多支撑挡墙边坡稳定性的强度参数折减有限元分析

Finite element analysis for slope stability with multi-braced retaining wall through reduction of strength parameters

探讨了强度参数折减二维有限元方法在深基坑工程中具多支撑挡土结构边坡稳定性分析中的应用。分析了挡土结构不同嵌固深度和支点条件对稳定性的影响,并与简单圆弧滑动条分法和毕肖普法计算结果进行了对比。研究表明,支点条件和桩墙嵌固深度对支护边坡稳定性有着同样重要的影响,证实了强度参数折减有限元法的合理有效性,且该方法能方便合理地考虑支点条件和桩墙嵌固深度对支护边坡稳定性的影响,为支点设定和桩墙嵌固深度的确定提供了合理依据。

The application of two dimensional （2D） finite element method based on the concept of reduction of strength parameters for the slope stability problems with multi-braced retaining structure was discussed. The effects of factors such as embedded depth and the braced conditions of retained structure were investigated. The results of the finite element method were compared with those computed by Ordinary Method of Slices and Bishop＇s Modified Method. It was shown that braced conditions and embedded depth of retained structure was also essential to slope stability with multi-braced retaining structure. It was also shown that the finite element method based on concept of reduction of strength parameters was reliable and effective and could consider easily the effects such as embedded depth and the braced conditions, and the obtained results provided reasonable warranty for confirming braced and embedded depth of retained structure.