武汉三阳路公铁合建越江隧道通风设计

Design of Ventilation of Yangtze River-crossing Highway-Metro Integrated Tunnel on Sanyang Road in Wuhan

武汉三阳路隧道为穿越长江的城市公路和轨道交通合建隧道,具有环保要求高、长度长和空间受限等特点,通风排烟系统设计难度大,且影响隧道的投资、运营费用、行车安全和防灾救援。为了解决洞口环保问题,对不同通风方案的气流组织、初期投资和运营费用进行研究,确定了竖井送排式纵向通风方案;针对公铁合建防灾要求高的特点,结合横断面布置,合建段公路隧道采用重点排烟,地铁隧道采用分段设置排烟道的纵向排烟方式,并采用模拟分析的方法对典型火灾工况进行了仿真计算,验证了排烟效果。

The Yangtze River-crossing highway-Metro integrated tunnel on Sanyang Road in Wuhan has many difficulties,i.e.high environmental protection,large length,limit space and hard ventilation system design.The ventilation system of the tunnel directly affects the construction investment,operation cost,traffic safety and fire rescue.For environmental protection of tunnel portal,the airflow,initial investment and operation cost of different ventilation schemes are studied;and the ventilation scheme of air-blow and air-exhaust through vertical shaft is adopted;for high fire rescue requirement,the attention should be paid to smoke exhausting of highway tunnel and the sectional longitudinal smoke exhausting method is adopted for Metro tunnel.Finally,a typical fire case is simulated and calculated.