Abstract
This paper simulates the wave–seabed interactions considering the principal stress rotation (PSR) by using the finite element method. The soil model is developed within the framework of kinematic hardening and the bounding surface concept, and it can properly consider the impact of PSR by treating the PSR generating stress rate independently. The simulation results are compared with centrifuge test results. The comparison indicates that the simulation with the soil model considering the PSR can better reproduce the test results on the development of pore water pressure and liquefaction than the soil model without considering the PSR. It indicates that it is important to consider the PSR impact in simulation of wave–seabed soil interactions.
Highlights
Study of wave–seabed interaction is essential to offshore developments
Because the plastic deformation caused by the principal stress rotation (PSR) from the wave loading can accelerate undrained soil liquefaction, ignoring this PSR-induced deformation may lead to unsafe design
This paper simulates the wave–seabed interaction by using a newly developed PSR model which can properly consider the impact of principal stress rotations
Summary
Study of wave–seabed interaction is essential to offshore developments. There are a few characteristics on loading conditions on seabed soil, and one of them is that the soil is subject to considerable principal stress rotation (PSR). One of the best known researches in this topic was the finite element simulation conducted by Sassa and Sekiguchi [14] They implemented a cyclic loading elastoplastic soil model into the finite element analysis to study wave–seabed interaction under both progressive and standing waves. They compared the simulation results with the experimental data and found that the sand bed is less resistant to the liquefaction if the PSR is considered in the soil model. This paper aims to take into account the impacts of PSR in the numerical simulations of wave–seabed interactions by using a well-established PSR soil model This model is developed on the basis of kinematic hardening principle with bounding surface concept and critical state concept. They will be implemented into the finite element software to simulate centrifuge tests of wave–seabed interactions by Sassa and Sekiguchi [13], and the simulation results will be compared with experimental results
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