Field fire test on smoke flow characteristics of V-slope tunnel with longitudinal smoke exhaust
ZHANG Liangliang1,2
1. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China; 2. National-Local Joint Engineering Research Center of Underwater Tunnelling Technology, Wuhan 430063, Hubei, China
Abstract: In order to verify the effectiveness of the overall operation control mode of the ventilation and smoke exhaust system in V-slope highway tunnel during fire, and to prevent the impact of fire smoke on the safety of personnel outside the tunnel entrance, a full-scale on-site physical fire test was carried out in Jinan Huanghe Tunnel to determine the flow characteristics of smoke and the diffusion of smoke from the tunnel entrance under different conditions. The results showed that when a fire occured in V-slope tunnel, the full jet longitudinal smoke exhaust system could operate effectively. When there was no mechanical ventilation, under the joint action of “chimney effect” and natural wind, the smoke spread distance was different under different fire power. The smoke temperature near the fire source was in the form of pulse, and the stratification was not obvious, while the vertical temperature in the far fire source was obvious. In mechanical ventilation, under different fire power, the average time of mechanical wind generated by the fan acting on the flue gas front was 15 s, which could completely control the upstream flue gas counterflow. After the flue gas exits the hole, the diffusion distance was proportional to the longitudinal wind speed. The safety distance of personnel outside the tunnel entrance was defined.
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ZHANG Liangliang. Field fire test on smoke flow characteristics of V-slope tunnel with longitudinal smoke exhaust. Hazard Control in Tunnelling and Underground Engineering, 2023, 5(2): 71-79.
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2023, Vol. 5 
