Pressurized air supply and smoke prevention mode for evacuation platform of interval tunnel under fire conditions

 According to GB 51298-2018 Standard for fire protection design of metro, when longitudinal smoke control is carried out in underground section, the direction of smoke flow should be controlled opposite to the passenger evacuation direction, and when facing the extreme situation of fire in the middle of the train, longitudinal ventilation cannot effectively ensure that all passengers are in a clean zone during evacuation. Through theoretical analysis, combined with the three-dimensional numerical simulation, ignoring the constraints of objective civil construction factors, based on the concept of ensuring the clean zone of the evacuation platform in the interval, presents a new model of air distribution for disaster prevention in the interval tunnel.Compares the smoke prevention effect with the traditional mode, and gives a new idea to deal with the fire in the middle of the train.