基于预插黏性界面单元的拱坝地震破坏过程分析

Seismic failure analysis of the arch dam using cohesive elements

为确定预插黏性界面单元法模拟高拱坝在强震作用下破坏过程的有效性和适用性,基于黏性裂缝模型理论,在实体单元中嵌入黏性界面单元(Cohesive Interface Elements),对小湾拱坝的强震破坏过程进行了数值模拟和分析,模拟结果与损伤模型和振动台试验的结果接近。研究结果表明,地震荷载作用下抗震设防的薄弱部位在拱冠梁顶部范围,预插粘性界面单元法可以有效模拟强震作用下坝体裂缝的断裂和扩展过程。

In order to determine validity and applicability of numerical simulation for fracture process of arch dam under strong earthquake, based on the theory of cohesive crack model, cohesive elements were embedded between solid elements （Cohesive Interface Elements）, the failure process of Xiaowan arch dam during strong earthquake was simulated and analyzed, the numerical results were close to those obtained from damage model method and sha- king table test. The research results indicated that the top of crown cantilever was the weak position under seismic loading, it was an efficient method for simulating crack propagation of arch dam subjected to strong earthquake.