海洋场地Rayleigh波传播特性及其影响因素分析  

Analysis on Propagation Characteristics of Rayleigh Waves in Ocean Sites and Their Influence Parameters

作　　者：肖萌 崔杰[1] 李亚东[1] 江杰[3] 单毅 Duhee Park XIAO Meng;CUI Jie;LI Yadong;JIANG Jie;SHAN Yi;Park Duhee(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;College of Municipal Engineering,Guangdong Polytechnic of Water Resources and Electric Engineering,Guangzhou 510000,China;College of Civil Engineering,Guangxi University,Nanning 530004,China;Department of Civil and Environmental Engineering,Hanyang University,Seoul 04763,Korea)

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广东水利电力职业技术学院市政工程学院,广东广州510000 [3]广西大学土木工程学院,广西南宁530004 [4]汉阳大学环境与土木工程学院,韩国首尔04763

出　　处：《湖南大学学报（自然科学版）》2023年第5期191-203,共13页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51878192,52011530394,52020105002)。

摘　　要：为研究饱和弹性半空间中Rayleigh波在不规则海床的传播与衰减特性及其对海床的影响,结合Zienkiewicz给出的土动力学基本方程,建立了简化的不规则海底场地动力模型.通过改变边界条件,推导了水-土接触界面为平整界面时,有无上覆海水两个退化模型的Rayleigh方程,推演出了渗透系数、孔隙率、泊松比、界面条件等因素影响下不同场地条件中Rayleigh波的频散和衰减曲线,基于复杂海床模型,分析了各因素在Rayleigh波传播时对海床的孔压、变形等参数的动力响应影响规律.结果表明:土体参数、弹性模量、渗透系数、孔隙率,以及上覆水、水土交界面等因素均会影响海床的动力响应.不同Rayleigh波波速对土体力学参数沿土层深度的影响范围和影响程度不同;弹性模量和泊松比是决定土体性质的重要参数,是讨论Rayleigh波传播特性和土体动力响应的先决条件,它们的改变会改变渗透系数、孔隙率等参数的影响规律;在两个简化模型中,岩石地层E=6.017×10^(10) Pa,泊松比为0.38的条件下,孔隙率与渗透系数对Rayleigh波传播特性曲线有规律性影响.To study the propagation and attenuation characteristics of Rayleigh waves on the irregular seabed in saturated elastic half-space,a simplified dynamic model of irregular seabed sites is established with the fundamental equation of soil dynamics proposed by Zienkiewicz.By changing the boundary conditions,the Rayleigh equations are derived for the degradation model of uncovered seawater and overlying seawater when the water-soil contact inter⁃face is flat.And the dispersion and attenuation curves of Rayleigh waves under the influence of permeability coeffi⁃cient,porosity,Poisson's ratio,and interface conditions are given.Based on the complex sea bed model,the effect of various factors on the dynamic response of seabed parameters,such as pore pressure and deformation during Ray⁃leigh wave propagation,is analyzed.The results show that the soil mechanical parameters,such as elasticity modu⁃lus,permeability coefficient,and porosity,as well as the overlying water and the interface of sediment water,all af⁃fect the dynamic response of the seabed.The influence range and extent of different Rayleigh wave velocities on soil mechanical parameters differ along the soil depth.Elastic modulus and Poisson's ratio are important parameters that determine the properties of soil and are prerequisites for discussing the propagation characteristics of Rayleigh waves and the dynamic response of the soil.Their change affects the influence law of permeability coefficient,porosity,and other parameters.In the two simplified models,when the elastic modulus of the rock stratum is 6.017×1010 Pa and Poisson’s ratio is 0.38,the porosity and permeability coefficient have regular effects on the propagation charac⁃teristics of Rayleigh waves.

关 键 词：海洋场地 RAYLEIGH波 饱和两相介质 动力响应 

分 类 号：TU43[建筑科学—岩土工程]