离散元-无限元非线性耦合法

Nonlinear coupling method for discrete element-infinite element

根据变形体动力学方程及模态分解原理 ,建立了可变形体离散元模型 .依照离散元法原理 ,选用边 边接触模型 ,推导出相应的理论公式并实现在边界上与无限元的耦合 .采用近场土体由离散元模拟 ,远场土体由无限元模拟 ,进行土 地下结构相互作用分析 .由静力问题的收敛性 ,验证了计算程序和计算参数选取的正确性 。

A discrete element model for the deformable for the deformable bodies was built according to the dynamic equation and the model decomposition Based on the fundamental principle of discrete element method, the contact model was selected and the corresponding theoretical formula deduced. In the boundary, the discrete element-infinite element coupling were achieved. The analysis of the soil-underground structure interaction effects was carried out when the nearby soil was described as discrete elements and the soil beyond as infinite ones. The valid of the calculating program and the selection calculating parameters were tested. The dynamic reaction of underground structure was obtained under the earthquake waves.