LATERAL SEISMIC RESPONSE OF IMMERSED TUBE TUNNELS BASED ON TIME HISTORY ANALYSIS METHOD
Immersed tube tunnel projects often locate at the severe environment with seismic impact,therefore the seismic response analysis of which is extremely important.Based on engineering practice,this article establishes a fi-nite element analysis model to analyze the dynamic response laws of displacement and stress of immersed tube tun-nels under different foundation conditions,burial depths,and seismic intensities.The results show that as the peak acceleration increases,the horizontal and vertical displacement peaks of each structural point in the immersed tube tunnel continue to increase,but the changes in the time history curves of horizontal and vertical displacement are ba-sically consistent.When the soil layer of the tunnel foundation is relatively thin,the maximum axial force bending moment is located at the bottom plate of the tunnel.The deeper the tunnel is buried and the more it penetrates through the soil layer,the greater the internal force deformation.
immersed tube tunnelearthquake responsehorizontal displacementpeak accelerationinternal forces and deformations