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Suppression of plug-holing phenomenon is important in tunnel design. Experimental analysis of the influence of crosssectional area ratio of tunnel and vertical shaft and heat release rate on plug-holing phenomenon in natural ventilation system. In the experiment model reduced to 1/20 size, the aspect ratio of the tunnel and vertical axis was fixed and the effect of plug-holing phenomenon was confirmed by changing the cross sectional area ratio between tunnel and vertical shaft. Experimental results show that the plugholing phenomenon is caused by the comparison of the smoke layer interface temperature and the temperature in the vertical shaft, and that the flow and temperature distribution under the vertical shaft changes with increasing cross-sectional area ratio of the tunnel and vertical vents . The plug-holing phenomenon is affected by the cross-sectional area ratio of the tunnel and vertical shaft. The larger the cross-sectional area ratio, the greater the possibility of plug-holing.

Influence of Cross-Sectional Area Ratio between Shaft and Tunnel and Heat Release Rate on the Plug-Holing Phenomenon in Natural Ventilated Tunnel Fire