Abstract
In the previous study the author pointed that there were many problems about practical blasting theory in Japan.Experiments were performed to establish the relationship between blasting factor and blasting effect (funnel ratio N).The material used for blasting (crater test) is a cubic mortar block, (60cm × 60cm × 60cm), the four vertical faces of which were utilized. The total number of the experiment is 110.The results are summerized as follows:The funnel ratio ranges between 2.5 to 4.5 in proportion to the rock strength and the burden. It was also noted that the funnel ratio is independent of the explosive amount.
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