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<p>To evaluate the seismic reduction effects of NPR anchor rods in tunnels crossing fault zones, vibration table tests were conducted to obtain the model's acceleration and dynamic strain response characteristics under varying amplitudes of seismic waves. This study combined macroscopic phenomena with a multi-index evaluation method, defined the plastic strain coefficient, and elucidated the damage evolution of tunnel structures. The research findings indicate that seismic waves experience amplification effects when transmitted through the surrounding rock, leading to an increased acceleration response within the fault zone. The new NPR anchor rod material demonstrates effective shock absorption, resulting in reduced surrounding rock damage under the same level of seismic wave loading. The number and timing of peak acceleration amplitudes vary at different locations around the tunnel, indicating that the dynamic response of the tunnel structure—both locally and globally—is influenced by seismic waves across different frequency bands. By analyzing residual strain, we define the plastic strain coefficient and explore its relationship with the amplitude of input seismic waves. Furthermore, we categorize surrounding rock failure into three stages: elastic deformation, elastic–plastic deformation, and plastic deformation. These research findings provide valuable insights for understanding the deformation mechanisms and designing prevention and control measures for tunnels crossing fault zones.</p>

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Research on Seismic Performance Evaluation Method of NPR Anchor Cables for Tunnel Crossing Fault Seismic Zones

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Xiaoyu Zhang,
  • Zhigang Tao,
  • Xiaojie Yang,
  • Zhe Li

摘要

To evaluate the seismic reduction effects of NPR anchor rods in tunnels crossing fault zones, vibration table tests were conducted to obtain the model's acceleration and dynamic strain response characteristics under varying amplitudes of seismic waves. This study combined macroscopic phenomena with a multi-index evaluation method, defined the plastic strain coefficient, and elucidated the damage evolution of tunnel structures. The research findings indicate that seismic waves experience amplification effects when transmitted through the surrounding rock, leading to an increased acceleration response within the fault zone. The new NPR anchor rod material demonstrates effective shock absorption, resulting in reduced surrounding rock damage under the same level of seismic wave loading. The number and timing of peak acceleration amplitudes vary at different locations around the tunnel, indicating that the dynamic response of the tunnel structure—both locally and globally—is influenced by seismic waves across different frequency bands. By analyzing residual strain, we define the plastic strain coefficient and explore its relationship with the amplitude of input seismic waves. Furthermore, we categorize surrounding rock failure into three stages: elastic deformation, elastic–plastic deformation, and plastic deformation. These research findings provide valuable insights for understanding the deformation mechanisms and designing prevention and control measures for tunnels crossing fault zones.