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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。
In order to simulate the process of shear band propagation in soil slopes, this paper embeds the method of extended control of regional control into the improved finite element (XFEM) program to build a simulation system that can trace the propagation of shear bands in soil and uses This system simulates the formation of shear zones in two soil slopes and verifies its rationality. The results show that the method of regional control extension analysis can well describe the influence of stress concentration and redistribution at the tip of shear band on the propagation direction of shear band and provide a more reasonable dominant region for the judgment of the propagation direction of shear band in soil It is hypothesized that the XFEM program based on the regional control extension analysis method can reasonably describe and track the expansion process and path of shear band in the soil slope.