Study On Smoke Flow And Evacuation In Subway Fire

With the rapid development of modern cities,the rail transit system is becoming more and more mature.Subway,as an important means of urban public transport modernization in the history of urban development,has emerged in this context with the rapid development of The Times.The extensive application of subway in the huge three-dimensional transportation network not only brings positive effects to urban environmental construction,but also gradually stabilizes the economic development pattern of win-win between economic and social development and ecological environmental protection.However,due to the limitations and relative closure of the subway space structure,the rapid temperature rise,high temperature and large smoke and other characteristics of the fire,it is extremely easy to cause serious casualties and property losses.In addition,the subway system is a public gathering place with a high population density,so it is difficult to carry out emergency evacuation and rescue activities.In recent years,the subway fire accidents occurred at home and abroad are countless casualties,which is no doubt for the people of the world to ring the alarm bell.Therefore,it is of great theoretical and practical significance to strengthen the study on the flue gas flow rule of subway fire,and the study on emergency evacuation of subway fire personnel is also indispensable.In this paper,a three-story island subway station is taken as the research object.FDS software is used to simulate and study the flue gas flow law when fire occurs at three different locations of subway station,including platform,station hall and section tunnel.In addition,Pathfinder software is used to design safe evacuation for personnel in various fire scenarios.In practical scenarios,it takes time from the location of fire to the spread of fire to the spread of smoke and evacuation of personnel.If the evacuation time of personnel is not more than the available evacuation time,the safety of personnel can be guaranteed and the loss of accidents can be reduced to this extent.This article is based on the above analysis,to the subway station using numerical simulation software simulation and fire evacuation simulation of the process of smoke spreading system of subway fire mode,temperature and CO concentration distribution and the distribution of visibility on quantitative analysis and qualitative analysis,summed up the fire scenario the spread regularity of smoke,and the fire after the subway station and tunnel adopts the quantitative calculation of time arrived in dangerous state,combined with the station and the tunnel characteristics,analysis of calculated based on the fire evacuation time.Finally,the evacuation time and available evacuation time are compared to judge whether the subway station meets the evacuation requirements in various fire scenarios,and then relevant Suggestions are put forward on the simulation results.Figure[50] table[14] reference[65]...