| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程所 === 94 === Abstract
During the period of past 25 years (1980~2004), 160 fire accidents were occurred
in tunnel. The statistics analysis based on these cases showed that the injuring
properbility is over 50%, and the injuring properbility due to fire are almost the same
between road tunnel fire and railway tunnel fire. Although, fire caused more people
injured in railway tunnel than in road tunnel, but the properbility of fire caused death in
the road tunnel is higher than the properbility in railway tunnel.
In this study, the numerical simulations by FDS were performed to investigate the
relationship between smoke velocity and heat release rate, and furthermore the confined
velocity under various fire scenarios were studied.
The simulation results showed that the smoke velocity is less than passenger
walking speed when the heat release rate of fire are less than 30 MW under
non-ventilation situation. That means the passenger could evacuate safety to emergency
cross connections during a 30MW fire occurred in tunnel. On the other hand, the
numerical investigation of confined velocity based on O. Vauquelin’s experiment
conditions showed that the numerical confined velocity of 0.2MW fire are agree well
with O. Vauquelin’s results in L/H- U/U0 diagram, but the numerical confined velocity
of 10MW fire are overestimated than O. Vauquelin’s results. The possible reason might
be the usage of fire source.
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