Seismic Response Analysis Of Shield Tunnel

Japan's kobe earthquake in 1995 opened a new page of underground seismic issues, in the strong earthquake we can no longer stubborn the underground structure is safe because of the constraint from the rock, so it allows a clear understanding of engineering to seismic performance of underground structures that we need to strengthen research and a re-evaluation. But there is no corresponding implementation detail on the seismic design of tunnel in the typical fields of marine soil. Therefore, to study the dynamic response and its influencing factors is very meaningful. In the paper, on basis of a nuclear power plant expansion project, it analyses the seismic response of tunnel in the marine soil, in order to get some valuable patterns of dynamic response.The main work includes:Firstly, the paper introduces the background and significance of the seismic response analysis of shield tunnel, summarizes its research status simply, and proposes the problem;In chapter two, the paper designs more suitable geology and the corresponding parameters based on a drainage project of a nuclear power plant, simplifies the water level and the actual site conditions. In the static calculation of foundation soil, it uses midpoint increment method and adopts Duncan-Zhang E-B model; in the dynamic calculation, it uses parity linear method and adopts equivalent linear model. Combine basic knowledge of finite element with computer programs, it introduces the process of static and dynamic finite element analysis, the parameter for calculation, the developing and solving of dynamical equation, the simulating of earthquake motion, the processing of boundary and so on. The chapter foreshadows the 2D and 3D dynamic response analysis of the lining;In the chapter three, it builds 2D FEM model of the tunnel and calculates, including static and dynamic. In the chapter, it summarizes the stress and deformation of the tunnel lining in the different typical marine soil, different depth, different pipe thickness, stiffness of joints and the vertical seismic force, analysis the dynamic response of such hydraulic tunnel and the related impact factors;And in the chapter four, to study the influence of the stress and deformation of the tunnel lining in marine condition more, it builds 3D FEM model of the tunnel for numerical calculation. In the dynamic calculation, it uses parity linear method and adopts equivalent linear model to get the compatibility of the tunnel lining and marine condition.According to the 2D and 3D dynamic response analysis of the lining, the dynamic repoonse laws offer project gist.