Abstract
Principal stress rotation (PSR) is an important feature for describing the stress status of marine sediments subject to cyclic loading. In this study, a one-way coupled numerical model that combines the fluid model (for wave–current interactions) and the soil model (including the effect of PSR) was established. Then, the proposed model was incorporated into the finite element analysis procedure DIANA-SWANDYNE II with PSR effects incorporated and further validated by the experimental data available in the literature. Finally, the impact of PSR on the pore-water pressures and the resultant seabed liquefaction were investigated using the numerical model, and it was found that PSR had a significant influence on the seabed response to combined wave and current loading.
Highlights
The physical processes of fluid–seabed interactions have attracted great attention from coastal and geotechnical engineers because of the growth in human exploration and development of offshore projects
Two new features were incorporated into an existing model for soil response: (1) Principal stress rotation (PSR) effects and (2) the combined wave and current loading
The seabed is considered to be an elastoplastic medium, and the discussed results are from simulations using the generalized plasticity model Pastor–Zienkiewicz Mark-III (PZIII) and modified PZIII model with PSR in the finite element analysis program DIANA-SWANDYNE II
Summary
The physical processes of fluid–seabed interactions have attracted great attention from coastal and geotechnical engineers because of the growth in human exploration and development of offshore projects. In addition to analytical approximations, several numerical models for the wave-induced oscillatory soil response for more complicated cases have been developed and applied to different offshore infrastructures. Using the results of direct shear tests [17], Seed and Rahman [7] proposed a 1D approximation with a source term for pore-water pressure generation Following this framework, several analytical solutions and numerical solutions for wave-induced residual liquefaction were proposed [4,5,8]. On the basis of the analytical solution for wave–current interactions [26], Ye and Jeng [27] were the first to investigate the wave (current)-induced oscillatory soil response in a porous seabed. The results of the parametric study are reported to examine the effects of PSR with combined wave and current loading
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