土坡中剪切带形成过程的数值模拟

为实现对土坡中剪切带扩展过程的模拟,该文将区域控制扩展分析方法嵌入改进的扩展有限元(XFEM)程序中构建了可追踪土中剪切带扩展过程的模拟系统,并利用此系统对两个土坡中剪切带形成过程的算例进行了模拟研究,验证了其合理性。结果表明,区域控制扩展分析方法可较好地描述剪切带尖端应力集中和重分布对剪切带扩展方向的影响,同时为土中剪切带扩展方向的判断提供了更合理的区域占优假定,从而使得基于区域控制扩展分析方法的XFEM程序能够合理地描述和追踪土坡中剪切带的扩展过程和路径。

NUMERICAL SIMULATION OF THE EVOLUTION OF SHEAR BAND IN SOIL SLOPE

The local dominant analysis method was integrated into the program of modified extended finite element method to develop a simulation system for tracing the evolution of shear bands in soil slopes.Two numerical tests of the evolution of shear bands in soil slopes were performed using this system to verify its reasonableness and applicability.The results show that the local dominant analysis method can describe the influence of stress concentration and redistribution in the tip area in the direction and process of evolution of shear band reasonably.This provides a more reasonable local dominant assumption for the criterion of evolution direction of shear band in soil,which makes this simulation system be able to describe and trace the evolution processes and paths of shear bands in soil slopes reasonably.