Abstract
In this paper, we present experimental results on the behavior of underground fires loaded with low fuel density and discuss the prevention of flame propagation along timbered roadways. A series of fullscale fire experiment has been carried out, using a 400 meter long test gallery and timber linings as a fuel installed in the gallery. The performances of fire resistant zones were tested under the condition that the quantity of combustible materials was reduced up to critical values, necessary to suppress flame propagation along timber lining. As a result, it was found that the quantity of fuel largely influenced the properties of underground fires, i. e., flame spread rate, fire zone length and fire temperature. A critical combustion condition was appeared in which any flames did not propagate on the leeward of ignition source, if the quantity of fuel became relatively low such as less than 7.5 or 10kg per unit gallery volume (m3). The effect of ventilation air velocity on the critical fuel quantity was also clarified in the experiment. Thus, we could provide fundamentals to make clear requirements for fire resistant zones in underground roadways.
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