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Yoon Ko, Ph.D., National Research Council Canada
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Ahmed Kashef, P.E., National Research Council Canada
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Mechanical Emergency Ventilation Systems (EVS) have been widely used in tunnels to mitigate fire hazards. However, a number of catastrophic tunnel fires have occurred and have raised questions about the effectiveness of the current tunnel fire safety systems. This paper discusses life safety issues that need to be considered in designing different types of the EVS commonly used in tunnels including transverse and longitudinal ventilation systems. It also discusses how airflow induced by the longitudinal and transverse ventilation systems could impact on the fire development and smoke dispersion in the tunnel. Tenability along the length of the tunnel produced by each type of the ventilation systems is also examined.
