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
a:2:{s:4:"TYPE";s:4:"HTML";s:4:"TEXT";s:131:"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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