Abstract
This study is aimed at numerically investigating the cnoidal wave-induced dynamics characteristics and the liquefaction process in a loosely deposited seabed floor in a shallow water environment. To achieve this goal, the integrated model FSSI-CAS 2D is taken as the computational platform, and the advanced soil model Pastor–Zienkiewicz Mark III is utilized to describe the complicated mechanical behavior of loose seabed soil. The computational results show that a significant lateral spreading and vertical subsidence could be observed in the loosely deposited seabed floor due to the gradual loss of soil skeleton stiffness caused by the accumulation of pore pressure. The accumulation of pore pressure in the loose seabed is not infinite but limited by the liquefaction resistance line. The seabed soil at some locations could be reached to the full liquefaction state, becoming a type of heavy fluid with great viscosity. Residual liquefaction is a progressive process that is initiated at the upper part of the seabed floor and then enlarges downward. For waves with great height in shallow water, the depth of the liquefaction zone will be greatly overestimated if the Stokes wave theory is used. This study can enhance the understanding of the characteristics of the liquefaction process in a loosely deposited seabed under coastal shallow water and provide a reference for engineering activities.
Highlights
It is found that the modulus of the cnoidal wave m ∈ (0, 1) is the key parameter dedetermining the waveform of the wave-induced pressure applied on the surface of the termining the waveform of the wave -induced pressure applied on the surface of the seaseabed floor
It is indicated by this phenomenon that the cnoidal wave-induced dynamics of a loose seabed floor is apparently complicated
This study comprehensively studied the loose seabed of both the dynamic characteristics and the residual liquefaction process under a cnoidal wave loading
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Cavallaro et al (2018) [2] and Idriss et al (2004) [3] investigated the liquefaction phenomena on seismic waves by laboratory tests and numerical simulations of saturated cohesive soils It has important research significance in science and engineering to study the dynamic characteristics and the liquefaction process of a loosely deposited seabed floor under the loading of extreme waves in a shallow water environment. There is still a lack of research work on the cnoidal wave-induced dynamics of a loosely deposited seabed floor and on the residual liquefaction in it in a shallow water environment. The integrated numerical model FSSI-CAS 2D is used as the calculation platform to comprehensively study the dynamic characteristics and progressive process of the residual liquefaction of the loose seabed under the action of cnoidal waves in a shallow water environment. This study improves the understanding and knowledge of its liquefaction process and provides valuable references for academic and practical communities
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