基于多尺度几何有限元模型分析的地铁盾构隧道地震反应研究

Seismic response research of multi-scale geometry modeling on subway shield tunnel

本文以武汉地铁为工程背景,以大型商业非线性有限元软件ABAQUS为计算平台,采用黏弹性人工边界避免地震波在土体截断边界上产生的虚假反射。采用混凝土塑性损伤模型模拟隧道管片在地震荷载下的非线性动力响应。采用局部精细化几何隧道管片模型代替原粗糙几何模型,从而建立同时描述结构宏观行为和局部细观行为的多尺度几何有限元模型。本文分析方法可为此类抗震数值分析提供参考。

In the engineering background of Wuhan metro,based on commercial FEM software ABAQUS for computing platform,using viscoelastic boundary to avoid false reflection of seismic wave on the artificial truncated boundary in soil,using local refined geometry model instead of rough geometry one,this paper has built a multi-scale geometry model which describes both macroscopic and microscopic mechanics. This method can provide reference for seismic resistance analysis.