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  The Effect of Tunnel Ring Joints on the Dynamic Responses from Underground Tunnels

  Most underground railway lines are constructed by the shield method, resulting in the periodic jointed characteristic of tunnel structure in the longitudinal direction. A new analytical method is proposed in this study to investigate the effect of the tunnel ring joint on the dynamic responses from underground tunnels. The tunnel rings are conceptualized as cylindrical shells, and the tunnel ring joints are modelled as a series of springs with continuous supports around the circumference. The soil surrounding the tunnel is simulated using the elastic continuum theory. By applying the periodic-infinite structure theory, the solution for a harmonic moving load applied to the periodic jointed tunnel is obtained. The tunnel is subsequently coupled with the surrounding soil via the boundary conditions on the tunnel-soil interface. The numerical results show that the existence of the tunnel ring joint has a significant effect on the soil vibrations.

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