三峡工程二期围堰应力变形分析

Stress-strain analysis on second cofferdam of Three Gorges project

采用三维有限元法对三峡工程二期围堰的应力变形进行了计算分析，着重讨论了塑性砼防渗墙的应力变形状态，评价了工程设计的安全性。计算中分别采用了三种本构模型模拟堰体材料的应力应变关系。文中引进了非饱和土毛细管吸力丧失理论，解释土石料的浸水软化现象，使计算结果更趋合理。

In this paper, 3-D FEM was used to calculate the stresses and de formations in the second cofferdam of Three Gorges project, especially, the stress-strain characteristics of the plasticity concrete seepage prevention wall were discussed, and the safety of the project was evaluated. Three constitutive models were employed to simulate the stress-strain relationships of the filled materials in the cofferdam. The theory that losing of capillary suction in unsaturated soil was used to explain the softening phenomena of soil during its immersing. The calculation results was more reasonable.