Wave‐induced progressive liquefaction in a poro‐elastoplastic seabed: A two‐layered model

Abstract

SUMMARYIn this study, the prediction model proposed by Sassa et al. (Geotechnique 2001; 51(10):847-857) for the wave-induced progressive liquefaction in marine sediment, based on two-layered inviscid fluid system, is re-examined. An alternative approach with a similar framework of Sassa et al. (Geotechnique 2001; 51(10):847-857) is developed to correct the inappropriate mechanism of wave components used. Then, a two-layered wave model which includes viscous effects is established and applied to describe the progressive nature of wave-induced liquefaction. A comprehensive comparison shows that Sassa's model overestimates the maximum liquefaction depth. It is found that the viscosity of liquefied soil cannot be ignored and the solution for an infinite seabed is not suitable for liquefaction analysis of shallow seabed. A parametric study demonstrates the significant influence of numerous wave and soil characteristics on the liquefaction depth.

Effects of Principal Stress Rotation on the Fluid-Induced Soil Response in a Porous Seabed

“…This is why the predicted liquefaction depth in Figure 7 is large (up to 14 m). As reported in the literature regarding wave-induced post-liquefaction [20,62], the maximum liquefaction depth approaches a constant value when the concept of progressive liquefaction is taken into account. However, this concept is not included in the present model.…”

Numerical Study for Soil Response Around Submerged Breakwaters with Bragg Reflection

“…In other words, this study focus on the soil behaviour up to the onset of liquefaction. To predict the process of post-liquefaction, the model proposed by and Liu et al [2009] should be used. However, their models were based on one-dimensional approach, which is only valid for the wave-seabed interactions without a structure.…”

Momentary liquefaction of porous seabed under vertical seismic action

“…Generally, the pressure change of the water trapped in soil skeleton pore comes from external excitation such as ocean-waves and earthquake. The issue of ocean-waves induced seabed response and instability has attracted great attention from geotechnical and coastal engineers since 1970s [4][5][6][7]. The water waves propagating on the ocean could create significant dynamic wave pressure on the seabed surface and cyclic pore pressure in marine sediments [8].…”