Mining Engineering > GATE 2026 > Rock Fragmentation - Blast Vibration (PPV)
In a bench blasting, as shown, 49 kg of explosive is put in each hole. The detonation time of holes, in millisecond, and the associated scale distance (SD) vs. peak particle velocity (PPV) plot for the given blast pattern is shown, with PPV = 250(SD)-1.5. Hole delay pattern: front row at 0, 25, 50, 75 ms; back row at 50, 75, 100 ms. The PPV at a distance of 100 m, in mm s-1, is ___________. (rounded off to two decimal places)
Correct : 7.79
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