带分支的城市交通隧道纵向排烟试验

Experiments on longitudinal smoke ventilation in the urban traffic link tunnel with branch

以国内某城市地下交通联系隧道为原型,搭建1∶3的缩尺隧道试验平台,设置分支隧道发生火灾,通过对烟气蔓延现象、隧道纵向烟气温度变化情况的分析,探究城市地下交通联系隧道采用纵向通风排烟模式的排烟效果。在全纵向通风排烟模式下,分支隧道发生火灾时,烟气进入主线隧道后未向上游蔓延,主线隧道可按交叉口处发生火灾采取应急措施。

Taking the urban traffic link tunnel in a pedestrian zone as a prototype,a tunnel test platform with a scale ratio of 1∶3 was set up. With the scenario of fire in branch tunnel,longitudinal exhaust ventilation mode was adopted to investigate the smoke ex-haust effect of vertical ventilation exhaust mode in urban traffic link tunnel through the analysis of smoke spread and longitudinal flue gas temperature change.Under the longitudinal ventilation and fire in branch tunnel,the smoke will not spread upstream after moving into the main tunnel,and the emergency response in main tunnel can refer to the scenario of fire at intersection.