Journal
APPLIED OCEAN RESEARCH
Volume 73, Issue -, Pages 27-41Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apor.2018.01.011
Keywords
Wave; Liquefaction; Loose sand deposit; Pore pressure accumulation
Categories
Funding
- National Science Foundation of China [51209183, 51308259, 51409142, 51779220]
- Open Foundation of State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University [2016491011]
- Griffith University Deputy Vice Chancellor (Research) International Postgraduate Scholarship
- SEET Postgraduate Research Scholarship
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The failure of marine structures is often attributed to liquefaction in loose sand deposits that are subjected to ocean waves. In this study, a two-dimensional integrated numerical model is developed to characterize the liquefaction behaviours of loosely deposited seabed foundations under various types of ocean waves. In the present model, Reynolds-Averaged Navier-Stokes (RANS) equations are used to simulate the surface wave motion, and Biot's consolidation equations are used to link the solid-pore fluid interactions in a porous medium. A poro-elasto-plastic solution is used to reproduce foundation behaviour under cyclic shearing. Unlike previous investigations, both oscillatory and residual soil responses were considered; they are coupled in an instantaneous approach. Verification of the model results to the previous centrifugal wave tests is carried out, obtaining fairly good agreement. Numerical examples show that foundation behaviour under various types of wave loading, particularly standing waves or a solitary wave, embodies a completely two-dimensional process in terms of residual pore pressure development. The parametric studies demonstrate that liquefaction caused by the build-up of pore pressures is more likely to occur in loosely deposited sand foundations with poor drainage and under large waves. (C) 2018 Elsevier Ltd. All rights reserved.
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