高海拔临界高度长大纵坡铁路隧道火灾安全距离数值模拟研究

Numerical Simulation of Fire Safety Distance of Railway Tunnel with Long Longitudinal Slope at Critical Height of High Altitude

随着川藏线的规划落实,大量高海拔铁路隧道开工建设,隧道内发生火灾后的安全疏散问题成为关键因素。为获得高海拔临界高度长大纵坡铁路隧道火灾场景下的安全距离,基于火灾动力学理论,通过FDS对铁路隧道火灾场景进行分析模拟并结合理论分析和资料调研等研究方法进行分析。结果表明:通过多种研究方法,选取温度、可视度、CO浓度等指标作为评价标准,最终综合分析得到高海拔临界高度铁路隧道火灾场景下的安全距离参数。研究成果可为高海拔铁路隧道的防灾运营及安全疏散提供参数支持。

With the implementation of the planning of Sichuan Tibet railway,a large number of high-altitude railway tunnels have been started,and the safe evacuation after a fire in the tunnel has become a key factor.In order to obtain the safety distance under the fire scenario of railway tunnel with high altitude critical height and long longitudinal slope,based on the theory of fire dynamics,the railway tunnel fire scenario is analyzed and simulated by FDS,combined with theoretical analysis and data investigation.The results show that through a variety of research methods,the indexes such as temperature,visibility and CO concentration are selected as the evaluation criteria,and finally the safety distance parameters under the fire scenario of railway tunnel at high altitude critical height are obtained through comprehensive analysis.The research results can provide parameter support for disaster prevention operation and safe evacuation of high-altitude railway tunnel.