Analysis Of Shock Absorption To The Centre Column Of Subway Station And Subway Tunnel Under Earthquake

Earthquake is an unpredictable and destructive natural disaster,which poses a serious threat to people's life.Our country is located in the Pacific earthquake zone,the plate movement is active,therefore,more attention should be paid on earthquakes.With the development of urbanization in recent years,a large number of people had flooded into cities,which had brought great traffic pressure on the city and promoted the rapid development of urban rail transit.However,lots of subway tunnels also brought great security risks to people's production and life especially under the unpredictable earthquakes,it is of great significance to improve the seismic capacity of subway tunnels.In this paper,based on background of Hefei subway,analyzed the damping effect of the lead-rubber isolation bearing on the center column of subway station under the influence of earthquake with the finite element software ANSYS,and analyzed the seismic isolation effect of the rubber isolation layer to the subway tunnel lining,the specific work and conclusions are as follows:Firstly,established two box-shaped subway station models with the effect of the earthquake,one adopted lead-core rubber isolation bearing and the other one without the bearing.The results showed that the lead rubber isolation bearing can greatly reduce the dynamic response of the center column and played the role of shock absorption.Secondly,established two subway tunnel models,one adopted rubber shock isolation layer and the other one without the isolation layer,and compared the dynamic calculation results of the two models.The results showed that the rubber isolation layer had the greatest influence on the tunnel displacement and could reduce the maximum displacement difference and the maximum principal stress peak of the tunnel lining.Thirdly,the influence of elastic modulus of rubber isolation layer on damping effect was further studied.The results showed that the smaller the elastic modulus,the better the damping effect to the tunnel lining.