Study On Fire Ventilation Control Scheme Of Subway Tunnel

As socialism with Chinese Characteristics has entered a new era,the economic development level of major cities is improving day by day,and the urban population is growing rapidly.The construction of subway can well alleviate the traffic pressure.Due to the particularity of subway,the safety of subway in operation must be paid attention to,especially the safety of subway section tunnel.The subway section tunnel is built underground,which is narrow,long and closed.In case of emergency,especially the section tunnel fire,it will become very difficult to evacuate.Therefore,it is particularly important to study how to reasonably carry out ventilation control,organize smoke flow and ensure personnel safe escape in case of subway tunnel fire.Taking the section from the Huanan Square station to Huanan North station of Dalian Metro Line 1 as the engineering background,research the reasonable ventilation control scheme and personnel evacuation route in case of interval tunnel fire.According to the position of the fire source relative to the train and the position of the train relative to the tunnel,four working conditions are set to simulate and analyze the existing longitudinal ventilation control mode of the subway.It is found that when the fire source is located at one end of the train,the actual longitudinal ventilation mode of the subway can ensure the safe escape of passengers.When the fire source is located in the middle of the train,the existing longitudinal ventilation control mode of the subway can not ensure the safe escape of passenger.This paper proposes a semi transverse ventilation scheme,that is,on the basis of the existing longitudinal ventilation control mode,add smoke exhaust pipes and smoke outlets.It is found that the semi transverse ventilation proposed in this paper can ensure the safe escape of passengers in case of fire in the middle of the train.Furthermore,the paper analyzes the requirements of maximum smoke outlet spacing and smoke exhaust volume under the semi transverse ventilation control mode,considering the unfavorable position of the train relative to the smoke outlet.For the escape time of personnel in the unfavorable position of the train relative to the smoke exhaust outlet under the semi transverse ventilation control mode,the empirical formula and Pathfinder simulation software are used to analyze respectively.The research results of the two methods show that the semi transverse ventilation control mode proposed in this paper can ensure the safe escape of passengers in case of fire in the middle of the train.The research results of this paper provide a reference for Dalian Metro to deal with the ventilation control scheme and personnel evacuation scheme of interval tunnel fire with small probability.