Experimental study on influence of ground transverse slope on combustion and spread law of spill fire in tunnel
In order to investigate the influence of ground transverse slope on the combustion and spread law and the tempera-ture field distribution characteristics of spill fire in tunnel,a reduced-size tunnel model was constructed to carry out the study.The results show that when the leakage rate is small,the combustion diffusion of spill fire in tunnel with transverse slope can be divided into four stages,which are the combustion transverse diffusion stage,the retraction stage,the combustion stabiliza-tion stage,and the extinguishing stage.When the leakage rate is smaller,there is only a transverse diffusion stage of the spill fire,and when the leakage rate is larger,the longitudinal diffusion adhering to the wall will be formed after the transverse dif-fusion stage of fuel,thus forming the"T-shape fire"in the tunnel.Through theoretical analysis,the corresponding theoretical prediction models of transverse diffusion distance and longitudinal diffusion distance of spill fire are established.In addition,when the leakage rate is small,the high temperature region of the tunnel roof is in the center of the tunnel.When a"T-shaped fire"is formed,the temperature on the wall side of flame is significantly higher than the temperature at the centerline of tun-nel.The research results can provide theoretical support for the detection design of spill fire in tunnels.
spill fire in tunneltransverse slopeleakage ratecombustion ratetemperature field
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