Study On Fire Risk Assessment And Evacuation Of Underground Commercial Street

In recent years,with the rapid economic development and urban population continues to increase,there have been a large number of large-scale,complex underground commercial street.However,the frequent occurrence of fire accidents in underground commercial streets has attracted widespread attention.Underground commercial street fire characteristic has more combustible items,poor ventilation conditions,poor ventilation conditions,more power equipment,the difficult fire extinguished and evacuation.In case of fire,it will cause severe casualties and losses.Therefore,the timely control of the fire,to master the fire in the smoke of the law of the flow,so that personnel can safely evacuate,reduce casualties,has become an underground commercial street fire research important content.The numerical simulation software is used to simulate the flue gas spread process of underground commercial street fire,which can grasp the law of flue gas flow in underground commercial street,and it is instructive for the escape of firefighters in underground commercial street and the decision of firefighters.In this paper,the problem of fire accidents in underground commercial street is analyzed,and the research object and research contents of this paper are determined by analyzing the research results of many domestic and foreign research scholars on building fire and evacuation.The basic theory of fire numerical simulation and the theoretical basis of evacuation of fire personnel are studied,which lays the theoretical foundation for the simulation and evacuation.This paper analyzes the fire risk situation of an underground commercial street by using the multi-level extension theory,and establishes the evaluation index system including five primary indexes and 22 secondary indexes of construction,electrical,fire,emergency and safety management.The safety level of the underground commercial street is safer and there is still a greater possibility of fire.According to the most unfavorable principle to determine the underground commercial street 2 fire source location to the automatic sprinkler system and the exhaust system of the effective and ineffective set up eight fire scenes,using the FDS to simulate the 8 fire scenes of the underground commercial street,the time of the temperature,CO concentration and visibility of each outlet in different fire scenes was determined,that is,the safe evacuation time was available.Use Pathfinder to simulate evacuation of personnel and obtain the required safe evacuation time for each safe exit.Finally,the paper analyzes the two time,obtains the security of each exit,and puts forward countermeasures and measures for the fire prevention and control of the underground commercial street.Through the research of this paper,we can grasp the spread of fire smoke in the underground commercial street,provide some guidance for personnel escape and fire simulation training,and provide reasonable countermeasures for the fire protection measures of underground commercial street.