自然风对多点进出地下道路通风性能的影响

随着城市建设发展,多点进出城市地下道路已经成为城市地下交通发展规划的新趋势。基于网络通风理论和通风设计标准,建立了一维隧道内压力平衡模型。以武汉市城市地下道路工程为背景,研究了自然风阻力作用对多点进出地下道路通风性能的影响。研究发现,多点进出地下道路按照设计规范推荐的自然风速进行通风设备配置,不完全能提高隧道整体设备配置的安全性。在隧道运营中应结合隧道自然风速和隧道平均车流速度变化,进行通风设备的运行控制。在典型自然风速下,匝道和主线的长度变化对出口匝道的通风量影响显著,对入口匝道通风量影响较小。研究成果可为同类工程的通风设计和隧道运营提供参考。

Analysis on the Influence of Natural Wind on the Ventilation Performance of Multi-entrances and Exits Underground Roads

With the development of urban construction, multi-entrances and exits urban underground roads have become a new trend of urban underground traffic development planning. Based on the network ventilation theory and the ventilation design standard, a one-dimensional pressure balance model in the tunnel is established. The influence of natural wind on the ventilation performance of multi-entrances and exits underground road combined with the urban underground road project in Wuhan city is studied. It is found that the safety of tunnel equipment configuration can't be completely improved if the ventilation equipment is configured according to the natural wind speed recommended by the design specification. In the operation of tunnel, it is necessary to control the operation of ventilation equipment in combination with the change of tunnel natural wind speed and average vehicle flow speed. Under the typical natural wind speed, the length change of ramp and main line has a significant impact on the off-ramp ventilation, but has a little effect on the on-ramp ventilation. The relevant conclusions provide reference for ventilation design and tunnel operation of similar projects.