Calculation of longitudinal bending moment and shear force for Shanghai Yangtze River Tunnel: Application of lessons from Dutch research

Conclusions from a published longitudinal beam action calculation of the tunnel lining at the Shanghai Yangtze River Tunnel (SYRT) are evaluated against experience gained in Dutch research on longitudinal beam action. The former aimed at quantifying the shear force in the tunnel lining during the construction phase of the tunnel in relation to the grouting process. For evaluation of calculated shear forces, a recently developed one-dimensional beam action model is applied. The paper compares the principles of the two calculation methods and the outcomes. Massive shear forces were predicted in the original calculations for the SYRT, whereas these are much smaller according to this recent model. This is attributed to differences in the treatment of boundary conditions, particularly regarding the longitudinal bending moment in the tunnel lining. It is advised to devise a method to measure the shear force that is transmitted by the set of hydraulic jacks between the TBM and the tunnel lining.

► Use of an analytical beam action model for a tunnel lining during construction.
► Application of lessons from Dutch research and monitoring.
► Different approaches for grout modelling and connection of tunnel lining with TBM.