基于数值强度折减法的边坡失稳判定方法

利用有限元强度折减法进行边坡稳定分析时,对边坡稳定状态的判断影响到强度折减有限元法得到的折减系数,进而影响安全系数的计算结果.以Griffiths边坡为算例,在Abaqus软件中分别对采用数值迭代不收敛、特征部位位移突变、广义塑性应变或等效塑性应变贯通3类判据作为判断失稳的标准进行了计算.结果表明数值计算结果是否收敛与...

Slope Instability Judgment Method Based on Numerical Strength Reduction Method

When the finite element strength reduction method is used to analyze the slope stability,the judgment of the slope stability state will affect the reduction factor obtained by the strength reduction finite element method,and then affect the calculation results of the safety factor.Taking Griffiths slope as an example,three kinds of criterions,i.e.non-convergence of numerical iteration,sudden change of displacement at characteristic position,and penetration of generalized plastic strain or equivalent plastic strain,are used to judge the instability in ABAQUS software.The results show that there is a corresponding relationship between the convergence of the numerical results and the instability of the slope.When the calculation is terminated due to non convergence,the strength reduction coefficient has little change,and the setting of the convergence condition of the finite element also has little effect on the results.It is suggested that the convergence of finite element calculation be used as the basis of instability judgment.