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Crack lengths or blast damage from string emulsion and electronic detonators
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Orica Mining Services.
2009 (English)In: Rock Fragmentation by Blasting: Proceedings of the 9th Int. Symp. on Rock Fragmentation by Blasting - Fragblast 9, Sept. 2009, Granada Spain / [ed] José A. Sanchidrián Blanco, Boca Raton, Fla: CRC Press, 2009, 469-480 p.Conference paper (Refereed)
Abstract [en]

The crack patterns from contour blasting in Ø48-mm holes with Orica/Dyno Nobel SSE 0.35, 0.5 or 0.9 kg/m string emulsion charges in the Bårarp gneiss quarry have been studied, using both Nonel and electronic detonators. Some 24 blocks from behind half-casts were sawn and the cracks mapped. The crack lengths caused by simultaneously initiated SSE 0.35 kg/m or packaged Ø17 mm Dynotex 1 were practically the same. SSE 0.5 kg/m gave a roughly 50% increase in length. Nonel initiation resulted in longer cracks, as did water-filled holes. Nonel also gave a rougher remaining rock surface and frequently undetonated charges were found on the muck-pile. Earlier damage zone data were used to develop a suggested addendum to the present Swedish damage zone table. The use of simultaneously initiated decoupled light contour charges (q < 0.6 kg DxM/m) in dry holes has a damage suppressing effect compared to normal pyrotechnic initiation

Place, publisher, year, edition, pages
Boca Raton, Fla: CRC Press, 2009. 469-480 p.
Keyword [en]
Civil engineering and architecture - Geoengineering and mining engineering
Keyword [sv]
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-37693Local ID: bca59310-ab73-11de-8293-000ea68e967bISBN: 978-0-415-48296-7OAI: oai:DiVA.org:ltu-37693DiVA: diva2:1011191
Conference
International Symposium on Rock Fragmentation by Blasting : 13/09/2009 - 17/09/2009
Note
Godkänd; 2009; 20090927 (finn)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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Ouchterlony, FinnOlsson, Mats
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