Title: Effect of rock mass properties on blast-induced rock fragmentation

Authors: Bhanwar Singh Choudhary; Kumar Sonu; Keshav Kishore; Shahid Anwar

Addresses: Department of Mining Engineering, Indian School of Mines, Dhanbad – 826004, India ' Department of Mining Engineering, Indian School of Mines, Dhanbad – 826004, India ' Department of Mining Engineering, Indian School of Mines, Dhanbad – 826004, India ' Department of Mining Engineering, Indian School of Mines, Dhanbad – 826004, India

Abstract: Blasting converts the in-situ rock mass into a muck pile with appropriate shape, looseness and fragment size distribution suitable for subsequent downstream processes of loading, hauling, crushing, grinding. The fragment size distribution of blasted rock material is used in the mining industry as an index to estimate the effect of bench blasting. To investigate the influence of rock mass properties on fragmentation in bench blast, the degree and size distribution of fragments within a blasted rock mass is essential. This study presents the result of the effects of rock mass properties on rock fragmentation. Fragalyst® computer software was deployed to analyse the captured images for joint and fragmentation analysis. From the study it was found that the mean fragment size increases with increase in porosity, strength and in-situ block size but it decreases with increase in rock density for the given field constraints.

Keywords: blast-induced rock fragmentation; joints; explosives; rock mass properties; bench blasting; mining industry; size distribution; fragment size; porosity; strength; in-situ block size; rock density.

DOI: 10.1504/IJMME.2016.076489

International Journal of Mining and Mineral Engineering, 2016 Vol.7 No.2, pp.89 - 101

Received: 27 Aug 2014
Accepted: 24 Sep 2015

Published online: 10 May 2016 *

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