Numerical investigation into the composite behaviour of over-deformed segmental tunnel linings strengthened by bonding steel plates

Zhai, Weifeng; Zhang, Dong Ming; Huang, Hongwei; Chapman, David

doi:10.1016/j.sandf.2023.101335

Cited by 6 publications

(1 citation statement)

References 25 publications

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“…Considering the nonlinear effects of the interaction between tunnel structures and soil, as well as the discontinuous features between tunnel segments, scholars have conducted a series of related studies based on Shanghai's soft soil conditions [1,15,20,[23][24][25][26]. However, their validation methods often rely on numerical simulation data and indoor test data from scholarly literature, making it difficult to assess internal forces and deformations under complex loading conditions for operational tunnels.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study Considering Discontinuous Longitudinal Joints in Soft Soil under Symmetric Loading

He,

Xu,

Yang

2024

Symmetry

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In shield tunneling, the joint is one of the most vulnerable parts of the segmental lining. Opening of the joint reduces the overall stiffness of the ring, leading to structural damage and issues such as water leakage. Currently, the Winkler method is commonly used to calculate structural deformation, simplifying the interaction between segments and soil as radial and tangential Winkler springs. However, when introducing connection springs or reduction factors to simulate the joint stiffness of segments, the challenge lies in determining the reduction coefficient and the stiffness of the springs. Currently, the hyperstatic reflection method cannot simulate the discontinuity effect at the connection of the tunnel segments, while the state space method overlooks the nonlinear interaction between the tunnel and the soil. Therefore, this paper proposes a numerical simulation method considering the interaction between the tunnel and the soil, which is subjected to compression rather than tension, and the discontinuity of the joints between the segments. The model structure and external load are symmetrical, resulting in symmetrical calculation results. This method is based on the soft soil layers and shield tunnel structures of the Shanghai Metro, and the applicability of the model is verified through deformation calculations using three-dimensional laser scanning point clouds of sections from the Shanghai Metro Line 5. When the subgrade reaction coefficient is 5000 kN/m3, the model can effectively simulate the deformation of operational tunnels. By adjusting the bending stiffness of individual connection springs, we investigate the influence of bending stiffness reduction on the bending moment, radial displacement, and rotational displacement of the ring. The results indicate that a decrease in joint bending stiffness significantly affects the mechanical response of the ring, and the extent and degree of this influence are correlated with the joint position and the magnitude of joint bending stiffness.

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