The Seismic Response Analysis Of Underground Cavities Based On Dynamic Constitutive Model Of Saturated Sands In Elasticity And Plasticity

Our country is a nation in which the probabilities of the happening of earthquake is very large,and many rigions lie in the places where buildings are required to have the ability to resist the earthquake.With the imorivement of the scale of underground structure's construction,the research of analysis of underground structure's seismic response and anti-seismic design of buildings is more and more valued.The thesis uses the dynamic constitutive model of saturated sandsoil in its elasticity and plasticity as the kernel theory and uses the dynamic finite element method and advanced language of program designing as primary means to make the dynamic finite element program, so that we can make an analysis and research in the seismic response of large tunnel.In this paper , firstly, we make a simple introduction of the status of seismic research and the status of soil dynamic mechanics. At the basis of correlative research, we make the explanation in-depth and the detailed theoretic deduction of the dynamic constitutive relation of saturated sandsoil in its elasticity and plasticity. At the basis of above analysis , The thesis supposes the TianJin tubelies in the saturated sandsoil and makes the timing analysis of seismic response of TianJin tube. This analysis mainly includes the mode analysis of the mutual action system of soil and structure and the dynamic response analysis of the system through using the dynamic constitutive relation of saturated sandsoil in its elasticity and plasticity. At the same time, in order to make a comparison with the result of dynamic constitutive theory, we also make a dynamic response analysis of the system through using the linear and elastic constitutive model. Through the analysis, we can get the changing rules of the water pressure of hole and the changing rules of displacement,stress and strain of the soil and structure.These rules and conclusions can provide the construction and designing of prospective actual projects with some gist and reference.