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WebA more efficient blasting scheme is to bury the charges in a row of boreholes. In borehole cornice blasting, one may achieve satisfactory results with about half the explosive used … WebThe long and large-diameter uncharged hole-boring (LLB) method is a cut-blasting method used to reduce vibration induced by blasting. This method typically involves creating an uncharged hole with a 382 mm diameter and drilling 50 m in the tunnel excavation direction at a time. This method is reported to provide relatively good vibration reduction and with … WebCalculation of Damage FRAGMENTATION, VIBRATIONS, BLAST DESIGN 103 the correlation disappears completely after the first peak of the wave has passed. • The criterion says nothing about the coupling medium (material between the charge and the borehole wall). It is well known that in wet boreholes the damage is significantly increased. • The coupling … great start cranbourne