Dynamic Response of Multilayered Silty Seabeds under Wave-Current Action in the Yellow River Estuary
Publication: International Journal of Geomechanics
Volume 18, Issue 6
Abstract
Few studies have focused on pore pressure and liquefaction in a layered silty seabed. This study investigated a silty seabed in the Yellow River Estuary. Based on Biot’s theory and further considering the influence of current, a numerical validation of two-dimensional seabeds under combined wave and current action was established with a quasi-static model. Based on this model, the dynamic response of five typical layered seabeds was explored under combined wave and current actions. The numerical results demonstrate a significant discrepancy in dynamic response. For instance, the distribution of the pore pressure versus the soil depth was found to be entirely different, especially for Seabed 1 and Seabed 4 (S1 and S4), where two peak values of the pore pressure occurred. Furthermore, considering the residual pore-pressure term in the liquefaction analysis, the liquefaction formed fastest in Seabed 5 (S5), and the maximum accumulative liquefaction depth was the greatest for Seabed 1 (S1), at slightly more than 8.5 m. In addition, the influences of waves and currents on the dynamic response of seabeds are discussed in parametric study, which indicates that waves and currents have a significant effect on the pore-pressure distribution. The relative differences in the maximum pore pressure for different currents, wave heights, and wave periods were found to be 27.8, 24.9, and 22.4%, respectively, of the maximum linear wave pressure P0 in Seabed 2 (S2).
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Grant 41572247) and the Science and Technology Research Projects of Shandong Province (Grant 2014GGX104007). Technical assistance from Prof. Hong-jun Liu is greatly appreciated.
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Published In
International Journal of Geomechanics
Volume 18 • Issue 6 • June 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Jun 8, 2017
Accepted: Oct 10, 2017
Published online: Mar 16, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 16, 2018
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