Safety Reliability Method Applied to Evaluate Smoke Control System of Fire Accident in the Tunnel of Mass Rapid Transit System

article utilizes CFD software to investigate the smoke control system of the safety reliability for the underground Mass Rapid Transit (MRT) system. The purpose of this research is to simulate the fire occurring in the tunnel region where the smoke control system designs are corresponding to the National Federation of Paralegal Associations 130 (NFPA130). The smoke control mode of the tunnel includes the Tunnel Ventilation Fan (TVF) and Jet Air Fan (JAF) in the station. The control strategies of the TVF, JAF, and the flow phenomenon of the smoke in the fire environment are simulated by commercial software, PHOENICS. In the numerical simulation, the results show that under the conditions of turning on the TVF and JAF in 3 minutes later, if the fire in the tunnel region attains the criterion of temperature field (<60℃), the concentration of carbon monoxide (<1500ppm), radiation intensity (<6.3kW/m 2) and visibility (≥ 10m), passengers can evacuate from these safe passages. The smoke control system in this paper is very useful for fire accidents of the tunnels. The study verifies that simulation result is in good agreement with the standard of NFPA130.