Fracture banding in caving mines

Dan Cumming-Potvin, Johan Wesseloo, S.W. Jacobsz, E. Kearsley

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

© 2016 The Southern African Institute of Mining and Metallurgy.The Duplancic model of caving is widely accepted in industry and is the framework within which most monitoring and numerical modelling results in caving mines are interpreted. As a result, the damage profile ahead of the cave back is often interpreted as continuously decreasing damage with increasing distance ahead of the cave back. Physical modelling of the caving process performed in a centrifuge did not support this expected behaviour, but instead suggested a discontinuous damage profile ahead of the cave caused by fracture banding. Some support is found in the literature to suggest that the behaviour observed in the models may also be present in the field. This notion is further supported by banding behaviour observed from microseismic monitoring at two block cave mines. Combining the information from the physical models, field observations referred to in the literature, and the microseismic analyses, it is concluded that the Duplancic model needs to be extended to include the phenomenon of fracture banding. It is also reasonable to expect that fracture banding may play a more important role in the caving process than has previously been recognized.
Original languageEnglish
Pages (from-to)753-761
JournalJournal of the Southern African Institute of Mining and Metallurgy
Volume116
Issue number8
DOIs
Publication statusPublished - 2016

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Caves
caving
cave
damage
Centrifuges
Metallurgy
monitoring
metallurgy
centrifuge
modeling
Monitoring
industry
Industry

Cite this

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title = "Fracture banding in caving mines",
abstract = "{\circledC} 2016 The Southern African Institute of Mining and Metallurgy.The Duplancic model of caving is widely accepted in industry and is the framework within which most monitoring and numerical modelling results in caving mines are interpreted. As a result, the damage profile ahead of the cave back is often interpreted as continuously decreasing damage with increasing distance ahead of the cave back. Physical modelling of the caving process performed in a centrifuge did not support this expected behaviour, but instead suggested a discontinuous damage profile ahead of the cave caused by fracture banding. Some support is found in the literature to suggest that the behaviour observed in the models may also be present in the field. This notion is further supported by banding behaviour observed from microseismic monitoring at two block cave mines. Combining the information from the physical models, field observations referred to in the literature, and the microseismic analyses, it is concluded that the Duplancic model needs to be extended to include the phenomenon of fracture banding. It is also reasonable to expect that fracture banding may play a more important role in the caving process than has previously been recognized.",
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Fracture banding in caving mines. / Cumming-Potvin, Dan; Wesseloo, Johan; Jacobsz, S.W.; Kearsley, E.

In: Journal of the Southern African Institute of Mining and Metallurgy, Vol. 116, No. 8, 2016, p. 753-761.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Fracture banding in caving mines

AU - Cumming-Potvin, Dan

AU - Wesseloo, Johan

AU - Jacobsz, S.W.

AU - Kearsley, E.

PY - 2016

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N2 - © 2016 The Southern African Institute of Mining and Metallurgy.The Duplancic model of caving is widely accepted in industry and is the framework within which most monitoring and numerical modelling results in caving mines are interpreted. As a result, the damage profile ahead of the cave back is often interpreted as continuously decreasing damage with increasing distance ahead of the cave back. Physical modelling of the caving process performed in a centrifuge did not support this expected behaviour, but instead suggested a discontinuous damage profile ahead of the cave caused by fracture banding. Some support is found in the literature to suggest that the behaviour observed in the models may also be present in the field. This notion is further supported by banding behaviour observed from microseismic monitoring at two block cave mines. Combining the information from the physical models, field observations referred to in the literature, and the microseismic analyses, it is concluded that the Duplancic model needs to be extended to include the phenomenon of fracture banding. It is also reasonable to expect that fracture banding may play a more important role in the caving process than has previously been recognized.

AB - © 2016 The Southern African Institute of Mining and Metallurgy.The Duplancic model of caving is widely accepted in industry and is the framework within which most monitoring and numerical modelling results in caving mines are interpreted. As a result, the damage profile ahead of the cave back is often interpreted as continuously decreasing damage with increasing distance ahead of the cave back. Physical modelling of the caving process performed in a centrifuge did not support this expected behaviour, but instead suggested a discontinuous damage profile ahead of the cave caused by fracture banding. Some support is found in the literature to suggest that the behaviour observed in the models may also be present in the field. This notion is further supported by banding behaviour observed from microseismic monitoring at two block cave mines. Combining the information from the physical models, field observations referred to in the literature, and the microseismic analyses, it is concluded that the Duplancic model needs to be extended to include the phenomenon of fracture banding. It is also reasonable to expect that fracture banding may play a more important role in the caving process than has previously been recognized.

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