Asymmetric blasting: a rock mass dependent blast design method

Segui, J. L. B. (2002) Asymmetric blasting: a rock mass dependent blast design method. Fragblast, 6 3/4: 334-344.


Author Segui, J. L. B.
Title Asymmetric blasting: a rock mass dependent blast design method
Journal name Fragblast   Check publisher's open access policy
ISSN 1385-514X
Publication date 2002
Sub-type Article (original research)
DOI 10.1076/frag.6.3.333.14053
Volume 6
Issue 3/4
Start page 334
End page 344
Total pages 11
Editor H. R. Rossmanith
W. L. Fourney
Place of publication Netherlands
Publisher Swets and Zietlinger
Collection year 2003
Language eng
Subject CX
290701 Mining Engineering
640200 Primary Mining and Extraction Processes
Abstract Blasting has been the most frequently used method for rock breakage since black powder was first used to fragment rocks, more than two hundred years ago. This paper is an attempt to reassess standard design techniques used in blasting by providing an alternative approach to blast design. The new approach has been termed asymmetric blasting. Based on providing real time rock recognition through the capacity of measurement while drilling (MWD) techniques, asymmetric blasting is an approach to deal with rock properties as they occur in nature, i.e., randomly and asymmetrically spatially distributed. It is well accepted that performance of basic mining operations, such as excavation and crushing rely on a broken rock mass which has been pre conditioned by the blast. By pre-conditioned we mean well fragmented, sufficiently loose and with adequate muckpile profile. These muckpile characteristics affect loading and hauling [1]. The influence of blasting does not end there. Under the Mine to Mill paradigm, blasting has a significant leverage on downstream operations such as crushing and milling. There is a body of evidence that blasting affects mineral liberation [2]. Thus, the importance of blasting has increased from simply fragmenting and loosing the rock mass, to a broader role that encompasses many aspects of mining, which affects the cost of the end product. A new approach is proposed in this paper which facilitates this trend 'to treat non-homogeneous media (rock mass) in a non-homogeneous manner (an asymmetrical pattern) in order to achieve an optimal result (in terms of muckpile size distribution).' It is postulated there are no logical reasons (besides the current lack of means to infer rock mass properties in the blind zones of the bench and onsite precedents) for drilling a regular blast pattern over a rock mass that is inherently heterogeneous. Real and theoretical examples of such a method are presented.
Keyword Thermodynamics
Soil & Rock Mechanics
Mining Industry
Mining Engineering
Geotechnical Engineering
Explosives & Blasting
Engineering Thermodynamics
Combustion Engineering
Applied & Economic Geology
Q-Index Code CX

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
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Created: Tue, 14 Aug 2007, 19:25:44 EST