Development of a New Model to Predict Uniformity Index of Fragment Size Distribution Based on the Blasthole Parameters and Blastability Index
A. Nourian, H. Moomivand
Urmia University, Iran
Keywords: Индекс однородности, размер фрагментов, уравнение Розина - Раммлера, параметры взрывной скважины, коэффициент взрываемости, Uniformity index, fragment size, Rosin and Rammler, blasthole parameters, blastability index
Abstract
Uniformity index n represents the range of fragment size distribution and it is applied to evaluate fragment size by Rosin and Rammler cumulative distribution function for a muck pile. The uniformity index n of fragment size distributionhas been assessed by digital image analysis technique for several blasthole parameters and different zones of in-situ rock mass conditions in five mines having a wide range of blastabilty index. The uniformity index n of the Rosin and Rammler equation has been determined by a new procedure using curve fitting program with the best correlation for all groups of results. The obtained real values of n had significant differences with estimated n by the former equations. Relations between n and several blasthole parameters, blastabilty index and mean fragment size (X50) of the results and their various combinations have been analyzed. Finally, a new empirical model having a good correlation has been developed to predict n value.
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