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The consolidation state of submarine soils is very important for the study of erosion, sifting and mass transport. In marine conditions, sediment bear complex natural stresses and specially cyclical stresses. This paper deals with the effect of cyclical water pressure due to tide on the effective stresses in the soils. The one dimensional mechanical analysis take account of the presence of gas and the behaviour is considered elastic in a narrow range of stresses. The study involves the use of the boundary layer thickness, the maximum liquefiable thickness and the liquefied layer thickness. The dynamical effective stress is shown to be important in some cases with unsaturated soils, so the effective stress con be negative in a limited area at the top of the sediment, called the liquefied layer. The results are applied to some type of soils like sand, silt, clay... A schematic graph shows that for a saturation ratio near 98% sand type soils are not liquefied, but soft mud, like the sediment of Lorient, may undergo an important liquefaction under tide action.

Possibilité de liquéfaction d'un sol immergé sous l'action de la marée