坡失稳判据具有一致性和统一性。之所以使用不同判据时计算结果表现出差异，是由于人为误判和有限元数值计算误差造成的。在具有足够计算精度的情况下，3类判据所得结果一致。

Uniformity of slope instability criteria of strength reduction with FEM

At present, there are three kinds of slope instability criteria widely used in the strength reduction finite elements slope stability analysis method; namely the non-convergence of solution, the abruptness of the displacement or deformation at a certain characteristic location and the connectivity of plastic zone. Which one is better among three main criteria for evaluating slope instability were widely disputed. In fact they are consistent and uniform. The difference among three main criteria’s calculations is due to human misjudgment and finite element numerical calculation error. With enough accuracy the results of three main criteria are the same.