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<p>To address structural safety risks of tunnel linings with combined void and crack defects under complex geological and operational conditions, this study improved the dual‑horizon peridynamics method to support its engineering application in tunnel lining reinforcement. This study developed a high‑fidelity numerical model using a composite damage criterion that incorporated interface bond‑slip behavior between fiber‑reinforced polymer and concrete. The model used coordinate transformation, material property differentiation, and bond force adjustment to represent nonlinear interface interactions and mechanical responses of heterogeneous materials. The tunnel lining and surrounding rock models simulated conditions with different crack depths and void sizes. Comparisons of fiber‑reinforced polymer bonding, polymer grouting, and their combined use showed that polymer grouting filled voids, reduced local stress concentration, and restored the coordinated load‑bearing system. Fiber‑reinforced polymer bonding carried tensile stress, limited crack growth, and improved shear and tensile resistance. The combined method delivered clear synergistic performance. The study balanced computational efficiency and simulation accuracy, clarified damage evolution and reinforcement mechanisms, and provided a reliable reference for practical tunnel lining reinforcement design.</p>

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Bearing Capacity of FRP-Polymer Grouting Composite Reinforcement for Damaged Tunnel Linings Using Dual-Horizon Peridynamics

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Shiyi Xi,
  • Jun Liu,
  • Lei Gan,
  • Tugen Feng,
  • Yunyong He,
  • Binghan Xue,
  • Haibo Wang,
  • Wenbin Ye

摘要

To address structural safety risks of tunnel linings with combined void and crack defects under complex geological and operational conditions, this study improved the dual‑horizon peridynamics method to support its engineering application in tunnel lining reinforcement. This study developed a high‑fidelity numerical model using a composite damage criterion that incorporated interface bond‑slip behavior between fiber‑reinforced polymer and concrete. The model used coordinate transformation, material property differentiation, and bond force adjustment to represent nonlinear interface interactions and mechanical responses of heterogeneous materials. The tunnel lining and surrounding rock models simulated conditions with different crack depths and void sizes. Comparisons of fiber‑reinforced polymer bonding, polymer grouting, and their combined use showed that polymer grouting filled voids, reduced local stress concentration, and restored the coordinated load‑bearing system. Fiber‑reinforced polymer bonding carried tensile stress, limited crack growth, and improved shear and tensile resistance. The combined method delivered clear synergistic performance. The study balanced computational efficiency and simulation accuracy, clarified damage evolution and reinforcement mechanisms, and provided a reliable reference for practical tunnel lining reinforcement design.