波浪作用下海床的有效应力分析  

Analysis of wave-induced effective stresses of seabed

作　　者：吴梦喜[1] 楼志刚[1] 

机构地区：[1]中国科学院力学所,北京100080

出　　处：《海洋工程》2002年第1期64-68,共5页The Ocean Engineering

基　　金：中科院‘九五’资源与环境重大项目资助 (K2 -95 1-A -4 0 5 )

摘　　要：波浪作用下海床的稳定性分析是海洋工程地质评价的重要内容。海床的稳定性可通过计算分析其随时间变化的有效应力场来评估。本文建议了一个周期荷载作用下土体的本构模型 ,并用于计算波浪作用下海床的应力与变形。采用Biot固结理论和有限单元法 ,分析了海床的动态应力场与孔隙水压力场。波浪作用下两种渗透系数时有效应力的动态变化过程结果对比 。Seabed stability under storm wave conditions is an important consideration in ocean engineering geology assessment. It can be assessed based on the analysis of effective stress field varying with time. A new elastic-plastic model framework is proposed to calculate the wave-induced seabed stresses,and the model parameters can be determined by un-drained triaxial dynamic shearing tests and triaxial unload texts. Biot′s consolidation theory and FEM (finite element method) are adopted. The comparison of effective stresses progression under different seepage coefficients indicates the accumulation and dissipation effect of pore pressure and their influence to the effective stresses.

关 键 词：本构模型 有效应力 孔隙水压力 波浪作用 海潮 渗透系数 

分 类 号：P731.22[天文地球—海洋科学]