Study On Seismic Dynamic Response Of Double Arch Railway Tunnel In High Intensity Area

As a special form of tunnel structure,double arch tunnel has different dynamic characteristics during earthquake.Especially in high intensity seismic area,it is necessary to study the dynamic response rule of tunnel in earthquake.In this paper the West into a high iron Zhao Jialing double arch tunnel seismic dynamic corresponding rules using the finite element numerical simulation technology,the corresponding law of double arch tunnel is researched in detail.The main research contents include:1.According to the characteristics and failure characteristics of the seismic response,we discussed many factors affecting the seismic performance of the tunnel,including the depth of burial,the intensity of the earthquake,the direction of the seismic wave,the condition of the surrounding rock,and the structural mode of the tunnel.The dynamic constitutive model of soil soil and the elastoplastic model of soil are analyzed and studied.2.Many research methods for dynamic calculation and analysis method of the finite element calculation method of seismic wave input,selection,inversion,boundary,damping superposition,seismic wave filtering and calibration work,provide a strong basis for the soil structure interaction model.3.West high iron Zhao Jialing tunnel as background,the establishment of a 2-D finite element model in near field earthquake environment analysis of Shaanxi city in Han-Zhong Province Based on the three input line with soil types of seismic wave,and analyze the response of tunnel tunnel Zhao Jialing in the high intensity earthquake,the displacement of lining in the internal force and deformation of column etc..4.The establishment of three-dimensional model,the double arch tunnel,influence of buried depth,earthquake intensity,earthquake wave incident direction,surrounding rock,tunnel structure change on double arch tunnel seismic response by finite element analysis,the author summarized the corresponding parameters on the impact of the law of dynamic response of tunnel.Through the above research,we get the following conclusions:1.The Zhao Jialing double arch tunnel is located in the high intensity seismic area.The internal force and deformation of lining structure at the corner and invert is a weak link in the earthquake,so we need to enhance it locally.2.Double arch tunnel under the action of high intensity earthquake,the shallow buried and poor surrounding rock conditions(especially loose soil,large Poisson),the vertical incidence of seismic waves,the thickness of the middle column is too large or too small,is the most affected by the earthquake.