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<p>This study presents a finite element investigation of tunnel-soil-tunnel interaction under internal blast loading. A three-dimensional finite element model was developed. Soil, concrete, and reinforcement were represented using the Drucker-Prager plasticity model, the concrete damage plasticity model, and the Johnson-Cook plasticity model, respectively. Blast loading was simulated using the CONWEP method. The influence of soil-tunnel interface behavior was evaluated under sliding contact conditions. Three tunnel spacing distances and three TNT charge weights (100, 200, and 300&#xa0;kg) were considered. Two detonation scenarios were analyzed, with the charge located at the midpoint of either the upper tunnel or the lower tunnel. Results indicate that, under sliding contact, tunnel response is largely insensitive to interface properties; the influence becomes noticeable mainly after the peak displacement. By contrast, tunnel spacing plays a dominant role. For the active tunnel, reduced spacing increases confinement and decreases deformation but amplifies stress concentration, whereas larger spacing promotes energy dissipation, resulting in slightly higher displacements and lower stress peaks. For the passive tunnel, both deformation and stress decrease as spacing increases. In addition, increasing charge weight significantly amplifies displacements and stresses in the tunnel linings and surrounding soil.</p>

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A Finite Element Analysis of Vertically Overlapping Tunnels Subjected to Internal Blast Loading

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Rida Bensailaa,
  • Mohamed Nadir Amrane,
  • Abderrahim Achouri

摘要

This study presents a finite element investigation of tunnel-soil-tunnel interaction under internal blast loading. A three-dimensional finite element model was developed. Soil, concrete, and reinforcement were represented using the Drucker-Prager plasticity model, the concrete damage plasticity model, and the Johnson-Cook plasticity model, respectively. Blast loading was simulated using the CONWEP method. The influence of soil-tunnel interface behavior was evaluated under sliding contact conditions. Three tunnel spacing distances and three TNT charge weights (100, 200, and 300 kg) were considered. Two detonation scenarios were analyzed, with the charge located at the midpoint of either the upper tunnel or the lower tunnel. Results indicate that, under sliding contact, tunnel response is largely insensitive to interface properties; the influence becomes noticeable mainly after the peak displacement. By contrast, tunnel spacing plays a dominant role. For the active tunnel, reduced spacing increases confinement and decreases deformation but amplifies stress concentration, whereas larger spacing promotes energy dissipation, resulting in slightly higher displacements and lower stress peaks. For the passive tunnel, both deformation and stress decrease as spacing increases. In addition, increasing charge weight significantly amplifies displacements and stresses in the tunnel linings and surrounding soil.