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Date of Publication:2022-10-10

Journal:大连理工大学学报

Issue:5

Page Number:504-510

ISSN No.:1000-8608

Abstract:Liquefaction due to strong earthquake easily causes permanent displacement and strain of sloping sand layer in the fundament and induces the phenomena of flow slides,and then brings serious damages to the superstructure. Considering sloping sand layers' gradient, thickness, depth and seawater level synthetically, a two-dimensional offshore artificial island model was simulated numerically by FE-FD coupling finite element analysis method.The experimental results indicate that these four influence factors have different effects on the large deformation of artificial island in the course of seismic liquefaction.The influence of gradient is the greatest,and the influence of seawater level is the most non-obvious,and especially,its effect on excess pore water pressure is very small. Lateral spreading of artificial island j ust occurs after total liquefaction of saturated sloping sand layer in the course of seismic,which is a limit slide along the slope during a period of time.Its degree of damage is much bigger than that of damage induced by liquefaction of horizontal sand layer,and it easily causes serious differential settlement and damage of revetment of artificial island. These analytical results can provide reference for hazard evaluation of offshore engineering due to seismic liquefaction.

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