基于XFEM的坝体损伤扩展模拟  

The Simulation to Dam Body Damage Extension Based on XFEM

作　　者：刘江川[1,2] 陈超 李燕 LIU Jiang-chuan(School of Hydraulic&Environmental Engineering,Changchun Institute of Technology,Changchun 130012,China)

机构地区：[1]长春工程学院水利与环境工程学院,长春130012 [2]吉林省水利电力工程物理级仿真与安全创新中心,长春130012

出　　处：《长春工程学院学报（自然科学版）》2019年第4期59-62,共4页Journal of Changchun Institute of Technology：Natural Sciences Edition

基　　金：吉林省教育厅科学技术研究项目(吉教科合字[2015]第301号)。

摘　　要：为研究混凝土坝在地震力作用下裂缝的扩展情况,用扩展有限元法(XFEM)对Koyna大坝进行仿真分析,以混凝土塑性损伤模型的损伤因子为变量,研究在地震荷载作用影响下混凝土坝体产生的损伤破坏情况。结果表明:采用扩展有限元模拟的坝体破坏模式与Koyna大坝实际破坏情况基本一致,用扩展有限元能够有效演示大坝在地震作用下的开裂过程,并且能够逼真地模拟出裂缝的扩展模式,在模拟的过程中,裂缝扩展不受边界约束,局部不需加密,有效控制了单元数量,节约计算成本,使复杂现实问题简单化。In order to study the extension of cracks in concrete dams under seismic loads,the simulation analysis to Koyna dam is carried out by extended finite element algorithm(XFEM).The damage factors of concrete plastic damage model are taken as variables to study the damage and failure of concrete dam under the influence of seismic load.The results show that the failure mode of dam body simulated by extended finite element method is basically consistent with the actual failure situation of Koyna dam.The cracking process of dam under earthquake can be demonstrated effectively by extended finite element method,and the crack propagation mode can be simulated vividly.In the simulation process,the crack propagation is not restricted by boundary,and the number of elements is effectively controlled without local encryption.The computing cost is saved and the complex practical problems are simplified.

关 键 词：扩展有限元 裂缝 地震 损伤因子 

分 类 号：TV331[水利工程—水工结构工程]