Prediction of Fragmentation Quality of Blasted Rock Using Energy Indicators of Drilling at Koktaszhal Deposit
S. G. Tyan1,2, A. B. Makarov3, V. N. Dolgonosov1, E. Yu. Ol’khovskaya1, M. Zh. Balpanova4
1Abylkas Saginov Karaganda Technical University, Karaganda, Kazakhstan
2Geo Engineering LLP, Karaganda, Kazakhstan
3CMT Consulting, Moscow, Russia
4Scientific and Technical Center for Industrial Safety, Karaganda, Kazakhstan
Keywords: Mechanical specific energy, drilling, blasting, rock mass, rock fragmentation, rock strength
Abstract
Coarse oversize fragments generated by blasting complicate loading and haulage of rocks, and this leads to the decreased productivity of labor and to the increased cost of mining. This article analyzes specific energy of roller-bit drilling as a drillability criterion as a case of the Koktaszhal deposit in Kazakhstan. Two electric drill rigs DML-1200 were additionally equipped with energy consumption recording facilities. The correlations between the powder factor, explosive fracture energy and ultimate compression strength of rocks, and between the average fragment and specific drilling energy are determined. For the blast design practice in open pit mining, it is substantiated to pass from mechanical specific energy of drilling to specific energy of explosive fracture and, further, to prediction of an average fragment of blasted rock. The experimental blasting operations at the Koktaszhal open pit mine show positive results which open prospects for the further research.
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