湖底双层超大直径盾构隧道火灾人员疏散分析*

为分析湖底双层隧道共用疏散楼梯间距设置对人员疏散安全性的影响,以两湖双层隧道为研究对象，运用数值模拟分析盾构段下层隧道发生火灾后，不同疏散楼梯间距对人员疏散时间、利用效率以及通过率的影响。研究结果表明:隧道采用侧部重点排烟，人员可用安全疏散时间TASET为1 200 s；疏散楼梯间距为100，120 m时，各疏散楼梯的利用效率、平均通过率相对稳定；从安全性、综合利用率和运行成本考虑，推荐疏散楼梯间距为120 m。研究结果可为湖底双层隧道工程疏散楼梯间距设计和人员安全管理提供理论依据。

Analysis on personnel evacuation in fire of a double-layer super-large diameter shield tunnel at bottom of lake

In order to analyze the influence of the setting of shared evacuation staircase spacing on the safety of personnel evacuation in the double-layer tunnel at the bottom of lake,taking the Lianghu double-layer tunnel as the research object,the influence of different evacuation staircase spacing on the personnel evacuation time,utilization efficiency and passing rate after the fire in the lower-layer tunnel at shield segment was analyzed by using numerical simulation.The results showed that when adopting the side key smoke exhaust in the tunnel,the available safe evacuation time TASET for personnel was 1 200 s.When the evacuation staircase spacing was 100 m and 120 m,the utilization efficiency and average passing rate of each evacuation staircase were relatively stable.Considering the safety,comprehensive utilization efficiency and operating costs,it was recommended to set the evacuation staircase spacing to 120 m.The research results can provide theoretical basis for the design of evacuation staircase spacing and personnel safety management of the double-layer tunnel project at the bottom of lake.