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<p>Differential fault movement induced deformation and damage in track structures within fault-crossing tunnels. To reveal the response mechanism of the track system, a coupled numerical model of the track–tunnel–surrounding rock system was established using the concrete damaged plasticity model and cohesive zone model. A non-uniform excitation method was adopted to simulate fault-induced surrounding rock movement and relative dislocation. The results indicated that track irregularity, structural plastic damage, and interlayer debonding increased with excitation intensity. The central region of the track slab near the footwall showed the most severe response. Under an excitation level of 0.5R, the maximum concrete damage variable reached 0.8. Interlayer debonding occurred at locations of maximum downward curvature, with limited separation but extensive damage. The interlayer damage variable approached 1.0 in most affected regions, and the damaged area reached 78&#xa0;m². When the excitation level increased to 2.5R, the damaged area exceeded 160&#xa0;m². The results characterized the evolution of structural damage and interlayer failure under fault-induced dynamic loading. This study provides a reference for the seismic design, maintenance, and interface configuration optimization of track structures in fault-crossing tunnels.</p>

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Mechanical Behavior of Ballastless Track in Tunnel Crossing Fault Section Under Non-Uniform Excitation

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Xuhao Cui,
  • Xiaolong Ren,
  • Hong Xiao,
  • Hongbin Xu,
  • Yan Xiao,
  • Rui Zhou,
  • Yanliang Du

摘要

Differential fault movement induced deformation and damage in track structures within fault-crossing tunnels. To reveal the response mechanism of the track system, a coupled numerical model of the track–tunnel–surrounding rock system was established using the concrete damaged plasticity model and cohesive zone model. A non-uniform excitation method was adopted to simulate fault-induced surrounding rock movement and relative dislocation. The results indicated that track irregularity, structural plastic damage, and interlayer debonding increased with excitation intensity. The central region of the track slab near the footwall showed the most severe response. Under an excitation level of 0.5R, the maximum concrete damage variable reached 0.8. Interlayer debonding occurred at locations of maximum downward curvature, with limited separation but extensive damage. The interlayer damage variable approached 1.0 in most affected regions, and the damaged area reached 78 m². When the excitation level increased to 2.5R, the damaged area exceeded 160 m². The results characterized the evolution of structural damage and interlayer failure under fault-induced dynamic loading. This study provides a reference for the seismic design, maintenance, and interface configuration optimization of track structures in fault-crossing tunnels.