Study On Train Fire Characteristics And Personnel Evacuation In Extra-Long Tunnel Of Intercity Railway

With the rapid development of social economy,the development of cities has spread from the central city to the satellite city,and the intercity railway between metropolitan areas has become one of the main means of transportation between cities.The underground of intercity railway has also become a trend,and the number of extra-long intercity and urban railway tunnels has gradually increased.Especially with the development of Pearl River Delta,Yangtze River Delta and Beijing-Tianjin-Hebei core metropolitan area,the underground and public transportation of intercity railway has become increasingly obvious.Once a fire breaks out in the tunnel of extra-long intercity railway,the harm caused cannot be estimated.Compared with conventional subway projects,this kind of intercity railway tunnels located in economically developed and densely populated urban belts or connecting big cities and satellite cities have longer interval length,higher train fire load and faster train running speed.Compared with high-speed railway projects,they have higher departure density and more personnel.Therefore,based on this kind of tunnel,the research on train fire characteristics and personnel evacuation is carried out.In this study,the whole process of evacuation after train fire in inter-city railway tunnel is divided into two parts.Based on FDS numerical simulation software,the smoke spread,temperature change and CO concentration of six kinds of intercity trains,CJ1,CJ3,CJ4,CRH6 A,CRH6F and CRH2,are analyzed under different fire sources,and the available safe evacuation time ASET is obtained.Based on Pathfinder simulation evacuation software,This paper studies the internal evacuation of various types of intercity trains,and obtains the necessary safe evacuation time RSET of personnel evacuation when each type of intercity train is manned,and compares it with ASET of previous research,and obtains the maximum overcrowding ratio and the maximum number of people that can be carried by each type of intercity train.At the same time,after the intercity train stops at the rescue station,The process of evacuating people from trains to safe areas is studied,Firstly,the form of rescue station is determined,And based on Pathfinder simulation evacuation software,Determine the key parameters such as cross passage spacing,platform width and cross passage fire door width of rescue stations.After determining the parameters of rescue stations,the necessary evacuation time of rescue stations under the maximum number of intercity trains can be obtained,so that the reasonable spacing of rescue stations can be determined,and the situation of tracing trains affected by fire and personnel evacuation can be studied.The main research contents of this paper are as follows:(1)Study on fire characteristics of intercity train compartmentsThe full-scale numerical models of CJ1,CJ3,CJ4,CRH6 A,CRH6F and CRH2 intercity trains are established,The large eddy simulation method is used to study the fire characteristics of six types of vehicles under different fire sources,After different types of inter-city train fire,before the fire door of the fire compartment is closed,the smoke spread and visibility,temperature change and CO volume concentration change inside the train are obtained,and the available safe evacuation time ASET of different types of train fire is obtained.(2)Study on evacuation of fire in intercity train tunnelDrawing lessons from the existing research on train evacuation,Using Pathfinder simulation evacuation software,this paper studies the internal evacuation of CJ1,CJ3,CJ4,CRH6 A,CRH6F and CRH2 intercity trains and the evacuation of rescue stations,Determine that when the personnel is fixed,The necessary time for evacuation of personnel inside the train,By increasing the overcrowding ratio,the maximum overcrowding ratio of different models and the maximum number of people that can be carried by each model on the premise that the necessary time for evacuation is less than the available safe evacuation time ASET are obtained,Then,taking the maximum carrying capacity of CJ1 and CRH2 as examples,The key parameters such as the spacing of the cross passage,the width of the platform and the width of the fire door of the cross passage of the rescue station are determined.After determining the parameters of the rescue station,the necessary time for evacuation of the rescue station and the available time for the train to travel to the rescue station under the maximum number of intercity trains are obtained,and the reasonable spacing of the rescue station is determined.(3)Study on the Influence of Fire in Intercity Train Tunnel on Tracking TrainThrough the analysis of two-car tracking conditions,the relative position between the tail of the burning train and the rescue station is determined,and the evacuation under different working conditions when tracking the special parking space of the train is analyzed.At the same time,the characteristics of train fire in tunnel and the evacuation of tracked train personnel are studied.