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为研究多排烟井隧道内火灾场景下的烟控关键技术参数,以长沙市某城市公路隧道为背景,首先通过对该隧道内的火灾致灾原因及灾害特点等因素进行分析,确定该隧道内的车辆事故下的火灾热释放速率;其次利用基于火灾动力学理论的计算模型分析该隧道内车辆火灾事故,研究火灾事故下隧道内的烟雾分布规律及特性;最终基于各类通风方案下烟雾控制情况制定合理的烟雾控制方案。结果表明,城市隧道内30 MW的火灾场景下仅利用1个排烟井无法将烟气完全抑制在火灾至火灾下游1个排烟井范围内;利用火灾下游两个排烟井排烟时,烟雾能够得到较好地控制,第二个排烟井下游不受烟气的影响。
In order to study the key technical parameters of smoke control in multi-row smoke tunnel under fire scene, taking a city highway tunnel in Changsha as a background, firstly, the causes of fire disaster and the characteristics of disasters in the tunnel were analyzed to determine the tunnel The fire release rate under vehicle accident was analyzed. Secondly, the calculation model of fire dynamics was used to analyze the vehicle fire accident in tunnel and the distribution and characteristics of smoke in tunnel under fire accident. Finally, Control the situation to develop a reasonable smoke control program. The results show that the use of only one exhaust well in the 30 MW urban fire scene can not completely suppress the flue gas within the range of 1 exhaust well downstream from the fire to the fire. When using two exhaust vents in the lower reaches of the fire, The smog can be well controlled and the second downstream exhaust well is unaffected by flue gas.