Analytical investigation of the shield-soil rotary friction on tunnelling-induced ground mechanical reactions

Shield-soil rotary friction is one of the reasons that cause asymmetrical settlements about the central axis of tunnel center line. This paper focuses on analytical analysis of the shield-soil rotary friction on tunnellinginduced ground mechanical reactions. According to the working principle of the shield machine, the way and process of the shield torque acting on the soil is proposed. Based on the calculation model of a spatial curved shield tunnel and the rewritten of the Mindlin solutions, this paper derives the analytical solutions of the effect of shield-soil rotary friction on the soil displacement field and the additional stress field, respectively. The derived theoretical solutions are verified and compared with the shield project of Beijing East Sixth Ring Road renovation project, and relevant parameters are analyzed in this paper. The numerical model analysis based on the finite element software and the field monitoring data verify the correctness of the method proposed. The theoretical study in this paper further improves the study of the construction load of shield machine.