基于试验和有限元法获取滑面强度参数

Acquisition of Sliding Surface's Strength Parameters Based on Experiment and Finite Element Method

在滑坡稳定性计算和工程设计中滑带土的内聚力(C)和内摩擦角(φ)取值对工程至关重要。首先采用有限元法,对滑带土进行应力仿真分析,再结合滑带土室内试验的相关物性指标及强度特征,得到滑动面的强度参数,其结果与室内直剪试验所得到的滑带土强度参数值以及刚体极限平衡法反演得到的参数值十分接近。该方法不仅可作为该滑坡稳定性计算参数选取的合理依据,也可以作为获取滑动面强度参数的另一种行之有效、缜密而又合理的新方法。

In the landslide stability calculation and engineering design,it is very important to get the right value of cohesion（C） and internal friction angle（φ） for the sliding zone soil.Firstly,this paper uses the finite element analysis method to conduct stress simulation analysis of the landslide slope.Then,by adopting related physical index and intensity properties of laboratory testing indicators of sliding zone,it can invert the strength parameters of the slipping surface,and the inversion results are very close to the value of indoor direct shear test of the sliding zone soil strength parameters.It provides a reasonable basis for the calculation of landslide stability in the selection of parameters,it also proposed a well-established,and more careful method for the inversion strength parameters of sliding surface.