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通过对几条多车道高速公路隧道的安全评价研究,采用改进的经验公式法计算多车道隧道发生火灾时的人员疏散时间,并利用Pathfinder软件进行仿真模拟和比较分析。通过Pyro Sim软件模拟火灾场景,分析确定隧道火灾时的安全疏散时间。比较可用安全疏散时间(ASET)和需用安全疏散时间(RSET),判断隧道疏散的安全性。发现按照现有规范设计的隧道横洞不能够满足多车道隧道的安全疏散,重新拟定隧道横洞的间距及洞口尺寸;分析计算结果,建议采用增加隧道人行横洞尺寸的办法减少疏散时间,改善安全状况。
Through the safety evaluation of several multi-lane highway tunnels, the improved empirical formula method is used to calculate the evacuation time of multi-lane tunnel fire and the simulation is simulated and compared with Pathfinder software. Simulate the scene of fire by Pyro Sim software, and analyze and determine the safety evacuation time in tunnel fire. The available evacuation time (ASET) and required evacuation time (RSET) are compared to determine the evacuation safety of the tunnel. It is found that the tunnel cross-hole designed according to the existing norms can not meet the safety evacuation of multi-lane tunnels and the tunnel cross-hole spacing and hole size are re-formulated. Based on the calculation results, it is suggested to increase the tunnel cross-hole size to reduce the evacuation time and improve Security status.