Effect of Railway Tunnel Foundation Stiffness on Vibration Response of TunnelBuilding Integrated Structure

Abstract:

In order to study the effects of railway tunnel foundation stiffness on tunnel building integrated structure vibration response, the vehicle track tunnel soil building coupling dynamic model was established, and the reaction force of fasteners was used to transmit between vehicle track coupling dynamic model and tunnel soil building finite element model. The displacement, velocity and acceleration response of tunnel and building with the change of tunnel foundation stiffness was analyzed by the way of time history analysis, spectrum analysis and vibration level analysis. The results show as follows: the subsidence displacement decreases with the increasing of tunnel foundation stiffness furthermore, the discontinuity of velocity is exacerbated and the periodicity of velocity is weakened, but the correlation between amplitude of oscillation displacement and stiffness of tunnel foundation is not obvious. The vibration acceleration of tunnel is affected by the stiffness of tunnel foundation mainly in 1~5 Hz. The vibration of building structure changes with the stiffness of tunnel foundation, mainly in the low frequency level and the amplitude of variation can be 10 dB.

Key words:rail transit; foundation stiffness; tunnel building integrated structure; vibration; numerical simulation analysis