Jhanwar, J.C. and Jethwa, J.L and Reddy, A.H (2000) Influence of Air-deck Blasting on Fragmentation in Jointed Rocks in an Openpit Manganese Mine. Engineering Geology, 57. pp. 13-29. ISSN 0013-7952

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Abstract

The influence of air-deck blasting on fragmentation in jointed rock masses of a manganese open-pit mine has been investigated. It is revealed that air-deck blasting improves the degree of fragmentation and produces more uniform fragmentation compared with conventional blasting. Mean fragment size (MFS) reduces from a range of 0.36–1.0 m to a range of 0.27–0.51 m. Fragmentation index (FI) and blast-induced fragmentation increase from 1.38 to 4.34 and from 37–65% to 66–100% respectively. Empirical correlations have been developed to estimate MFS and FI from conventional and air-deck blasting on the basis of Bieniawski’s rock mass rating, powder factor and ratio of spacing to burden. Results indicate that air-deck blasting could be more effective in very low to low strength moderately jointed rock masses than in medium strength highly jointed rock masses.

Item Type:	Article
Uncontrolled Keywords:	Air-deck; Blasting; Fragmentation; Jointed rock; Open pit
Subjects:	Blasting
Divisions:	UNSPECIFIED
Depositing User:	Dr. Satyendra Kumar Singh
Date Deposited:	25 Nov 2011 04:53
Last Modified:	25 Nov 2011 04:53
URI:	http://cimfr.csircentral.net/id/eprint/119

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