基于耦合分析法的地铁隧道抗震研究

Anti-seismic study on metro tunnel based on coupling numerical analysis method

在土体与结构动力相互作用理论的基础上,提出用有限元和无限元耦合分析法对地铁隧道结构进行抗震分析。为考虑相互作用的非线性特点,选用Ramberg-Osgood骨架曲线来模拟土体本构关系的非线性特性,同时选用GOODMAN单元来模拟土与结构接触面上的非线性接触状态。以双洞口矩形隧道结构为例进行了动力反应的分析与比较,得到了一些有益的规律和结论。

Coupling analysis method of finite element and infinite element is proposed to be used in the structural anti-seismic analysis of metro tunnel on the basis of soil-structure interaction theory. For a better consideration of nonlinear characteristics of soil-structure interaction, Ramberg-Osgood skeleton curve is adopted here to model constitutive relationship of soils, and also GOODMAN element is adopted to model nonlinear working states on the interface between soils and structure. This paper conducts the dynamic analysis and comparison on seismic response of a tunnel structure with double-hole rectangular section and draws some helpful conclusions.