深圳地铁3号线隧道交汇段地震响应分析

Seismic Response Analysis of Tunnel Intersection of Shenzhen Metro Line 3

地铁隧道交汇段等复杂地下结构一旦受到地震作用将会带来不可估量的损失,不同结构形式的地下结构的地震响应与破坏机理又不尽相同。对深圳地铁3号线明挖-盾构隧道交汇段展开了三维非线性动力时程响应分析,采用Midas GTS有限元软件,分析了隧道结构在设防地震、罕遇地震作用下的变形以及内力响应。研究表明,隧道结构在设防地震作用下,位于粉质黏土的盾构隧道段位移大于强风化花岗岩处的位移;隧道结构在交汇段、变截面位置处的内力明显增加,为相对薄弱的环节。

Three dimensional nonlinear dynamic time history response analysis is carried out for the intersection of open cut shield tunnel of Shenzhen Metro Line 3.The deformation and internal force response of tunnel structure under the action of fortification earthquake and rare earthquake are analyzed by using Midas GTS finite element software.The research shows that the displacement of the shield tunnel section in silty clay is greater than that in the intensely weathered granite under the earthquake protection of the tunnel structure;The internal force of the tunnel structure at the intersection section and variable section position increases obviously,which is a relatively weak link.