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Wave induced instantaneously-liquefied soil depth in a non-cohesive seabed
Qi WG(漆文刚); Gao FP(高福平)
Source PublicationOcean Engineering

Instantaneous liquefaction can be induced by the upward seepage force generated in a sandy seabed under wave troughs. The wave-induced pore-pressure distribution in the non-cohesive seabed with an instantaneously-liquefied layer is investigated analytically. Based on the analytical solution to Biot's consolidation equations for the response of a poro-elastic bed to water waves, the expressions of liquefied soil depth are derived with modifying the criterion for instantaneous liquefaction, which is verified with existing offshore field observations and multi-scale numerical simulations. Analytical investigation indicates that, in the instantaneously-liquefied soil layer, the buoyant weight of soil is essentially balanced by upward seepage force into a quasi-static state. Underneath the fully liquefied layer, the effective stress can be remarkably reduced. An excess pore-pressure ratio is then proposed to quantitatively evaluate the instantaneous liquefaction degree and its corresponding influential depth. Parametric studies indicate that, for a certain excess pore-pressure ratio, the influential depth decreases with increasing saturation degree, permeability of soil or water depth, but increases with increasing wave height. The influential depth of a non-cohesive seabed under waves increases significantly with reducing the threshold value of excess pore-pressure ratio, which may have much influence on the stability design for submarine structures.

Indexed BySCI ; EI
WOS IDWOS:000428824200034
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
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GB/T 7714
Qi WG,Gao FP. Wave induced instantaneously-liquefied soil depth in a non-cohesive seabed[J]. Ocean Engineering,2018,153:412-423.
APA Qi WG,&Gao FP.(2018).Wave induced instantaneously-liquefied soil depth in a non-cohesive seabed.Ocean Engineering,153,412-423.
MLA Qi WG,et al."Wave induced instantaneously-liquefied soil depth in a non-cohesive seabed".Ocean Engineering 153(2018):412-423.
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