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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。
Finite element strength reduction method is a slope stability analysis method that has drawn much attention in geotechnical engineering in recent years. By reducing the strength of the rock mass structure, the slope reaches an unstable state and the finite element calculation does not converge any more. The reduction coefficient at this time is the safety and stability coefficient of the slope. In this paper, nonlinear finite element contact analysis of a bank slope is carried out. The calculation shows that it is close to the stability coefficient calculated by the traditional rigid body limit equilibrium method, and contributes to the understanding of the mechanism of the slide failure. The engineering example proves that finite element strength reduction method is practicable in the stability evaluation of slopes.