A Discussion of Smoke Control for Urban Traffic Link Tunnel Fire

摘要

The fire risk in the Urban Traffic Link Tunnel (UTLT) is high and it will probably cause great lose, therefore, the research on smoke control of UTLT is important in theory and engineering practice, especially for the smoke control system design and personal evacuation design. A UTLT project in Chongqing, PR China was introduced. Several full-scale experimental tests have been carried out in the second-stage of the UTLT, and the experimental result under different transverse ventilation modes was discussed. The research shows that the length of the smoke control zone with 120 m is reasonable under the transverse ventilation. If a fire occurred in the uphill tunnel under transverse ventilation force mode, the optimal smoke control mode is that the mechanical ventilation systems in the fired zone and the adjacent zones in the downstream direction were activated as the smoke exhaust systems, and the mechanical ventilation systems in the two extended zones near to the two smoke exhaust zones were activated as the air supply systems. In addition, the smoke temperature distribution under the tunnel ceiling along the upstream longitudinal direction follows a power function, is similar to the previous prediction model by Alpert et al.