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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。
Carsington dam instability is a classic case of the dam industry. Some studies have not analyzed the effect of the active traction mechanism of the loess layer under the dam on its instability, and the relevant simulation studies are based on the conventional finite element method. For the shear band Such discontinuous displacement fields are not intuitive enough to describe the formation of shear bands and the evolution of soil mechanics behavior. The instability analysis of Carsington dam is carried out by using the self-developed simulation system of shear zone expansion process in the soil based on the extended finite element method. The results show that this simulation system can better track the shear band in the heart wall of Carsington Dam The path and formation process of Carsington dam are revealed, and the instability mechanism of Carsington dam is verified. The applicability of the constructed simulation system under complicated structure and complex stress is verified.