The maximum liquefaction depth of liquefiable seabed under wave loading

Large wave will cause liquefaction of seabed,and wave-induced liquefaction of seabed is a key problem of coastal and offshore engineering.Based on the Biot's theory of consolidation,taking account of both the criteria of liquefaction of oscillatory and residual pore pressures,the analytical solution of the maximum depth of porous sandy seabed under wave loading is derived in this study.With the new expression and the FLAC numerical simulation,an example is calculated,and the results are almost the same.The results of FLAC simulation show that the pore water pressure begins to build up and the effective stress of seabed goes down,when the wave force is loaded.When the effective stress reaches zero,the sediment is liquefied.Then the sediment grains are rearranged and compacted.Later,the residual pore pressure is dissipated,and the effective stress comes to rise.At last,the analytical solution and the numerical calculation are compared for various wave heights,wave lengths and water depths,and the outcomes are about the same,reflecting the regularity well of the liquefaction depth of seabed.