Research On Evacuation Of Subway Fire Personnel Based On Pyrosim+Pathfinder

In recent years,Due to its large capacity,punctuality and speed,the subway has effectively solved the daily travel problems of residents.However,the underground subway has the characteristics of complex structure,poor fire resistance,concentrated personnel,and difficulty in evacuation.In the event of a fire or other unexpected accident,it may cause casualties and property losses.Therefore,it is of great theoretical and practical significance to strengthen the research on subway fire and evacuation.In order to prevent the occurrence of subway fires or reduce the losses caused by fires,this paper based on the theory of fire dynamics,the characteristics of subway fire and the theory of evacuation,this paper puts forward the research idea of subway fire evacuation based on Pyrosim+Pathfinder.Through field investigation,qualitative and quantitative analysis,simulation and other methods,the Qingdao Wusi Square subway station was taken as the research background,and the evacuation problem of subway fire personnel was deeply studied.Based on the field investigation of the May Fourth Square subway station,Knowing the profile of the subway station and the movement of people,it is determined that 779 people should be evacuated at the peak of the flow,mainly for children,adult males,adult women and the elderly,the proportion accounted for12.5%,34.3%,37.5%,15.7%.Using Pyrosim to carry out fire simulation modeling on the Wusi Square subway station,mainly to study the working conditions of two different fire source locations: the end fire of the platform and the fire in the middle of the platform,the main influencing factors such as temperature,CO concentration and visibility were analyzed with time and their effects on evacuation,and the various evacuation locations(stairs 1-6,exit A-E)and their available safe evacuation time were determined.The results show that under working condition one,the stairs 4 near the fire source are not suitable for evacuation,and other stairs and exits can be evacuated,Among them,the staircase 2 is the safest,the safe evacuation time is 320 s.Under working condition two,the stairs 6 are not suitable for evacuation,and other stairs and exits can be evacuated,Among them,the stairs 4 are the safest,the safeevacuation time is 185 s.Using Pathfinder to simulate the evacuation of fires under the two working conditions of Wusi Square subway station,analyze the evacuation process and the utilization rate of each outlet,and obtain the necessary safe evacuation time of key evacuation positions under two working conditions.The results show that in the working condition one,except for the stairs 4,the necessary safe evacuation time for other stairs and exits is less than the available safe evacuation time,which can ensure the safe evacuation of personnel.Under working condition two,except for stairs 6 and stairs 2,the necessary safe evacuation time for other stairs and exits is less than the available safe evacuation time,which can ensure the safe evacuation of personnel.Aiming at the problems of personnel evacuation,reasonable and effective safety measures and emergency evacuation suggestions for preventing fires or reducing fire losses were put forward.The above research results can provide a certain reference for subway fire prevention and personnel evacuation,and provide a basis for scientific disaster reduction and disaster prevention.