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中文摘要：
Carsington坝失稳是坝工界的经典案例，已有研究并未分析坝体下伏黄粘土夹层的主动牵引机制对其失稳的作用，且有关模拟研究基于常规有限元法，对于剪切带等不连续位移场的描述不够直观，更无法探讨剪切带形成过程及土体力学行为的演化。该文应用自主开发的基于扩展有限元方法的土中剪切带扩展过程模拟系统进行了Carsington坝的失稳分析，结果表明：该模拟系统较好地追踪了Carsington坝心墙中的剪切带路径和形成过程，揭示了Carsington坝的失稳机理；验证了所构造的模拟系统在复杂结构和复杂受力条件下的适用性。
英文摘要：
Previous studies ignored the possible contribution of the yellow clay interlayer to the failure mechanism of Carsington earth dam, and these studies were mainly based on conventional finite element method, which can neither describe discontinuous displacement field such as shear band visually, nor be able to investigate the formation of shear band and the evolution of the mechanics behavior of soils. In this paper, a self-developed simulation system for the evolution of shear band in soil based on the extended finite element method is applied to simulate the failure process of Carsington dam. The results show that the simulation system is able to trace the path and evolution of shear band in the central core of Carsington dam, and reveales the failure mechanism of Carsington dam reasonably, which proves the applicability of this simulation system in complicated structures and stress conditions_
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