RESEARCH ARTICLE


3-D Poro-Elastoplastic Model for Short-Crested Wave-Induced Pore Pressures in a Porous Seabed



Z. S. Wong1, C. C. Liao1, D. S. Jeng*, 1, 2
1 Center for Marine Geotechnical Engineering Research, State Key Laboratory of Ocean Engineering, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240 China
2 Griffith School of Engineering, Griffith University Gold Coast Campus, Queensland 4222, Australia


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Creative Commons License
© 2015 Wong et al ;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* ddress correspondence to this author at the Center for Marine Geotechnical Engineering Research, State Key Laboratory of Ocean Engineering, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai, 200240 China; E-mail: d.jeng@griffith.edu.au


Abstract

In this paper, a three-dimensional poro-elastoplastic model for the short-crested wave-induced pore pressures in a porous seabed is presented. Unlike the previous models, both elasticity and plasticity of seafloor are considered in the present model. This study considers the effects of wave and soil characteristics on the pore pressures and was validated with the previous wave experiment data. As the numerical analysis shows, higher value of plastic parameter leads to a faster residual pore pressure accumulation, which is closely related to the occurrence of seabed liquefaction. In particular, at the dissipation stage, residual pore pressure sharply decreases when enlarging plastic parameter , which dominates the velocity of accumulation of plastic volumetric strain.

Keywords: Elasto-plastic soil, pore pressure, short-crested wave.