Influence of Air-deck Blasting on Fragmentation in Jointed Rocks in an Openpit Manganese Mine
IR@CIMFR: CSIR-Central Institute of Mining and Fuel Research, Dhanbad
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| Title |
Influence of Air-deck Blasting on Fragmentation in Jointed Rocks in an Openpit Manganese Mine
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| Creator |
Jhanwar, J.C.
Jethwa, J.L Reddy, A.H |
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| Subject |
Blasting
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| Description |
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.
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| Publisher |
Elsevier
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| Date |
2000
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cimfr.csircentral.net/119/1/9.pdf
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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| Relation |
http://cimfr.csircentral.net/119/
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