Abstract
This paper examines variations in void ratio profiles of an initially loosely packed deposit of sand in the course of wave loading history. The aim of this particular study is to shed some light on the effect of wave-induced densification upon the liquefaction resistance to the subsequent wave loading. A theoretical discussion is made of the way in which liquefied zone extends during wave loading and densification ensues. This is followed by studies of results from a set of centrifuge tests that comprised an upward seepage flow stage, a wave loading stage and a consolidation stage. The void ratio profiles with depth of the sand bed were determined through profiles of the coefficient of permeability which were measured in the steady-state stage of upward seepage flow. The predicted and experimental results indicate that a liquefied zone underwent appreciable densification in the subsequent consolidation stage, and that the rate of the densification was most marked in a region directly above the location of the liquefaction front.
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