Numerical modelling of liquefaction in loose sand deposits subjected to ocean waves |
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| Institution: | 1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, China;2. Griffith School of Engineering, Griffith University Gold Coast Campus, QLD, Australia;3. Center for Marine Geotechnical Engineering Research, Department of Civil Engineering, State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China;4. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China;5. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing, China;1. Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China;2. Griffith School of Engineering, Griffith University Gold Coast Campus, Queensland QLD 4222, Australia;3. Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China;1. School of Civil Engineering, South West Jiaotong University, Sichuan 610031, China;2. Key Laboratory of Theory and Technology of High Speed Railway Structures, Ministry of Education, South West Jiaotong University, Sichuan 610031, China;3. Griffith School of Engineering, Griffith University Gold Coast Campus, QLD 4222, Australia;4. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China;1. School of Civil Engineering, South West Jiaotong University, Sichuan, 610031, China;2. Key Laboratory of Theory and Technology of High-Speed Railway Structures, Ministry of Education, South West Jiaotong University, Sichuan, 610031, China;3. Griffith School of Engineering, Griffith University Gold Coast Campus, QLD 4222, Australia;4. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Centre for Marine Geotechnical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;3. Griffith School of Engineering, Griffith University Gold Coast Campus, Queensland, QLD 4222, Australia;1. School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou, 310023, China;2. College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing, 210098, China;3. School of Engineering and Built Environment, Griffith University, Gold Coast Campus, QLD, 4222, Australia;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;2. Griffith School of Engineering, Griffith University, Gold Coast, Queensland 4222, Australia;3. School of Engineering and Information Technology, Federation University of Austrilia, Ballarat 3353, Austrilia |
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| Abstract: | 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. |
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| Keywords: | Wave Liquefaction Loose sand deposit Pore pressure accumulation |
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