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<p>This paper presents the results and analysis of tunnel face behavior reinforced by longitudinal pipes. A 3D finite element model was used to simulate the behavior of the near-face region during tunnel excavation in elastoplastic ground, following the Mohr–Coulomb failure criterion. A parametric analysis was performed to investigate the effects of various reinforcement parameters on tunnel face deformation. These parameters included pipe density (N/<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{m}}^{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mtext>m</mtext> </mrow> <mn>2</mn> </msup> </math></EquationSource> </InlineEquation>), length, reinforcement force distribution, cover depth ratio (H/D), soil cohesion (c), friction angle (Φ), reinforcement rigidity, and reinforcement area. The results demonstrate that adopting the fiberglass longitudinal reinforcement technique can significantly enhance face stability, reducing deformation. The study also identifies critical values for several important parameters in the FG reinforcement technique, relevant to both shallow and deep tunnels.</p>

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Numerical Parametric Study on Deformation of Tunnel Face Reinforced by Longitudinal Fiberglass Pipes

  • 期刊论文

  • 发表日期：

    2025年4月19日

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  • Mohammed Moeen Habib,
  • Mohamed Abdallah El-Khouly

摘要

This paper presents the results and analysis of tunnel face behavior reinforced by longitudinal pipes. A 3D finite element model was used to simulate the behavior of the near-face region during tunnel excavation in elastoplastic ground, following the Mohr–Coulomb failure criterion. A parametric analysis was performed to investigate the effects of various reinforcement parameters on tunnel face deformation. These parameters included pipe density (N/ \({\text{m}}^{2}\) m 2 ), length, reinforcement force distribution, cover depth ratio (H/D), soil cohesion (c), friction angle (Φ), reinforcement rigidity, and reinforcement area. The results demonstrate that adopting the fiberglass longitudinal reinforcement technique can significantly enhance face stability, reducing deformation. The study also identifies critical values for several important parameters in the FG reinforcement technique, relevant to both shallow and deep tunnels.