Response of the non-homogeneous saturated foundation to incident plane P-SV waves
Zhou Fengxi
Song Ruixia
Abstract：Based on Biot’s model for saturated porous media,the dynamic responses of non-homogeneous saturated soil was studied by using Helmholtz vector decomposition principle and exact dynamic stiffness method (EDSM) when P-SV wave was incident from bedrock.Reflection and transmission of incident plane P-SV wave in non-homogeneous saturated soil were analyzed considering the continuous variation of physical and mechanical properties about saturated foundation along the thickness direction.As a consequence,the general calculation formulas about the reflection coefficient and transmission coefficient of bedrock and free-field on the both surfaces were given.As numericalexamples,assuming that the material properties of the saturated foundationhad an exponential law distribution and gradient variation along the thicknesscoordinate,the dynamic response of non-homogeneous saturated soil and freefieldto incident plane SV was discussed.The numerical results indicate that theratio of ground displacement to bedrock displacement decreases with theincrease of the thickness and heterogeneity index of saturated soil,incidentangle and frequency of seismic wave.The vertical displacement ratio decreasesmore significantly than the horizontal one.The dissipation of seismic wavecaused by the thickness of soil layer is obvious,which all should be taken intoaccount in engineering practice especially on complex layered situations.
Keywords：saturated soilnon-homogeneousP-SV wavereflection and trans-missiondynamic responseexact dynamic stiffness method
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 629-639 )