基于扩展有限元法的混凝土重力坝多裂纹数值模拟

针对含有多个初始裂纹的混凝土重力坝的裂纹扩展问题,在ABAQUS有限元分析软件上,应用扩展有限元法和黏聚裂纹模型来进行数值模拟。分析了多裂纹的扩展路径以及主导裂纹的荷载-裂缝口张开位移。结果表明,混凝土重力坝多裂纹的扩展路径与文献结果几乎相同,主导裂纹的荷载-裂缝口张开位移曲线与文献结果有差异,但差异很小。可见采用扩展有限元法能够精确地模拟混凝土重力坝多裂纹从加载到失稳破坏的全过程,无需重新划分网格,减少了计算量,为解决工程实际问题提供了一种有效的应用途径。

Numerical Simulation of Multiple Cracks in Concrete Gravity Dam Based on Extended Finite Element Method

In order to solve the crack propagation problem of concrete gravity dam with multiple initial notches, the extended finite element method and the cohesive crack model were applied to numerical simulation on the finite element analysis software of ABAQUS. The path of multiple cracks propagation and the load-crack opening displacement of the main crack were analyzed. The results show that the path of multiple cracks propagation in concrete gravity dam is almost consistent with the results of the literature, and the load-crack opening displacement curve of the main crack has a little difference between them. It is concluded that the application of the extended finite element method can accurately simulate the whole process of multiple cracks in concrete gravity dam from loading to instability failure without having to remesh and reduce the computation, providing an effective application way to solve practical engineering problems.