Abstract
In order to prove the practical effect of a water spray zone on suppression of the spread of underground fire, a full-scale experiment was performed in a 400 m long test gallery with a cross section of 5.4 m2.Firstly, it is clarified that a water spray method is effective when water droplets are uniformly sprayed in the gallery and the mean diameter is less than 0.4 mm. Secondly, the cooling effect of water spray is quantitatively discussed from many aspects such as heat transfer and ventilation. Finally, it is shown that the quantity of water required to suppress the spread of fire is proportional to the air velocity and the cross section of gallery and that for a strongest fire can be estimated by equation (5) in the paper.
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