Study on coupling influence of slope,fatigue and visibility on evacuation speed of personnel in tunnel fire
In order to explore the coupling influence laws of the complex environment of tunnel fire on the evacuation speed of personnel,the evacuation tests were carried out on three factors of slope,human fatigue and visibility to obtain the influence law of single factor on evacuation speed,and the change formula of evacuation speed was fitted.Based on the speed variation formula of each single factor,a calculation method for the evacuation speed of personnel in tunnel fire under the multi-factor coupling influence was proposed.The results show that there is a linear negative correlation between the uphill evacuation speed and the slope.The regularity of downhill evacuation speed is weak.During long distance evacuation,the speed decrea-ses gradually due to fatigue,and the peak speed attenuation reaches 47％during 2 km evacuation.The proportion of speed at-tenuation caused by fatigue is positively correlated with the evacuation distance.When the visibility is high,the influence on evacuation speed is not significant.When the visibility is reduced to less than 10 m,it has a negative effect on evacuation speed.The research results can provide a reference for the design of tunnel evacuation facilities and the formulation of relative specifications,and provide a new idea for the traditional evacuation speed valuing method.
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