基于强度折减法的岩质边坡稳定性二维有限元分析

非线性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,使岩质边坡达到不稳定状态,有限元计算不再收敛,此时的折减系数就是边坡的安全稳定性系数。结合工程实例,对边坡稳定性进行二维有限元分析,得到了符合实际情况的分析结果,表明基于强度折减法的边坡稳定性二维有限元分析是可行的。研究结果表明,采用有限元应力分析方法和强度折减法相结合的方式能快速有效地求解岩质边坡的稳定安全系数,并可为岩质边坡稳定性评价提供一定的指导依据。

2D FEM ANALYSIS OF ROCK SLOPE STABILITY BASED ON STRENGTH REDUCTION METHOD

Nonlinear FEM strength reduction is a slop stability analysis method which is widely cared in the geotechnical field. With the anti-shear parameters c- reduction, the nonlinear FEM model of rock slope reduced to instable status and the numerical non-convergence occurred simultaneously. And then the safety factor was obtained by c- reduction algorithm for which can be regarded as equal to stability factor . With a case study, the results of 2D analyses are analyzed, which matches the actual circumstance. The study results show that the stability safety factor of the rock slope can be obtained in a quick and effective way by using the finite element stress analysis method in combination with the finite element strength reduction method, which can provide certain basis for evaluation of rock slope stability.