长大隧道火灾纵向疏散救援通道正压送风策略研究

Study on Positive Pressure Air Supply Strategy for Longitudinal Evacuation and Rescue Routes of Long & Large Tunnels in Fire Cases

为确定长大隧道火灾纵向疏散救援通道正压送风策略,对虹梅南路—金海路通道区段进行数值模拟研究。根据送风方式、开启逃生楼梯间个数、救援楼梯间个数、防火门个数分6个工况进行研究。数值模拟结果表明,为降低长大道路隧道纵向疏散救援新技术体系的工程建设风险,需配合合理的正压送风策略。对疏散通道采取正压送风,并采用逆向单侧送风以利于提高疏散楼梯间的风速。

In order to formulate positive pressure air supply strategy for longitudinal escape and rescue routes of long & large tunnels in fi re cases, numerical simulation is employed to conduct research on the tunnel section of South Hongmei Rd.-Jinhai Rd. According to the mode of ventilation and the numbers of activated staircases for escaping and rescuing and the fireproof doors, six operating conditions are researched. The results of the numerical simulation indicate that it is quite essential to formulate proper positive pressure air supply strategy to reduce the engineering construction risk of the new technology system of long and large road tunnel longitudinal evacuation and rescue. For the evacuation route, positive pressure air supply is applied. On the other hand, reverse unilateral air supply can improve the air velocity in staircases for evacuation.