Analysis of Urban Subway Fire Risk

J. Tan, T. Wang, and Y. Xie (PRC)


Urban subway, fire risk, risk resource, and evacuation


Fire was the main risk in subway system. Heat release rate and CO produce rate of electric cabinet, chair and vinyl panel that are main fire risk resources were measured by cone calorimeter. The experiment data were used in simulation process as parameters, and smoke spre- ad at island subway platform and station hall was simulated by FDS+EVAC. The relation of soot density, extinction coefficient and evacuation speed was gained through simulation results. The extinction coefficient increased with the soot density increasing, and the evacuation speed decreased with the extinction coefficient and soot density increasing, which had liner relationship. According to the STEPS simulation results, the main influence factors of evacuation were the width of exits and transference corridors, automatic fare gate, and the simulation results indicated that the existence of automatic fare gates reduced the efficiency of evacuation on emergency state. The evacuation time of no automatic fare gate was longer than evacuation time of automatic fare gate around 40%. Some countermeasures were provided for fire risk and evacuation smooth to decrease fire risk, which included increasing the width of each two automatic fare gate, adding exits on the side of automatic fare gate, and etc.

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