基于FEM强度折减系数法的某库岸斜坡稳定性分析

Stability Analysis of a Reservoir Slope Based on the Method of FEM Strength Reduction

有限元强度折减法是近年来岩土工程界广受关注的一种边坡稳定性分析方法。通过对岩体结构面强度折减,使斜坡达到不稳定状态,有限元计算不再收敛,此时的折减系数就是斜坡的安全稳定性系数。本文对某岸坡进行非线性有限元接触分析,计算表明,与传统刚体极限平衡法计算的稳定性系数很接近,而且有助于对滑体破坏的机制的理解。工程实例证明,有限元强度折减法在斜坡的稳定性评价中是切实可行的。

Nonlinear FEM strength reduction is a slope stability analysis method, which is widely cared in the geotechnical field. With the anti-shear parameters c- φ reduction, the nonlinear FEM model of slope reduced to instable status and the numerical non-convergence occurred simultaneously. At that time, the safety stability factor was obtained by c-φ reduction algorithm for which can be regarded as equal to stability factor. In this paper, some reservoir slope nonlinear contact analysis was made and the calculation results showed that it accorded well to the traditional grid limit equilibrium method. Therefore, it showed that strength reduction FEM was feasible to assess slope stability.