强度折减法在顺层边坡稳定性分析中的应用

Application of strength reduction FEM in slope stability analysis

以有限元解的不收敛确定强度储备安全系数,并由水平方向位移突变和等效塑性应变云图辅助验证,提高边坡稳定性分析的准确性。将基于ANSYS软件的强度折减法所得强度储备安全系数转换为摩尔-库仑匹配D-P准则(非关联)条件下的安全系数,与传统工程实践中采用的安全系数接轨。并确定潜在剪出口位置和滑动面滑动次序,为边坡治理方案的制定提供参考。

In this paper, non-convergence in finite element solution was taken as a evaluation criterion of slope failure, using continuous contours of nodal x- displacement and equivalent plastic strain to validate the failure of slope. With the strength reduction, the numerical non-convergence occurs, the safety factor using ANSYS with the Mohr-Coulomb hexagon circumcircle criterion is obtained under the plane strain. Then transform it into the safety factor based on Mohr-Coulomh matching Drucker-Prager yield criterion, because that can be easily accepted and adopted by traditional project applications. It can still find out the location of each shear outlet and the glide order of each slip surface. This paper can provid basis for the projects of landslide treatment.