【摘要】 为研究特殊线型的螺旋隧道中火灾蔓延规律,提出人员安全疏散规划,基于数值模拟软件FDS(fire dynamics simulator),以典型螺旋隧道——咪的村隧道为例,模拟20 MW火灾模式下,临界风速通风时螺旋隧道上行、下行隧道发生火灾后的火灾蔓延情况,重点分析螺旋隧道内温度和烟气浓度的纵向分布。根据模拟结果提出螺旋隧道火灾模式下人员安全疏散规划,进行咪的村隧道人行横通道设计校验。结果表明,螺旋隧道发生火灾时,人员的逃生方向与隧道上、下行及人员所处位置有关,应按照火灾蔓延烟气流动规律,有序的向更易撤离方向逃生;根据模拟结果,建议以900 s作为螺旋隧道人员可用安全疏散时间,经校验咪的村螺旋隧道人行横通道设计距离满足人员安全疏散要求。更多还原

【Abstract】 In order to study the fire spreading law in the special linear tunnel( spiral tunnel) and propose a safe evacuation strategy for personnel, the numerical simulation software fire dynamics simulator( FDS) was used to investigate how the fire spreading in the uphill and downhill spiral tunnels under the critical ventilation velocity and at the 20 MW fire mode,taking the typical spiral tunnel-Midi tunnel as an example. The longitudinal distribution of temperature and smoke concentration in the spiral tunnel was focused. According to simulation results,a safety evacuation strategy under the spiral tunnel fire mode was proposed,and the design verification of the distance between pedestrian cross-channel of Midi tunnel is carried out. The results shows that when there being a fire disaster in a spiral tunnel,the direction of the person to escape is related to the uphill or downhill type and the location of the personnel in the tunnel; It should be escaped in a more orderly direction according to the law of fire smoke spreading. It is recommended to take 900 s as the ASET( available safety escape time) in spiral tunnel and the designed distance between pedestrian cross-channel of the Midi spiral tunnel meets the requirements for personnel safety evacuation.更多还原