【摘要】 利用FDS对某双层盾构公路隧道的侧向重点排烟系统进行了模拟研究，探讨了排烟口面积、间距、排烟口开启方案以及纵向通风对排烟效果的影响。结果表明：在无纵向风的条件下，火灾稳定后排烟口的面积为3～5 m~2、排烟口间距为60～100m时，排烟口的面积和间距对排烟效果的影响很小。随着纵向通风风速的增大和上游排烟口开启数量的增加，隧道侧向排烟系统的排烟效率明显减小。双层隧道上下层排烟口的排烟效率分布规律基本相同，下层隧道的总排烟效率略高一些。本文所研究的双层隧道发生20 MW火灾时，在纵向通风风速2 m/s下，排烟口间距为60 m，排烟口面积为4 m~2，上游开启2个排烟口、下游开启4个排烟口时排烟效果更好。更多还原

【Abstract】 The FDS was used to simulate the lateral point smoke exhaust system in a double-deck shield road tunnel,and the influence of smoke outlet area,space,smoke outlet opening scheme and longitudinal ventilation on the smoke exhaust system is studied.The results show that without longitudinal ventilation,the area within 3 m~2to 5 m~2and space between 60 m and100 m of smoke outlets have little effect on the effectiveness of smoke exhaust after the fire has stabilized.As the longitudinal ventilation velocity increases and more upstream smoke outlets opens,the smoke exhaust efficiency decreases significantly.The smoke exhaust efficiency for the upper and lower exhaust outlets of the double-deck tunnel is basically the same,and the total smoke exhaust efficiency of the lower tunnel is slightly higher than that of the upper tunnel.It is proposed that in the event of a 20 MW fire in this double-decker tunnel,smoke exhaust is most effective when the longitudinal ventilation velocity is 2 m/s,the smoke outlet space is 60 m,the smoke outlet area is 4 m~2,and two upstream and four downstream smoke outlets are opened.更多还原