Numerical study on transverse temperature distribution of fire zone in metro tunnel fire

To study transverse temperature distribution of fire zone in subway fire, an entity tunnel model is established by fire dynamics simulation software FDS to simulate transverse temperature distribution away from fire source 0 m, 0.5 m in different fire powers. The results showed that: fire power is closely related to the temperature of the surface of the lining, the greater the power, lining temperature higher at the same location. At the same time the highest temperature of lining in the fire zone is in the top, followed by bottom, the lowest central. So we should thicken the thickness of the protective layer of reinforced in the top during tunnel construction and anti-fire design, at the same time, cabling should be possible to set up in the central to prevent heat damage. A fitting formula determining the transverse temperature distribution of radiation zone and convection zone was developed by the dimensionless temperature treatment. It has high accuracy and mostly within 10% error, can be well applied into engineering. (C) 2016 Published by Elsevier Ltd.