Estimation of Fines Generation in Blasting Using Dynamic Rock Properties and a Near-Field PPV Damage Model

Junnhyeok Park, Kwangmin Kim

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In the hard-rock mining industry, the generation of fines during blasting is an important issue because it has a significant effect on production processes. Although various approaches have been used to estimate fines generation in recent decades, as a practical matter, measuring the amount of fines is nearly impossible given the technical limitations and the scale of mine blasts. In this study, a dynamic PPV damage model was developed and applied to predict fines generation as a result of blasting. This modified version of the crushed zone model (CZM) considers dynamic rock properties and peak particle velocity (PPV), which represents the induced stress in blasting. Dynamic rock-fracturing tests were conducted using a split Hopkinson pressure bar (SHPB) to determine the parameters that represent the relationships between rock strength and strain rate as well as the relationships between fines amount and strain rate in the model. A case study was conducted that entailed determining the radius of the crushed zone for given blast designs and rock properties and then measuring the fines amount within this crushed zone. This case study indicated that the dynamic PPV model can provide a rough estimate of fines generation for given dynamic rock properties and blast design parameters and that this method has the potential to be a useful indicator, or index, of fines generation.

Original languageEnglish (US)
Pages (from-to)1169-1183
Number of pages15
JournalMining, Metallurgy and Exploration
Volume37
Issue number4
DOIs
StatePublished - Aug 1 2020

Keywords

  • Blast fines
  • Blast fragmentation
  • Crushed zone
  • DIF
  • Dynamic fragmentation
  • Near-field PPV
  • SHPB

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Chemistry(all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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