Study on the Stiffness Efficiency and Bending Moment Transferring Coefficient of the Hexagonal Tunnel

  • Zhang Hongwei ,
  • Cheng Xuesong ,
  • Guo Lin
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  • 1. China Railway Shanghai Design Institute Group Co., Ltd., Tianjin Branch, Tianjin 300073, P.R. China;
    2. School of Civil Engineering, Tianjin University, Tianjin 300072, P.R. China

Received date: 2024-12-18

  Online published: 2025-10-17

Abstract

The hexagonal tunnel has the advantages of better deformation and mechanical performance, and the space utilization ratio is better than that of the circular tunnel. But it's still a lack of research on the performance comparison and corresponding design parameters under different types of assembly forms. In order to explorer the performances of the transverse effective rigidity ratio of the hexagonal tunnel, stagger-jointed, straight-jointed and uniform models are investigated based on model tests and similarity theories. The experiment results are verified by numerical simulation. On this basis, numerical models are used to further study the bending moment distribution of the three models, and the bending moment transferring coefficient of stagger-jointed structure is calculated. The results show that: The transverse effective rigidity ratio is between 0.85 and 0.89 under stagger-jointed condition, and significantly better than that between 0.62 and 0.68 under straight-jointed condition. The bending moment distribution and bending moment transferring coefficient of staggered joint structure change periodically. The bending moment transferring coefficient is between 0.18 and 0.36. The results can be used as a reference for the design of hexagonal tunnel.

Cite this article

Zhang Hongwei , Cheng Xuesong , Guo Lin . Study on the Stiffness Efficiency and Bending Moment Transferring Coefficient of the Hexagonal Tunnel[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(5) : 1729 -1739 . DOI: 10.20174/j.JUSE.2025.05.29

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