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Numerical study of the impact of joints on rock fragmentation by blasting
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-5872-5173
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-5165-4229
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2019 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Rock masses consist essentially of intact rock and discontinuities such as joints. Blasting is mostly used method for the rock excavation. To investigate the effects of joints on the fragmentation by blasting, three models with different joint patterns and one model without joint were created in the LS-DYNA code. In these models, a bonded particle model was used to represent the rock to be blasted, a finite element model was adopted to model the remaining rock mass and a particle blast model was employed to describe the detonation of explosives. To validate the contact model for joints, the fragmentation pattern and the individual particle motion from two single borehole shot models with and without joints were compared. The numerical results indicated that the existence of joints has a significant effect on fragmentation and vibration. The models with joints produced finer fragmentation compared to the model without joints in the paper. 

Place, publisher, year, edition, pages
2019.
Keywords [en]
blasting, joints, fragmentation
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-76089ISBN: 978-0-9550290-6-6 (print)OAI: oai:DiVA.org:ltu-76089DiVA, id: diva2:1353391
Conference
EFEE 10th World Conference on Explosives and Blasting
Available from: 2019-09-23 Created: 2019-09-23 Last updated: 2019-12-17

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Yi, ChangpingJohansson, DanielSchunnesson, HåkanÅhlin, Hans

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