Abstract
A long distance road tunnel in urban area encounters heavy traffic composed of concentrate urban traffic networks and often has characteristics of a steep tunnel section caused by constraints of land acquisition. In tunnel planning for the Metropolitan Expressway emergency exits are installed with the optimum spacing on the operation of the wind velocity suppression control, in general about 250m but 50m in the shortest, to provide evacuation routes from a tunnel fire in heavy traffic congestion. A fire in a steep tunnel ramp brings a high risk of the deterioration of the evacuation environment in a short time with the cause of smoke advection flowing to the steeper and higher side by thermal buoyancy. Therefore, preserving the evacuation environment is considered to be difficult only by controlling the wind velocity suppression even if the emergency exits are located in the shortest spacing, the additional operation of the relevant smoke exhaustion control is essential in the steep tunnel ramps. This study introduces the smoke exhaustion control method in order to secure the safety at a fire in the tunnel ramps for the Yokohama Circular Northern Route of the Metropolitan Expressway.
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