Application of Jet Ventilation Technology in Entrance Portion of No.1 Dayaoshan Tunnel

Jet ventilation is one of the major ventilation modes for highway tunnels,while it is a somewhat new ventilation technology for railway tunnels.Since the first successful application of jet ventilation technology in Yaji tunnel(2528m long) on Jiao-Liu railway in 1988,jet ventilation technology has been gradually used in railway tunnels and rapid progress has been made.On basis of comparison of the advantages/disadvantages of gallery ventilation and jet ventilation,it is determined that gallery ventilation incorporating jet ventilation technology is adopted for the entrance portion of No.1 Dayaoshan tunnel.In the paper,detailed ventilation schemes are described and countermeasures to guarantee the ventilation effect are presented.