Dynamic Soil-structure Interaction For Transversely Isotropic Material Model

Dynamic soil-structure interaction has always been an important subject in structural engineering,earthquake engineering,disaster prevention and mitigation engineering and protection engineering.At present,most of the studies on soil-structure dynamic interaction are based on the assumption of isotropic media.However,soil exhibits obvious anisotropy under natural weathering and deposition process,so it is more valuable for engineering practice to use transverse isotropic media model to study..In this paper,an indirect boundary element method(IBEM)is used to study the dynamic soil-structure interaction in three-dimensional TI layered half-space.In addition,in order to extend the research to the the TI saturated material,the green's function in three-dimensional TI saturated half-space is derived in this paper.The main works achieved are as follows:1.The dynamic stiffness coefficient of the semi-spherical foundation and displacements of the foundation and the system with single degree of freedom(SDOF)are solved by the indirect boundary element method(IBEM)based on the three-dimensional layered TI half-space oblique Green's function.The correctness of the results is verified by comparing with the results of existing literature.Through the analysis of examples,some conclusions are drawn in this paper:the change of TI medium parameters has significant influence on displacements of the foundation and the system with single degree of freedom(SDOF),considering the anisotropy of soil,the displacement of foundation and superstructure will change,which is mainly reflected in the peak displacement.For example,when the qP wave incident at an angle of 60~0 in the horizontal direction,the peak value of the foundation angular displacement increases by 29.51%,and the peak value of the single particle structure angular displacement increases by 19.85%.Therefore,the effect of soil anisotropy on soil-structure interaction should be considered.2.Based on the whole stiffness matrix for TI saturated layered half-space,the green's function for incline plane uniformly distributed load is derived.The correctness of the green function is verified by comparing with the results of existing literature.Through the analysis of examples,some important conclusions are drawn in this paper:The variation of parameters of TI saturated medium will affect the distribution of displacement and stress along depth and surface under inclined and pore pressure loads.In addition,this paper compares the pore pressure distribution of different soil thickness,buried depth and elastic modulus ratio,and finds that buried depth has the greatest influence on pore pressure.