【摘要】 波流共同作用下双层砂质海床的稳定性,目前集中于对其瞬态液化特征的研究,由于海床瞬态液化深度一般较小,难以全面反映双层砂质海床的液化特征,故有必要对其累积液化特征进行分析。基于海床累积孔隙水压力发展控制方程,利用Comsol Multiphysics有限元分析平台,对波流耦合作用下双层砂质海床的累积液化特征进行了分析。结果表明,顺流会增大海床的液化深度,考虑到海床的累积液化效应,实际海况中的较大流速不容忽视;上下层海床的渗透系数及其相对厚度对双层海床的累积液化特征有重要影响。更多还原

【Abstract】 Most previous literature has focused on the characteristics of wave and current-induced transient liquefaction in two-layered sandy seabed.However,the transient liquefaction depth is relatively small,which is difficult to reflect the overall characteristics of liquefaction in two-layered sandy seabed.It is essential to analyze the characteristics of residual liquefaction in two-layered sandy seabed under wave and current loadings.Based on the governing equation of residual pore water pressure generation,using software of Comsol Multiphysics,the numerical model was built to analyze the characteristics of residual liquefaction in two-layered sandy seabed under wave and current loadings.Simulation results have revealed that the following current aggravates the liquefaction depth.The influence of relatively larger velocity on seabed liquefaction is indispensable when the residual liquefaction effect is concerned.The permeability coefficients and the relative thickness of upper and lower layers have an important influence on the characteristics of residual liquefaction in two-layered sandy seabed.更多还原