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<p>Shading shacks are commonly installed in highway tunnels to alleviate sudden lighting variations at portal connections and decrease illumination energy demands. Nevertheless, their effects on longitudinal smoke propagation in adjacent tunnel networks during fire incidents remain poorly understood. This study investigates how shading shacks influence inter-tunnel pollutant transfer and develops a novel Shading Shack Smoke Control System (SSSCS) combining overhead smoke barriers with coordinated exhaust ventilation. Experimental-numerical analyses of 100&#xa0;m spaced twin tunnels reveal that conventional shading shacks restrict smoke diffusion in tunnel connectors while intensifying cross-tunnel contamination, with CO transfer ratios reaching 48%. The SSSCS demonstrates operational efficacy by improving visual clarity, suppressing CO transfer to 17%, and elevating evacuation safety indices. This systematic solution advances fire smoke management protocols for clustered tunnels equipped with shading infrastructure.</p>

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Study on Smoke Crossflow Characterization and Control in Highway Tunnel Groups with Shading Shacks

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Yuhao Li,
  • Hailin Wang,
  • Ruiqi Cheng,
  • Chuangang Fan,
  • Yaobei He,
  • Yu Li,
  • Zhengyang Wang,
  • Ao Jiao

摘要

Shading shacks are commonly installed in highway tunnels to alleviate sudden lighting variations at portal connections and decrease illumination energy demands. Nevertheless, their effects on longitudinal smoke propagation in adjacent tunnel networks during fire incidents remain poorly understood. This study investigates how shading shacks influence inter-tunnel pollutant transfer and develops a novel Shading Shack Smoke Control System (SSSCS) combining overhead smoke barriers with coordinated exhaust ventilation. Experimental-numerical analyses of 100 m spaced twin tunnels reveal that conventional shading shacks restrict smoke diffusion in tunnel connectors while intensifying cross-tunnel contamination, with CO transfer ratios reaching 48%. The SSSCS demonstrates operational efficacy by improving visual clarity, suppressing CO transfer to 17%, and elevating evacuation safety indices. This systematic solution advances fire smoke management protocols for clustered tunnels equipped with shading infrastructure.