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Seismic response of immersed tunnel in liquefiable seabed considering ocean environmental loads
Tunnelling and Underground Space Technology ( IF 6.9 ) Pub Date : 2021-06-23 , DOI: 10.1016/j.tust.2021.104066
Kai Zhao , Shengdong Zhu , Xiaoxiao Bai , Qiuzhe Wang , Su Chen , Haiyang Zhuang , Guoxing Chen

Unlike the terrigenous site condition, the seabed site is characterized by complex hydrodynamics in the ocean environment (i.e. ocean waves and currents). This paper investigates the significance of the ocean environmental loads on the seismic interactions between the buried immersed tunnel and the surrounding soil undergoing buildup of excess pore water pressure (EPWP) and residual liquefaction. A fully coupled nonlinear effective stress analysis framework is proposed, integrating liquefaction/solidification analysis procedure with consideration of cyclic plasticity, of partial drainage, of finite soil deformation and of soil-structure interaction. A new source term is defined in the Biot’s coupled solid–fluid formulation for the residual EPWP, as the phase-resolved plastic volume strain of soil skeleton. The proposed model is calibrated against the benchmarking data of undrained stress-controlled cyclic axial–torsional test. The numerical results reveal that the continuous disturbance of ocean wave and current has major consequences for the seismic soil-structure interactions such as EPWP response, liquefaction pattern of seabed over the contact areas and uplift/settlement of immersed tunnel, especially at the post-liquefaction stage. It is concluded that ignoring the environmental loads caused by ocean wave and current in seismic design practice of immersed tunnels can be misleading.



中文翻译:

考虑海洋环境载荷的可液化海底沉管隧道地震响应

与陆源场地条件不同,海底场地的特点是海洋环境中的复杂流体动力学(即海浪和洋流)。本文研究了海洋环境载荷对埋入式沉管隧道与发生超孔隙水压力 (EPWP) 累积和残余液化的周围土壤之间地震相互作用的重要性。提出了一种完全耦合的非线性有效应力分析框架,将液化/凝固分析程序与循环塑性、部分排水、有限土壤变形和土壤-结构相互作用结合起来。一个新的源项在 Biot 的固体-流体耦合公式中被定义为残余 EPWP,作为土壤骨架的相分辨塑性体积应变。所提出的模型根据不排水应力控制循环轴扭试验的基准数据进行校准。数值结果表明,海浪和海流的持续扰动对地震土壤-结构相互作用产生重大影响,例如 EPWP 响应、接触区域海床的液化模式和沉管的隆起/沉降,特别是在液化后阶段。结论是,在沉管隧道抗震设计实践中忽略海浪和海流引起的环境载荷可能会产生误导。海床在接触区域的液化模式和沉管的隆起/沉降,特别是在液化后阶段。结论是,在沉管隧道抗震设计实践中忽略海浪和海流引起的环境载荷可能会产生误导。海床在接触区域的液化模式和沉管的隆起/沉降,特别是在液化后阶段。结论是,在沉管隧道抗震设计实践中忽略海浪和海流引起的环境载荷可能会产生误导。

更新日期:2021-06-23
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