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Blasting against aggregate confinement: fragmentation and swelling in model scale
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2007 (English)In: Fourth EFEE World Conference on Explosives and Blasting: [Vienna Conference Proceedings 2007] / [ed] Peter Moser, European Federation of Explosives Engineers , 2007, 13-26 p.Conference paper, Published paper (Refereed)
Abstract [en]

Sub-level caving (SLC) is classified as a mass mining method and there is increasing interest in its application world wide and under a very wide range of geotechnical environments. In terms of flow, the caved rock or debris at the interface first acts as a wave trap, which may reduce the fragmentation. Model scale tests are being made to understand the mechanisms of rock breakage and therefore fragmentation under relatively confined conditions. To minimize geometrical and geological effects, tests were conducted mainly on cylinders of magnetic mortar of size Ø140×280 mm and PETN cord with different strengths was used as explosive in a center hole, giving a specific charge between 0,2 and 2,6 kg/m3. The size distributions of the blasted material and the aggregate as well as the swelling of the cylinders have been measured. For the latter, a freezing-slicing method was developed. The results show that the confinement results in fragmentation being coarser when compared to that from free cylinders, and that the properties of the debris have a strong influence on the fragmentation and the swelling.

Abstract [sv]

Skivrasbrytning är storskalig brytningsmetod som mer och mer har blivit intressant runtom i världen. I fronten av brytningen, så blir kontakten mellan rasmassor och skivraskrans en vågfälla. Detta kan i sin tur påverka fragmenteringen. Modellförsök har gjorts för att förstå mekanismerna bakom detta fenomen. Genom att minimera de geologiska effekterna hos modellmaterialet, så har försök gjorts på cylindrar av magnetitbruk med dimensionerna Ø140×280 mm. Pentylstubin har varit det primära sprängämne och därav har den specifika laddningen kunnat varieras mellan 0,2-2,6 kg/m3. Styckefall och svällning har mätts vid varje laddningskoncentration med varierade egenskaper hos de omgivande massorna. Genom att frysa proven efter sprängning, så har svällningen längs efter provkroppen blivit möjliga att bestämma. Resultaten visar att egenskaperna hos rasmassorna har stort inflytande på svällning och fragmentering.

Place, publisher, year, edition, pages
European Federation of Explosives Engineers , 2007. 13-26 p.
Keyword [en]
Civil engineering and architecture - Geoengineering and mining engineering
Keyword [sv]
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-39881Local ID: ecd36e90-6692-11dc-a0c3-000ea68e967bISBN: 978-0-9550290-1-1 (print)OAI: oai:DiVA.org:ltu-39881DiVA: diva2:1013400
Conference
EFEE World Conference on Explosives and Blasting : 09/09/2007 - 11/09/2007
Note
Godkänd; 2007; Bibliografisk uppgift: Modellförsök med sprängning mot rasmassor: inverkan på styckefall och svällning; 20070919 (dan930)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

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