Abstract During the process of shield tunnelling, there is a common problem with the local or overall uplift of the segments near the tail of the shield. To analyze the problem of segment uplift of shield tunnels during tunnelling,this paper addresses the foundation resistance coefficient in the longitudinal uplift analysis model for shield tunnels.Firstly, based on the characteristics of the overall uplift of the tunnel in the cross-section, this paper uses the elastic mechanics method to derive the theoretical solution of the foundation resistance coefficient by taking into account the influence of the grouting layer; secondly, based on an actual project, this paper compares and analyzes the differences in the foundation resistance coefficient when using this theoretical solution and the conventional calculation method, as well as their effects on the calculation results of the longitudinal uplift of the shield tunnel. The results show that the conventional calculation method significantly underestimates the foundation resistance coefficient, where the calculated values of the maximum uplift, the bending moment and the influence range of the tunnel are too large, while the calculated value of the shear force is too small.
Abstract：
During the process of shield tunnelling, there is a common problem with the local or overall uplift of the segments near the tail of the shield. To analyze the problem of segment uplift of shield tunnels during tunnelling,this paper addresses the foundation resistance coefficient in the longitudinal uplift analysis model for shield tunnels.Firstly, based on the characteristics of the overall uplift of the tunnel in the cross-section, this paper uses the elastic mechanics method to derive the theoretical solution of the foundation resistance coefficient by taking into account the influence of the grouting layer; secondly, based on an actual project, this paper compares and analyzes the differences in the foundation resistance coefficient when using this theoretical solution and the conventional calculation method, as well as their effects on the calculation results of the longitudinal uplift of the shield tunnel. The results show that the conventional calculation method significantly underestimates the foundation resistance coefficient, where the calculated values of the maximum uplift, the bending moment and the influence range of the tunnel are too large, while the calculated value of the shear force is too small.
WU Lin1,
2 WANG Wei2 FENG Kun2 TAO Weiming1 MENG Qinghui2 ZHEN Wenzhan1
.A Study on the Foundation Resistance Coefficient in Longitudinal Uplift Analysis Model for Shield Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(3): 128-135
2022, Vol. 59 