Abstract
This paper investigates the longitudinal behavior and failure pattern of shield tunnel, as well as the reinforcement mechanism of longitudinal channel steel, using reduced-scale tunnel models assembled with 24 lining rings. The longitudinal behavior of the shield tunnel and the reinforcement effect are discussed in terms of vertical deformation, joint deformation, and concrete cracking. The results indicate that the shield tunnel without reinforcement longitudinally deforms in a “bending and dislocation” mode, with the failure pattern dominated by bending deformation. In contrast, the failure pattern of the shield tunnel reinforced by channel steels is characterized by brittle shearing dislocation fracture of the circumferential joint. The load at which damage occurs in the reinforced tunnel model is 1.74 times and 2.04 times that of the non-reinforced staggered and straight jointed tunnels. The reinforcement reduces the horizontal convergence discrepancy of lining rings above the soft foundation spring and the adjacent lining rings, which improves the overall integrity of the tunnel structure.
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Acknowledgments
The author would like to acknowledge the support from the National Natural Science Foundation of China (Grant No. 51878296) and the State Key Laboratory of Subtropical Building and Urban Science. In particular, the authors wish to thank Prof. Shimin Wang for his valuable suggestions on the design of model experiments.
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Liu, T., Zhang, S., Tang, Y. et al. Experimental Study on the Longitudinal Mechanical Behavior of Shield Tunnel in Soft-Hard Uneven Strata and the Reinforcement Effect of Longitudinal Channel Steel. KSCE J Civ Eng 28, 409–427 (2024). https://doi.org/10.1007/s12205-023-2252-9
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DOI: https://doi.org/10.1007/s12205-023-2252-9