Straddle monorail tunnel are mainly used in urban rail transit with the characteristics of larger structural section, larger
slope, and higher heat release rate than subway tunnel. In order to study the influence of slope and heat release rate on
smoke movement of critical velocity of longitudinal ventilation tunnel, different slope (-6%, -3%, 0%, 3%, 6%) and
different heat release rate (5 MW, 10 MW, 20MW, 50MW) are studied in this paper based on the 1/20 straddle monorail
tunnel model. The result shows that the slope of the tunnel and the heat release rate of fire are the main influencing factors.
Firstly, compared with 0% critical velocity, the critical velocity of uphill air supply is greater and that of downhill air
supply is smaller. Secondly the critical velocity of downhill air supply changes very little when the heat release rate and
slope are large enough. Besides, critical velocity of the uphill air supply has a linear relationship with the slope, while that
of the downhill air supply has an inverse proportional relationship with the slope. Finally, the critical velocity factor based
on experimental data is proposed at the end of the paper.
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