A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Seismic response of immersed tunnel in liquefiable seabed considering ocean environmental loads
Highlights Effective stress characterization is present for the seismically induced seabed-tunnel interactions. A new source term is defined in the Biot’s coupled solid–fluid formulation for the residual EPWP. Model calibrations are carried out by retrospective simulations of cyclic axial–torsional tests. Effect of ocean environmental loads on the seismic response of immersed tunnel are interpreted.
Abstract 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.
Seismic response of immersed tunnel in liquefiable seabed considering ocean environmental loads
Highlights Effective stress characterization is present for the seismically induced seabed-tunnel interactions. A new source term is defined in the Biot’s coupled solid–fluid formulation for the residual EPWP. Model calibrations are carried out by retrospective simulations of cyclic axial–torsional tests. Effect of ocean environmental loads on the seismic response of immersed tunnel are interpreted.
Abstract 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.
Seismic response of immersed tunnel in liquefiable seabed considering ocean environmental loads
Zhao, Kai (author) / Zhu, Shengdong (author) / Bai, Xiaoxiao (author) / Wang, Qiuzhe (author) / Chen, Su (author) / Zhuang, Haiyang (author) / Chen, Guoxing (author)
2021-06-11
Article (Journal)
Electronic Resource
English
Stability of immersed tunnel in liquefiable seabed under wave loadings
| Elsevier | 2020
Seismic dynamics of offshore breakwater on liquefiable seabed foundation
| Elsevier | 2015