Numerical Study on the Supply and Exhaust Port Size and Fire Management Method in the Semi-transverse Ventilation System for Road Tunnel

Abstract

In semi-transverse ventilation system applied for road tunnel, adjustment of the port opening ratio is an essential part for uniform airflow rate per unit length over the entire tunnel. However, it has not been considered decently throughout the design process and operating of the tunnel. Therefore, in this study, we developed a program for the calculation of the opening size ratio of supply or exhaust port in transverse ventilation system and carried out the research to present a management plan for the port. In supply duct system, the opening size of the port had a tendency to increase and then decrease later when it gradually becomes closer toward the bulkhead at the beginning of the duct the minimum opening degree is to appeared as 56%. In the exhaust system, port size is the smallest at the beginning of duct as 15%, has shown a tendency to increase towards the bulk head. As results of estimating the air flow rate for 300 m intervals, the exhaust flow rate in the center of tunnel appeared to be extremely low as 8.1% and 12.5% when port size is constant and is adjusted supply type. Thus, even if the normal ventilation efficiency is declines, yet it is highly recommend adjusting the port size in order to obtain a uniform flow rate at fire accidents.

Sustainable Urban Planning Technique of Fire Disaster Prevention for Subway

“…In addition, the tunnel fire has the characteristic of a narrow tunnel space, so there have been many problems in solving a safe evacuation environment by effectively controlling the generated fire effluent [44][45][46][47][48]. In this study, as the worst scenario, the evacuation was carried out using a subway station platform with active fire protection facilities by moving fire trains to nearby stations.…”