Abstract:  In order to study the feasibility and effectiveness of full jet longitudinal smoke exhaust in highway tunnel with the super-long length of more than 5 km, full jet longitudinal smoke exhaust field fire test of 20 MW is carried out in the left tunnel of Yanglushan tunnel with a total length of 6 015 m, which is a downhill tunnel that is not conducive to smoke exhaustion.Natural wind velocity in the left tunnel of the Yanglushan tunnel is 1.0~1.6 m/s during the field fire test, and the wind direction is opposite to the direction of smoke exhaust, which is resistance for smoke exhaust. The research shows: The wind velocity is 3.5 m/s along the downhill tunnel when 6 groups of jet fans are started up, which is 5.5~7.0 m/s with 12~15 groups;From the start of ignition, the smoke exhaust time of the 20 MW oil pan fire is about 30 min.According to the test results,with the safety of personnel,it is feasible to use the full jet longitudinal exhaust in the Yanglushan tunnel.

Key words:  super-long highway tunnel, tunnel fire, smoke exhausting, jet ventilation