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<p>To provide safe and efficient support for tunnels facing the risk of large deformation disasters, this study first analyzes the field monitoring data of a specific tunnel. The research aims to describe the deformation behavior and stress state of the support structure under rigid support conditions, thereby providing guidance for the optimization of the support structure. While rigid support can control the deformation of surrounding rock under high geostress, the stress state of the support system is highly unfavorable, leading to concrete cracking, spalling, and steel frame yielding. Consequently, this study proposes the application of thin-walled metal yield-pressure devices within the tunnel support system to develop a flexible support system. Numerical simulations are employed to analyze the mechanical behavior of this flexible support. The results indicate that the yield-pressure device effectively prevent steel frame yielding, increase the uniformity of stress distribution in the steel frame by over 77.53%, and enhance the safety factor of the initial support by more than 6.93%. Additionally, the shape of the plastic zone in the surrounding rock becomes more regular, and the self-bearing capacity of the surrounding rock is significantly improved under flexible support. On-site tests further demonstrate that the optimized flexible support has a excellent stress state.</p>

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Mechanical Behavior of Rigid Support and Flexible Support in Response to Large Deformation Disaster in Tunnel

  • 期刊论文

  • 发表日期：

    2025年3月22日

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  • Zheng Chen,
  • Song Ren,
  • Dong An,
  • Ping Zhang

摘要

To provide safe and efficient support for tunnels facing the risk of large deformation disasters, this study first analyzes the field monitoring data of a specific tunnel. The research aims to describe the deformation behavior and stress state of the support structure under rigid support conditions, thereby providing guidance for the optimization of the support structure. While rigid support can control the deformation of surrounding rock under high geostress, the stress state of the support system is highly unfavorable, leading to concrete cracking, spalling, and steel frame yielding. Consequently, this study proposes the application of thin-walled metal yield-pressure devices within the tunnel support system to develop a flexible support system. Numerical simulations are employed to analyze the mechanical behavior of this flexible support. The results indicate that the yield-pressure device effectively prevent steel frame yielding, increase the uniformity of stress distribution in the steel frame by over 77.53%, and enhance the safety factor of the initial support by more than 6.93%. Additionally, the shape of the plastic zone in the surrounding rock becomes more regular, and the self-bearing capacity of the surrounding rock is significantly improved under flexible support. On-site tests further demonstrate that the optimized flexible support has a excellent stress state.