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Amplification of Love Waves by Cavities in a Layered Half-Space

Author: WangYunYan
Tutor: LiangJianWen
School: Tianjin University
Course: Structural Engineering
Keywords: Layered half-space Love waves Direct stiffness method Green's function Indirect Boundary Element Method Dispersion Attenuation
CLC: TU435
Type: Master's thesis
Year: 2007
Downloads: 34
Quote: 0
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Abstract


With the recent increase in underground construction site in the seismic response gradually attracted attention . To study wave spread Layered great significance both in theory and in practical engineering . JPWolf establish accurate dynamic stiffness matrix of elastic soil , as well as linear distributed load acting on the Green's function of tilt angle straight line power , forming horizontal Elastic Strata dynamic response and dynamic soil - structure more complete theory of the interaction . How to apply the theory to solve Layered cavern opposite wave Love wave amplification will focus on solving the problem of this topic . In this paper, the indirect boundary element method , layered half-space in a cavity in the Love wave amplification problem is solved in the frequency domain . Free field response analysis , obtained units imaginary cavern boundary on the stress response . Then a virtual distributed load is applied on each unit in the cavern boundary , obtained the Green's function of displacement and stress . Finally, according to the stress boundary conditions to determine the value of virtual distributed load displacement response of the free-field and virtual distributed load generated response superimposed together , we get the answers to your questions . Free movement outside the plane of the layered venues field reflects the analysis using the direct stiffness method . Were given a half-space on a single soil layer and half-space the multilayer soil two site conditions under Love wave dispersion and attenuation characteristics , as well as the SH wave Love wave site amplification effects . Using indirect boundary element method to study and discuss a single soil layer and the elastic half-space elastic layered half-space multi-layered soil amplification Love waves , pointed out the necessity and reasonableness of the use of a layered model . Further comparison of the single cavity and two caverns under the conditions of different amplification . The proposed method can be used for the dynamic analysis of the subway and underground engineering .

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Soil Mechanics > Soil Dynamics and Vibration foundation
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