Seismic Analysis And Application Of Seismic Construction Measures In Metro Stations And Sections

The response of underground structures to earthquakes is an important part of ensuring the safety and stability of subway in subway design.Based on the engineering background of an underground station and underground section of Nanjing Metro,aiming at the stability of underground space structure under earthquake action,this paper systematically studies the internal force and structural deformation of underground space structure under earthquake action by using static analysis method,response displacement method,two-dimensional time history analysis method and dynamic time history analysis method..The main work and achievements of the paper are as follows:(1)Taking an underground station and underground section of Nanjing Metro as the engineering background,the feasibility of metro construction is analyzed from the aspects of engineering geology and hydrogeology under the geological evaluation index,stability evaluation index and seismic design index.(2)Taking an underground station of Nanjing Metro as an engineering background,the equivalent static calculation,seismic calculation by response displacement method and dynamic time history calculation of the station are carried out by using finite element software,and the most disadvantageous position of structural deformation and stress is obtained.By comparing the results of dynamic time history analysis with those of static calculation method and response displacement method,the seismic design performance of internal force and structural deformation of underground station structure is evaluated,and it is concluded that the structural design of underground station structure meets the seismic performance I requirement under fortified earthquake action,and that the structural design meets the seismic performance I requirement under rare earthquake action.II requirements for seismic performance.(3)Taking an underground section of Nanjing Metro as an engineering background,seismic analysis and calculation are carried out by static analysis method and time history analysis method.It is found that the most disadvantageous locations of deformation and stress are the top,shoulder and left and right sides of the tunnel.(4)In order to improve the shear and flexural bearing capacity of the structure under earthquake,the seismic structural measures of the engineering structure are designed according to the weak points of structural deformation and stress in the seismic analysis of the above-mentioned metro stations and sections.Based on the results of seismic analysis of an underground station and underground section of Nanjing Metro,this paper provides a very meaningful reference value for the construction of Metro in areas with little difference in geological conditions in practice.In addition,the traditional and typical seismic analysis methods are used for comprehensive comparative analysis,which can also be used as a phase.The researchers provide some valuable research ideas.