Study on personnel evacuation safety of highway tunnels under extra-long smoke exhaust stroke
In order to explore the personnel evacuation characteristics of extra-long tunnel under the mode of full jet ventila-tion and smoke exhaust,and demonstrate the safety of transverse evacuation mode under ultra-long smoke exhaust stroke,tak-ing Cili Tunnel as the base project,the smoke,CO volume fraction,visibility and other key fire parameters of tunnel fire under the extra-long smoke exhaust stroke were obtained,and the personnel safety evacuation laws of tunnel under different evacua-tion modes and spacing of evacuation exits were studied. The results show that when the spacing of pedestrian cross passage is fixed at 200 m and the width is 1.5 m,it takes about 507 s for the personnel in tunnel to escape from the awareness of fire oc-currence to the completion of evacuation,and there is no obvious change in the evacuation time with the increase of the width of pedestrian cross passage. The theoretical time from the fire occurrence to the completion of evacuation for the personnel in tunnel under different spacings and widths of pedestrian cross passage is not more than 841 s at the most,which is less than the available time of personnel evacuation. Therefore,the highway tunnel with ultra-long smoke exhaust stroke can ensure the safety of personnel evacuation by setting up the pedestrian and vehicle cross passages. The research results can provide theo-retical reference for the adoption of full jet ventilation and smoke exhaust scheme with little construction difficulty and low op-eration cost for extra-long highway tunnels over 5000 m.
万方数据
维普
