竖井型城市隧道自然通风模型实验研究

Study on the Natural Ventilation Model Experiment in City Tunnel with Vertical Shaft

以连续竖井的静压分布特性为基础,采用分段模型实验方法,搭建了南京市某隧道模型,对正常交通状况下隧道交通风压进行实验,得到了隧道的自然通风特性及竖井通风的一般规律;建立了通风量与有害气体浓度之间关系的数学模型,研究了评价竖井对城市隧道自然通风效果影响的方法,并对该实际隧道通风效果做出评价,得出了竖井型城市隧道自然通风的相关结论,为此类城市隧道的设计及运营管理提供一定的参考。

Based on the distribution characteristic of static pressure of the continuous vertical shaft,a tunnel mode in Nanjing was set up with the experimental methods of segmentation model to make ventilation pressure experiment in city tunnel under the normal traffic,so the natural ventilation rule of the tunnel and some rule of the vertical shaft ventilation were gained.Through the establishment of the mathematical model between the ventilation quantity and the concentration of harmful gases,evaluating methods of the vertical shaft effect to natural ventilation in city tunnel were studied and the tunnel ventilation effect was evaluated,so some conclusions about tunnel＇s natural ventilation were got,which had some significance for the design of such cities and the operational management of the tunnel.