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Computer simulations of blasting with precise initiation
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
DYNAmore Nordic AB, Linköping.
DYNAmore Nordic AB, Linköping.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Show others and affiliations
2012 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Using blasting caps with electronic delay units, it has become possible to employ wave superposition in rock blasting. This paper presents computer simulations to investigate the hypothesis that fragmentation is improved in areas between blast holes where the tensile waves meet, overlap and interact. In this study, a numerical methodology using the code LS-DYNA was developed. LS-DYNA is a commercially available multi-purpose finite-element code, which is well suited to various types of dynamic modeling. Two different element formulations were used — Euler formulation in, and close to, the blast hole, and Lagrange formulation in the rock volume farther from the blast hole. The models used have a resolution (element size) of 50 mm and comprise approximately 20 million elements. Single and dual blast hole configurations have been studied, and a methodology to calculate possible fragmentation based on model interpretation was developed. The results showed that the amount of explosives and the blast hole spacing had the largest effect on fragmentation. The effect of varying delay times was small and local, implying that a significant increase in fragmentation should not be expected through wave superposition.

Place, publisher, year, edition, pages
2012.
National Category
Other Civil Engineering
Research subject
Mining and Rock Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-30974Local ID: 50062b22-cae4-4e30-8144-cb58eeb9f3a0OAI: oai:DiVA.org:ltu-30974DiVA: diva2:1004203
Conference
Eurock 2012 : Rock Engineering and Technology for Sustainable Underground Construction 25/05/2012 - 27/05/2012
Note
Godkänd; 2012; 20120608 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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fulltext(811 kB)64 downloads
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CiteExportLink to record
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