Response of Porous Seabed to Nature Loadings: Waves and Currents
Publication: Journal of Engineering Mechanics
Volume 138, Issue 6
Abstract
In real ocean environments, currents generally exist simultaneously with ocean waves. However, the most previous investigations for the seabed response have only considered wave loading, ignoring currents. In this study, unlike previous studies, currents are included in the model of seabed response with waves, based on Biot’s poroelastic dynamic theory ( approximation). Numerical results reveal that the consideration of currents has significant effect on the seabed response. The opposing current is beneficial to prevent liquefaction, while the following current would worsen the stability of the seabed. The parametric studies indicate that the wave period, water depth, saturation, soil permeability, and thickness of the seabed significantly affect the seabed response under combined loading of waves and currents. The maximum relative difference of the pore pressure between the cases with currents (velocity is ) and without currents can reach up to 25% in both coarse and fine sand. The analysis of transient liquefaction in the fine sand seabed indicates that the maximum liquefaction depth increases with the following currents, but it decreases with the opposing current.
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Acknowledgments
We are grateful for the financial support from EPSRC Grant #EP/G006482/1 (UK), State Key Laboratory of Ocean Engineering Self-Development Grant #GKZD010053 (China), Sichuan University State Key Laboratory of Hydraulics and Mountain River Engineering Open Fund Scheme #SKLH-OF-1005(China), and NSFC Grant # 41176073 (China).
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© 2012. American Society of Civil Engineers.
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Received: Jun 26, 2010
Accepted: Nov 17, 2011
Published online: Nov 19, 2011
Published in print: Jun 1, 2012
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