Analysis of Longitudinal Seismic Response of Shield Tunnel
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摘要: 为了探讨盾构隧道的纵向地震响应特性,采用地层-隧道整体三维有限元模型,对武汉长江越江盾构隧道的地震响应进行了分析,主要研究了合理的盾构隧道力学模型、隧道与地层之间的相互作用以及隧道的振动特性.通过隧道与地层的整体分析,得到了盾构隧道位移和应力的分布及其随时间的变化曲线.计算结果表明:压缩波引起的纵向拉、压应力和剪切波引起的扭曲变形是隧道抗震设计的关键.Abstract: In order to investigate the characteristics of longitudinal seismic response of shield tunnels,the seismic response of a shield tunnel across the Yangtze River in Wuhan was investigated with a three-dimensional finite element model for ground-tunnel interaction.The investigation mainly concerns the reasonable mechanics model,the interaction between tunnel and ground,and the vibration characteristics of tunnels.The research obtains the distribution of displacement and stress and their time-dependent curves.The numerical results show that the key points in the aseismatic design of tunnels are the tension and compression stresses in the longitudinal direction of tunnels under a compression wave and the torsional displacement of tunnels under a shear wave.
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Key words:
- shield tunnel /
- 3-D finite element method /
- seismic response analysis
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