Prediction and Actual Oversized/Undersized Fragmentation in Underground Blasting
S. A. Vokhmin1, A. A. Kytmanov1, G. P. Erlykov2, E. V. Shevnina1, G. S. Kurchin1, A. K. Kirsanov1
1Siberian Federal University, Krasnoyarsk, Russia
2NorNickel’s Polar Division, Mayak Mine, Norilsk, Russia
Keywords: Rock fracture, grain-size composition, fragmentation, chamber, drilling-and-blasting, borehole, explosive charge, blast, oversize/undersize, statistical processing
Abstract
The blasting experience in Zapolyarny Mine is described, and the actual oversized/undersized fragmentation of blasting from haulage drift is presented. The drilling-and-blasting pattern parameters provide insufficient fragmentation quality, which elevates the blasting cost and reduces its efficiency. It is shown that the actual oversized/undersized fragmentation agrees with the Kuz-Ram fragmentation model. This allows adjusting the calculation parameters of uniformity index for the prediction and optimization of grain-size composition in broken muck. Possible causes of oversized/undersized fragmentation are discussed.
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