波浪作用下渗透率各向异性的海床液化分析  

Analysis of Wave-Induced Liquefaction of Seabed with Variation in Permeability Anisotropy

作　　者：荣富 廖晨聪 童大贵 周香莲[1] RONG Fu;LIAO Chencong;TONG Dagui;ZHOU Xianglian(Department of Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学土木工程系,上海200240

出　　处：《上海交通大学学报》2019年第1期93-99,共7页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金重点项目(41330633);国家自然科学基金青年科学基金(41602282)资助项目

摘　　要：为探究波浪荷载作用下渗透率各向异性的海床的瞬态液化问题,分别以雷诺平均Navier-Stokes(RANS)方程和Biot多孔弹性方程作为波浪运动和海床响应的控制方程,采用LSM (LevelSet Method)法对自由表面进行追踪,以保证波浪运动模拟的准确性,并建立了波浪-海床相互作用的二维耦合数值模型.在验证数值模型合理性的基础上,进一步分析了波浪参数、海床土体的饱和度和渗透性对海床瞬态液化的影响.结果表明:波浪参数和海床土体饱和度对海床瞬态液化的影响显著;海床的瞬态最大液化深度随着波浪的高度、周期的增大而增加,随着海床土体饱和度的增大而减小;相比于海床土体的水平方向渗透系数,海床的瞬态最大液化深度对垂直方向渗透系数的变化更加敏感.In order to investigate the wave-induced seabed liquefaction with variation in permeability anisotropy,a two-dimensional integrated model for wave-seabed interactions was proposed in this paper.In the model the Reynolds-Averaged Navier-Stokes(RANS)equations and the Biot’s poro-elastic equations were taken as the governing equations for the wave model and seabed model respectively.The level set method(LSM)was used to track the free surface of water for modeling wave motion accurately.After the feasible of the present models were validated,the effects of wave parameters,soil saturation and permeability on the seabed liquefaction with variation in permeability anisotropy were further discussed.The analysis results indicated that both the wave parameters and soil saturation of seabed can significantly affect the wave-induced seabed liquefaction and the depth of maximum transient liquefaction of seabed increases with the increment of wave height,wave period and the decrement of degree of soil saturation.Maximum transient liquefaction of seabed depth is more sensitive to the variations of the permeability in vertical direction than the horizontal permeability.

关 键 词：海床 波浪 RANS方程 BIOT固结理论 渗透率各向异性 瞬态液化 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]