采用接触面单元分析砼-岩系统的力学行为

Mechanical Behavior Analysis of Concrete-Rock System Using Interface Element

考虑实际修建过程中塔基岩石开挖的施工特点和砼分期浇筑特点,通过建立三维实体模型,根据基于大变形理论的快速拉格朗日方法,运用考虑库仑屈服准则的塑性接触面单元计算了锦屏一级水电站泄洪洞进口塔基砼-岩接触系统的应力和变形,评价了塔基的稳定性,并与直接考虑材料为实体单元的计算结果进行了比较。工程算例数值计算结果表明,采用接触面单元来分析砼-岩系统的力学行为更合理、更实用。

Interface element method is presented to compute the stress and deformation of tower foundation by considering the construction characteristics of rock excavation and concrete constructed with different stages in actual construction. By establishing three-dimensional solid model, utilizing fast Lagrange method based on large deformation theory, and using plastic interface element considering Coulomb yieldlaw, the stress and deformation of concrete-rock system are accomplished for tower foundation of Jin Ping stage-I hydropower station spillway tunnel inlet. And then, its stability is evaluated. Finally, comparing with the calculation results directly considering material as solid element, some useful conclusions are obtained. The analytical results show that it is more reasonable and practical to analyze mechanical behavior of concrete-rock system by using interface element.