谈城市铁路隧道临界风速的合理确定

Discussion on rational determination of critical velocity of urban railway tunnel

采用试验研究的方法,针对隧道内有列车和无列车两种情况进行比较,通过分析临界风速与隧道内火源热释放率、隧道断面积等因素的关系,得出一般隧道中小型火灾时通风系统需采用的合理理论临界风速,为防排烟设计提供初步参考数据。

Applying experimental research method,the paper compares two kinds of tunnel conditions with and without trains. Through analyzing critical velocity and internal tunnel fire source heat releasing ratio and tunnel section area and other factors,it finally finds out that：rational theo-retical critical velocity should be adopted in internal tunnel ventilation system for small and medium fire,which has provided some basis for venti-lation and smoke-exhausting design.