郑州地铁17号线长大区间隧道中间风井通风方案研究

Study of Ventilation Schemes for Intermediate Ventilation Shaft in Long Tunnel Section on Zhengzhou Subway Line No. 17

郑州地铁17号线长大区间隧道(机场站—新港八路站)设置2座中间风井,长度约为6.7 km。为研究该长大区间中间风井最佳通风方案,采用SES软件建立全线数值计算模型,分析对比不同中间风井活塞通风模式下,该区间隧道的新风量、温度、初投资和牵引能耗费用等,得到中间风井最佳通风方案。结果表明:1)双活塞通风模式下该区间隧道新风换气次数最大且大于3次/h,远期高峰小时隧道内平均温度最低;2)双活塞通风模式初投资最高,牵引能耗费用最低,相较于其他通风方案,建成通车后26年节省的总牵引能耗费用可抵消额外投资;3)从隧道环境和工程经济性综合分析,推荐采用双活塞通风模式。研究结果可为地铁隧道通风系统设计提供参考。

There are 2 intermediate ventilation shafts with length of 6. 7 km in long tunnel section on Zhengzhou Subway Line No. 17,Air Port Station-Xingang Eight Road Station Section. In order to study the optimum ventilation scheme for the tunnel section,the numerical calculation model of the whole route is established by software subway environment simulation（SES）. And then the fresh air volume,temperature,preliminary investment and traction energy cost of the tunnel section under different piston ventilation modes of intermediate ventilation shaft are analyzed to obtain optimal ventilation scheme. The results show that：（1） Under the double piston ventilation mode,the average air temperature in long-term peak hours of tunnel is the lowest; and the fresh air changing time in tunnel is the most and greater than 3 per hour.（2） The preliminary investment of the double piston ventilation mode is the highest; but the traction energy cost is the lowest; compared to the other ventilation schemes,the total traction energy cost saved after 26 years＇ operation can offset the additional investment.（3） The double piston ventilation mode is recommended considering tunnel environment and engineering economy. The results can provide reference for the design of subway tunnel ventilation system of the similar projects in the future.