Seismic Response Analysis of a Shield Tunnel Connected to a Vertical Shaft
Seismic Response Analysis of a Shield Tunnel Connected to a Vertical Shaft
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发表时间：
2012
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通讯作者：
C. FreddyDuran;Tomoya Tsunei;Y. Maruo
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作者：
C. FreddyDuran;Tomoya Tsunei;Y. Maruo
本文对某立井连接盾构隧道进行了地震反应分析。主要目的是研究由竖井的摇摆引起的扭转效应对与竖井相连的隧道的动力响应和应变响应的影响。本文采用考虑土体非线性的三维有限元分析方法，分析了三种模型：考虑隧道-竖井结合部的节理模型、仅竖井模型和仅隧道模型。动力响应的结果由位移和应变的时程响应来表示。本文将剪力变形定义为隧道顶板与隧道仰拱之间的相对位移，分析结果表明，在隧道-竖井交界处附近，竖井晃动引起的隧道剪力变形影响了隧道衬砌的应变响应。
This paper presents a seismic response analysis of a shield tunnel connected to a vertical shaft. The main objective is to investigate the influence of the torsional effects caused by the rocking of the vertical shaft on both the dynamic response and strain response of the tunnel connected to the vertical shaft. By using a three dimensional finite element analysis considering soil nonlinearities, three models are analysed herein: A jointed model considering the tunnel-shaft junction, a shaft-only model, and a tunnel-only model. The results of the dynamic response are shown by time-history responses of displacements and strains. Defining herein the shear distorsion as the relative displacement between the tunnel crown and invert, the analytical results show that in the proximity of the tunnel-shaft junction the strain response of the tunnel lining is influenced by the shear distortion of the tunnel caused by the torsional effects of the vertical shaft rocking.