Analysis on Vibration Characteristic of Metro Tunnel Structure based on Moderately Thick Cylindrical Shells Theory

Taking metro tunnel in soil as research background, at first, according to the theory of moderately thick cylindrical shells considering transverse shear deformation, the vibration equation of tunnel structure was established, secondly, the motion equation of soil around the tunnel was set up with use of Navier’s wave theory of homogeneous, isotropic, linear elastic media, based on these, taking advantage of the wave propagation approach, the vibration control equation of tunnel structure considering soil-structure dynamic interaction was established through the interface continuous conditions, and then, by making use of its dispersion characteristic equation, analysis on vibration characteristic of the tunnel structure was carried out, which validate the effectiveness of the equation gained above by compared with the corresponding results obtained by using the thin shell theory and the finite element method. Furthermore, the influence of radius, wall-thickness, length and buried-depth of the tunnel on the vibration characteristics of the structure were also analyzed.