Modelling the size of the crushed zone around a blasthole

Esen, S., Onederra, I. and Bilgin, H.A. (2003) Modelling the size of the crushed zone around a blasthole. International Journal of Rock Mechanics And Mining Sciences, 40 4: 485-495. doi:10.1016/S1365-1609(03)00018-2


Author Esen, S.
Onederra, I.
Bilgin, H.A.
Title Modelling the size of the crushed zone around a blasthole
Journal name International Journal of Rock Mechanics And Mining Sciences   Check publisher's open access policy
ISSN 1365-1609
Publication date 2003-06
Sub-type Article (original research)
DOI 10.1016/S1365-1609(03)00018-2
Volume 40
Issue 4
Start page 485
End page 495
Total pages 11
Editor J.A. Hudson
Place of publication The Netherlands
Publisher Elsevier Science
Collection year 2003
Language eng
Subject C1
290701 Mining Engineering
640200 Primary Mining and Extraction Processes
Abstract A new model to predict the extent of crushing around a blasthole is presented. The model is based on the back-analysis of a comprehensive experimental program that included the direct measurement of the zone of crushing from 92 blasting tests on concrete blocks using two commercial explosives. The concrete blocks varied from low, medium to high strength and measured 1.5 in in length, 1.0 m in width and 1.1 m in height. A dimensionless parameter called the crushing zone index (CZI) is introduced. This index measures the crushing potential of a charged blasthole and is a function of the borehole pressure, the unconfined compressive strength of the rock material, dynamic Young's modulus and Poisson's ratio. It is shown that the radius of crushing is a function of the CZI and the blasthole radius. A good correlation between the new model and measured results was obtained. A number of previously proposed models could not approximate the conditions measured in the experimental work and there are noted discrepancies between the different approaches reviewed, particularly for smaller diameter holes and low strength rock conditions. The new model has been verified with full scale tests reported in the literature. Results from this validation and model evaluations show its applicability to production blasting. (C) 2003 Elsevier Science Ltd. All rights reserved.
Keyword Engineering, Geological
Mining & Mineral Processing
Detonation
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
2004 Higher Education Research Data Collection
 
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Created: Tue, 14 Aug 2007, 19:16:40 EST