中文摘要：

波浪作用下粉质土海床的液化是影响海上平台、海底管线等海洋构筑物安全的灾害之一。在进行构筑物设计中应考虑海床液化的深度问题,而液化土体对下部海床的界面波压力是计算海床孔隙水压力增长以及液化深度的重要参量。本文基于波致粉土海床自上而下的渐进液化模式,利用双层流体波动理论,推导了考虑海床土体黏性的海床界面波压力表达式,并与不考虑黏性时的界面波压力进行了比较分析。结果表明,计算液化后土体界面波压力时,是否考虑液化土体的黏性对结果影响较大,进而可能影响粉质土海床液化深度的确定。

英文摘要：

The liquefaction of silty seabed is one of the disasters that would threaten the stability of offshore platforms,subsea pipelines and other marine structures.The boundary wave pressure caused by liquefied soil to the following seabed is a significant parameter when it comes to the calculation of pore water pressure and the liquefaction depth which should be taken into account during the structures design.Boundary wave pressure expressions with viscidity of seabed soil considered are deducted in this study,basing on the wave-induced silty seabed liquefaction top-down progressive mode and double fluid wave theory.The analysis of comparison with the boundary wave pressure without viscidity of seabed soil is also submitted.The results indicate that the viscidity of liquefied soil is agreat factor of influencing the boundary wave pressure,and then would affect the determination of the liquefaction depth.