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  Segments Floating During Shield Tunneling Considering the Influence of Dynamic Construction Steps

  The buoyancy generated by synchronous grouting is an important factor that causes the tunnel segment to float during the construction period. Considering the variety of grout viscosity and the effect of grout pressure dissipation, the buoyancy tends to decrease nonlinearly with grouting time, and the upward floating state of the segment will also be changed. Based on the improved Winkler semi-infinite beam foundation, this paper established an analytical model of the tunnel segment during the construction period, taking into account the timevarying viscosity of synchronous grouting slurry and the dynamic influence of shield tunnelling. The calculated results of the model were compared with the monitoring results of a river road tunnel in China. The result shows as follow: if considering the influence of slurry viscosity and construction step, the longitudinal buoyancy distribution was approximately parabolic, and the floating process of tunnel segments was gradually cumulative. The theoretical value was closest to the measured value.

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