Experimental investigation on the effect of asymmetrical sealing on tunnel fire behavior

Abstract Sealing the tunnel entrance is a common tactic for tunnel fire fighting, while it is not easy to seal the two entrances synchronously in actual tunnel fire-fighting process. A set of reduced experiments were then conducted to investigate the effect of asymmetrical sealing of tunnel entrances on tunnel fire behavior and temperature distribution. The data of temperature, radiative heat flux and mass loss rate, etc. were acquired. The results demonstrate that hot smoke region shifts to the side not completely sealed, and burning at the side with less sealing ratio is more violent with higher smoke temperature and longer hot smoke plume. Plume temperature at the tunnel entrance could reach to 300 °C as measured in the experiments and jet flame was observed at the end not completely sealed. These would lead to great danger to fire fighters in actual tunnel fire fighting.

[1]  Chuangang Fan,et al.  Experimental study on transverse smoke temperature distribution in road tunnel fires , 2013 .

[2]  Yan Fu Wang,et al.  Maximum temperature of smoke beneath ceiling in tunnel fire with vertical shafts , 2015 .

[3]  Haukur Ingason,et al.  Performance-based design of road tunnel fire safety: Proposal of new Swedish framework , 2014 .

[4]  A. R. Nilsen,et al.  Results from three models compared to full-scale tunnel fires tests , 2009 .

[5]  Richard Carvel,et al.  A History of Fire Incidents in Tunnels , 2005 .

[6]  Wan Ki Chow,et al.  On the maximum smoke temperature under the ceiling in tunnel fires , 2006 .

[7]  Haukur Ingason,et al.  The maximum temperature of buoyancy-driven smoke flow beneath the ceiling in tunnel fires , 2011 .

[8]  Haukur Ingason,et al.  Design fire curves for tunnels , 2009 .

[9]  Haukur Ingason,et al.  Heat Release Rates of Multiple Objects at Varying Distances , 2012 .

[10]  Dougal Drysdale,et al.  Variation of heat release rate with forced longitudinal ventilation for vehicle fires in tunnels , 2001 .

[11]  Hiroomi Satoh,et al.  Fire properties in near field of square fire source with longitudinal ventilation in tunnels , 2003 .

[12]  Haukur Ingason,et al.  Heat release rates from heavy goods vehicle trailer fires in tunnels , 2005 .

[13]  Zhongyuan Yuan,et al.  Reduced-scale Experimental Research on Fires in Tunnels with Natural Ventilation☆ , 2013 .

[14]  Jie Ji,et al.  Influence of longitudinal fire location on smoke characteristics under the tunnel ceiling , 2015 .

[15]  Haukur Ingason,et al.  An engineering tool to calculate heat release rates of multiple objects in underground structures , 2011 .

[16]  Jie Ji,et al.  Experimental investigation on influence of different transverse fire locations on maximum smoke temperature under the tunnel ceiling , 2012 .

[17]  Zhongyuan Yuan,et al.  Ceiling temperature distribution and smoke diffusion in tunnel fires with natural ventilation , 2013 .

[18]  Haukur Ingason,et al.  Experimental study of non-monotonous sidewall effect on flame characteristics and burning rate of n-heptane pool fires , 2015 .

[19]  Jian Li,et al.  Theoretical Analysis on Sealing Suppression Effect in Heavy Haul Railway Tunnel Fire , 2012 .

[20]  Zhaozhou Li,et al.  A study of bifurcation flow of fire smoke in tunnel with longitudinal ventilation , 2013 .

[21]  Haukur Ingason,et al.  Fire Development in Large Tunnel Fires , 2005 .

[22]  Dezhi Zhu,et al.  Full-scale experiment research and theoretical study for fires in tunnels with roof openings , 2009 .

[23]  Jie Ji,et al.  Influence of longitudinal wind on natural ventilation with vertical shaft in a road tunnel fire , 2013 .

[24]  J. Ji,et al.  Experimental analysis of the influence of accumulated upper hot layer on the maximum ceiling gas temperature by a modified virtual source origin concept , 2015 .

[25]  Jie Ji,et al.  An experimental investigation on thermal characteristics of sidewall fires in corridor-like structures with varying width , 2015 .

[26]  Jie Ji,et al.  A numerical study on upstream maximum temperature in inclined urban road tunnel fires , 2015 .

[27]  Haukur Ingason,et al.  The maximum ceiling gas temperature in a large tunnel fire , 2012 .