Numerical Simulation of Smoke Back-layering Length with Different Smoke Exhaust Modes in Subway Tunnel

Abstract

In the increasingly congested urban ground transportation today, China's major cities are actively promoting the urban subway public transport system. But the fire safety problem is still a major issue of concern to people. In this paper, the FDS numerical simulation method is used to study the effect of several kinds of smoke control modes in the tunnel fire in the subway tunnel. The research results show that the current used smoke control mode in the subway tunnle is not the best option, as there is a great threat to the safety in the downstream space. The combination of longitudinal ventilation and specific smoke exhaust can control the smoke most effectively, which may be considered for the fire smoke design of the subway tunnel in the future.