Abstract
Part 1 of the paper defined shear loaded orebodies and showed through case histories that both pillars and excavations are at elevated risks of failure when mining these orebodies. Part 2 of the paper presents new knowledge on the behaviour of pillars and excavations when mining such orebodies. Numerical modelling is used to understand the behaviours of these structures in the orebodies. It is established that pillars in shear suffer confinement loss compared to their equivalents under pure compression. The confinement loss increases with increasing shear loading in pillars with width : height (W : H)§1. For pillars with W : H §1, the Lunder and Pakalnis (1997) empirical pillar design chart should be used with caution. For excavations in eccentrically loaded orebodies, passive and active high stress envelopes are created in the excavation process. The combined effect of the active high stress and tension zones often results in excavation surface sloughing.
| Original language | English |
|---|---|
| Pages (from-to) | 240-249 |
| Number of pages | 10 |
| Journal | Transactions of the Institutions of Mining and Metallurgy, Section A: Mining Technology |
| Volume | 123 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Dec 1 2014 |
| Externally published | Yes |
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Keywords
- Active and passive stress envelopes
- Confinement loss
- Excavations
- New knowledge
- Numerical modelling
- Orebodies in shear
- Pillar design chart
- Pillars
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Geology
Cite this
Mining of orebodies under shear loading Part 2 -Failure modes and mechanisms. / Suorineni, F. T.; Mgumbwa, J. J.; Kaiser, P. K.; Thibodeau, D.
In: Transactions of the Institutions of Mining and Metallurgy, Section A: Mining Technology, Vol. 123, No. 4, 01.12.2014, p. 240-249.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mining of orebodies under shear loading Part 2 -Failure modes and mechanisms
AU - Suorineni, F. T.
AU - Mgumbwa, J. J.
AU - Kaiser, P. K.
AU - Thibodeau, D.
PY - 2014/12/1
Y1 - 2014/12/1
N2 - Part 1 of the paper defined shear loaded orebodies and showed through case histories that both pillars and excavations are at elevated risks of failure when mining these orebodies. Part 2 of the paper presents new knowledge on the behaviour of pillars and excavations when mining such orebodies. Numerical modelling is used to understand the behaviours of these structures in the orebodies. It is established that pillars in shear suffer confinement loss compared to their equivalents under pure compression. The confinement loss increases with increasing shear loading in pillars with width : height (W : H)§1. For pillars with W : H §1, the Lunder and Pakalnis (1997) empirical pillar design chart should be used with caution. For excavations in eccentrically loaded orebodies, passive and active high stress envelopes are created in the excavation process. The combined effect of the active high stress and tension zones often results in excavation surface sloughing.
AB - Part 1 of the paper defined shear loaded orebodies and showed through case histories that both pillars and excavations are at elevated risks of failure when mining these orebodies. Part 2 of the paper presents new knowledge on the behaviour of pillars and excavations when mining such orebodies. Numerical modelling is used to understand the behaviours of these structures in the orebodies. It is established that pillars in shear suffer confinement loss compared to their equivalents under pure compression. The confinement loss increases with increasing shear loading in pillars with width : height (W : H)§1. For pillars with W : H §1, the Lunder and Pakalnis (1997) empirical pillar design chart should be used with caution. For excavations in eccentrically loaded orebodies, passive and active high stress envelopes are created in the excavation process. The combined effect of the active high stress and tension zones often results in excavation surface sloughing.
KW - Active and passive stress envelopes
KW - Confinement loss
KW - Excavations
KW - New knowledge
KW - Numerical modelling
KW - Orebodies in shear
KW - Pillar design chart
KW - Pillars
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UR - http://www.scopus.com/inward/citedby.url?scp=84911925600&partnerID=8YFLogxK
U2 - 10.1179/1743286314Y.0000000072
DO - 10.1179/1743286314Y.0000000072
M3 - Article
VL - 123
SP - 240
EP - 249
JO - Transactions of the Institutions of Mining and Metallurgy, Section A: Mining Technology
JF - Transactions of the Institutions of Mining and Metallurgy, Section A: Mining Technology
SN - 1474-9009
IS - 4
ER -