Numerical study of the impact of joints on rock fragmentation by blasting

Document identifier: oai:DiVA.org:ltu-76089
Keyword: Engineering and Technology, Environmental Engineering, Mineral and Mine Engineering, Teknik och teknologier, Naturresursteknik, Mineral- och gruvteknik, Blasting, Joints, Fragmentation, Mining and Rock Engineering, Gruv- och berganläggningsteknik
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructureSDG 3 Good health and wellbeing
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

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. 

Authors

C.P. Yi

Luleå tekniska universitet; Geoteknologi
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D. Johansson

Luleå tekniska universitet; Geoteknologi
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H. Schunnesson

Luleå tekniska universitet; Geoteknologi
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H. Åhlin

Luleå tekniska universitet; Geoteknologi
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