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<p>Urban underground transportation systems are vital for addressing rapid urbanization but remain vulnerable to dynamic loads, such as accidental explosions. This study investigates the stability of single-track twin tunnels under blast loading using three-dimensional finite element analysis. Multiple models assessed structural stability, quantified damage potential, and analyzed critical parameters, including explosive charge, inter-tunnel distance, burial depth, groundwater table level, lining stresses, and peak particle velocity (PPV). The influence of soil properties—specifically internal friction angle and unit weight—was also evaluated. Results demonstrate that variations in soil internal friction angle negligibly impact induced stresses and PPV. Conversely, increased soil unit weight reduces these parameters due to enhanced damping. A deeper groundwater table significantly increases displacements and PPV. Reduced burial depth correlates with increased PPV and displacements in the primary tunnel, while the adjacent tunnel experiences decreased values due to proximity to the surface. Vertically aligned tunnel configurations heighten PPV levels. Predictive equations for PPV in tunnel linings under varying explosive charges are proposed. These findings contribute to improved design methodologies for blast-resilient twin-tunnel infrastructure.</p>

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Numerical Investigation of Tunnel-to-Tunnel Blast Effects Based on PPV Variations

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Fazel Mehryar,
  • Nader Hataf

摘要

Urban underground transportation systems are vital for addressing rapid urbanization but remain vulnerable to dynamic loads, such as accidental explosions. This study investigates the stability of single-track twin tunnels under blast loading using three-dimensional finite element analysis. Multiple models assessed structural stability, quantified damage potential, and analyzed critical parameters, including explosive charge, inter-tunnel distance, burial depth, groundwater table level, lining stresses, and peak particle velocity (PPV). The influence of soil properties—specifically internal friction angle and unit weight—was also evaluated. Results demonstrate that variations in soil internal friction angle negligibly impact induced stresses and PPV. Conversely, increased soil unit weight reduces these parameters due to enhanced damping. A deeper groundwater table significantly increases displacements and PPV. Reduced burial depth correlates with increased PPV and displacements in the primary tunnel, while the adjacent tunnel experiences decreased values due to proximity to the surface. Vertically aligned tunnel configurations heighten PPV levels. Predictive equations for PPV in tunnel linings under varying explosive charges are proposed. These findings contribute to improved design methodologies for blast-resilient twin-tunnel infrastructure.