Fragment Size Distribution of Blasted Rock Mass

Rock mass is a heterogeneous material, and the heterogeneity of rock causes sizes distribution of fragmented rocks in blasting. Prediction of blasted rock mass fragmentation has a significant role in the overall economics of opencast mines. Blasting as primary fragmentation can significantly decreas...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2017-12, Vol.95 (4), p.42013
Main Authors: Jug, Jasmin, Strelec, Stjepan, Gazdek, Mario, Kavur, Boris
Format: Article
Language:English
Subjects:
Blast holes
Blasting
Blasting (explosive)
Compressive strength
Design parameters
Drilling
Explosions
Fragmentation
Heterogeneity
Image processing
Limestone
Mechanical properties
Modulus of elasticity
Quarries
Rock masses
Rocks
Size distribution
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Summary:Rock mass is a heterogeneous material, and the heterogeneity of rock causes sizes distribution of fragmented rocks in blasting. Prediction of blasted rock mass fragmentation has a significant role in the overall economics of opencast mines. Blasting as primary fragmentation can significantly decrease the cost of loading, transport, crushing and milling operations. Blast fragmentation chiefly depends on the specific blast design (geometry of blast holes drilling, the quantity and class of explosive, the blasting form, the timing and partition, etc.) and on the properties of the rock mass (including the uniaxial compressive strength, the rock mass elastic Young modulus, the rock discontinuity characteristics and the rock density). Prediction and processing of blasting results researchers can accomplish by a variety of existing software's and models, one of them is the Kuz-Ram model, which is possibly the most widely used approach to estimating fragmentation from blasting. This paper shows the estimation of fragmentation using the "SB" program, which was created by the authors. Mentioned program includes the Kuz-Ram model. Models of fragmentation are confirmed and calibrated by comparing the estimated fragmentation with actual post-blast fragmentation from image processing techniques. In this study, the Kuz-Ram fragmentation model has been used for an open-pit limestone quarry in Dalmatia, southern Croatia. The resulting calibrated value of the rock factor enables the quality prognosis of fragmentation in further blasting works, with changed drilling geometry and blast design parameters. It also facilitates simulation in the program to optimize blasting works and get the desired fragmentations of the blasted rock mass.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/95/4/042013