强度折减有限元法分析成层土坡的适用性

Feasibility of shear strength reduction FEM in analysis of layered slope stability

通过实例讨论了强度折减有限元法分析成层土坡稳定的可行性,分析表明:对于均质土坡,强度折减得到的安全系数在工程允许的范围之内,但折减后的应力场发生了变化,不能用于分析原土坡的稳定性;对于多层土坡,通过简单折减土的强度指标c,tanφ,不能得到正确的应力场,也不能得到土坡的安全系数。

The feasibility of shear strength reduction FEM in analysis of layered slope stability is discussed by specific examples. It is showed that, for homogeneous slopes, the safety factor deduced from shear strength reduction is appropriate, while the stress or strain field was changed, so can not be used to analyze the slopes, and for layered slopes, neither right stress or strain field nor the safety factor can be got by reducing strength parameters c and simply.