What does the fragment size distribution of blasted rock look like?
2005 (English)In: Brighton Conference Proceedings: Third European Federation of Explosives Engineers (EFEE) World Conference on Explosives and Blasting / [ed] R. Holmberg, European Federation of Explosives Engineers , 2005, 189-199 p.Conference paper (Refereed)
Rock fragmented by blasting follows a different size distribution than the commonly used Rosin-Rammler distribution, especially in the fines range. Sieving data from many different blasting operations have led to a new distribution function, which can describe the fragmentation over the range 1-500 mm quite accurately. It is called the Swebrec© function and works also for crushed rock. It contains three parameters, the median fragment size x50, the maximum fragment size xmax and an undulation parameter b, which is shown practically to be a function of the other two. The fit to the sieved data is often , which is shown practically to be a function of the other two. The fit to the sieved data is often better than r2 = 0.995 over 2-3 orders of magnitude of fragment size. The Swebrec function could be used to estimate the complete size distribution from a sample in the fines range or the fines tail from coarse range data. It is used to construct a blast fragmentation model, the KCO model, which improves greatly on the Kuz-Ram model. In a first application it is shown how, in a given production situation, it is possible to predict the change in average fragmentation that is required to increase (or decrease), for example, the road base fraction 0-32 mm in the muckpile by a desired amount.
Place, publisher, year, edition, pages
European Federation of Explosives Engineers , 2005. 189-199 p.
Civil engineering and architecture - Geoengineering and mining engineering
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
Research subject Mining and Rock Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-37653Local ID: bbc13dd0-8abc-11db-8975-000ea68e967bISBN: 0-9550290-0-7OAI: oai:DiVA.org:ltu-37653DiVA: diva2:1011151
EFEE World Conference on Explosives and Blasting : 14/09/2005 - 16/09/2005
Godkänd; 2005; 20061208 (ysko)2016-10-032016-10-03Bibliographically approved