Computational Analysis on Longitudinal Equivalent Bending Stiffness under the Influence of Shield-tunnel Transverse Deformation

摘要

In order to study the lining longitudinal deformation rule under the influence of the lining transverse deformation in the process of long-term settlement of operating metro shield tunnel with straight joint, based on the field test monitoring data of Tibet Road-Zhongxing Road shield tunnel in the M8 of shanghai, and considering the tunnel convergence, this problem is studied by amending equivalent continuous model. Then there is a comparison between the existing theoretical methods and this calculation method. The results showed that, in the ring joints, no considering shearing, the maximum of ring joint open, the tension and compression stress of segment, and bolt stress slightly decrease with the increase of deformation of tunnel convergence under the bending. The smaller the curvature radius of the shield-tunnel longitudinal deformation is, the larger the ring joint open under the influence of tunnel convergence is.