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Tunnels are considered as one of the main methods to solve physical traffic barriers. However, It vulnerable to the threat of fire during the process of tunnel operation period. In response to such situation, this article explores the smoke distribution of extra-long double-tube tunnel and its impact on evacuation in the event of a fire. This paper take the Jieling tunnel as an example, and applies Accident Tree Analysis (ATA) method combined with Fires Dynamics Simulator (FDS)simulation software to study the changes of harmful factors such as tunnel smoke. Finally, the function of air curtain in the control of smoke is analyzed. The calculation results show that: the structure of the double-hole extra-long tunnel and air curtain could help people have enough time to escape.

Study on Fire Smoke Distribution and Smoke Control in Extra-long Double-hole Tunnel