Field model experimental study on fire combustion and smoke temperature in #br# very-high-altitude tunnels
Wang Feng1,2 Huang Yubing1,2 Zhu Lei1,2 Wang Yu1,2
1. Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education, Southwest Jiaotong University, Chengdu 610031，China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031，China
Abstract：With the development of Sichuan-Tibet railway and highway at high altitudes, it is believed that “three low” environmental characteristics of very high altitudes may greatly affect the fire combustion and smoke spread in tunnels. A moveable model tunnel is transported to different altitudes, such as Chengdu Plain, mountains with altitudes of 3544 m and 4103 m, to study the fire combustion and smoke temperature distribution with the same pool size and volume. The results show that HRR (heat release rate) and smoke temperature on the top decrease significantly with the increase of altitude, but the combustion duration tends to be longer. The smoke temperature on the top at very high altitudes is slightly lower than that in plain with the same HRR. The longitudinal smoke temperature on the top decays more slowly at very high altitudes. The effect of buoyancy appears to be much more prominent in very high altitude tunnels.
王峰 黄玉冰 朱磊 王宇. 超高海拔隧道火灾燃烧与烟气温度现场模型试验研究[J]. 土木工程学报, 2020, 53(3): 114-120.
Wang Feng Huang Yubing Zhu Lei Wang Yu. Field model experimental study on fire combustion and smoke temperature in #br# very-high-altitude tunnels. 土木工程学报, 2020, 53(3): 114-120.
