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dc.contributor.author | Couto, Paul Michael![]() |
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dc.contributor.author | Malan, D.F. (Daniel Francois)![]() |
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dc.date.accessioned | 2024-08-15T11:33:21Z | |
dc.date.available | 2024-08-15T11:33:21Z | |
dc.date.issued | 2023-05 | |
dc.description | This work formed part of the MSc study "The effect of geological alterations on pillar strength" of Paul Michael Couto at the University of Pretoria. (URI: https://repository.up.ac.za/handle/2263/86548) | en_US |
dc.description.abstract | We propose a layout design for the UG2 Reef where weak geological alteration layers are present. The collapse of the Everest platinum mine in South Africa indicated that these layers substantially weaken the pillars. The popular Hedley and Grant pillar strength formula cannot be used where these alteration layers are present. Underground investigations at Everest mine and numerical modelling of the layout were conducted using the TEXAN code and a limit equilibrium model. Simulations of a collapsed area and an intact area allowed for a preliminary calibration of the model. This was subsequently used to explore modified layouts for these ground conditions. An alternative is to compartmentalize the blocks of ore using barrier pillars. The numerical modelling predicted that the barrier pillars appear to remain stable even in the case of large-scale collapses, provided their width exceeds 25 m. Main access routes into the mine can be protected by a double row of pillars at least 15 m wide to provide a safe travelling way. As a cautionary note, these conclusions are based on the model calibration and this needs to be refined in future. Calibration of the limit equilibrium model remains a challenge owing to the large number of parameters involved. | en_US |
dc.description.department | Mining Engineering | en_US |
dc.description.librarian | am2024 | en_US |
dc.description.sdg | SDG-09: Industry, innovation and infrastructure | en_US |
dc.description.uri | http://www.saimm.co.za/journal-papers | en_US |
dc.identifier.citation | Couto, P.M. and Malan, D.F. 2023. Bord-and-pillar design for the UG2 Reef containing weak alteration layers. Journal of the Southern African Institute of Mining and Metallurgy, vol. 123, no. 5. pp. 245–252. http://dx.DOI.org/10.17159/2411-9717/2482/2023. | en_US |
dc.identifier.issn | 2225-6253 (print) | |
dc.identifier.issn | 2411-9717 (online) | |
dc.identifier.other | 10.17159/2411-9717/2482/2023 | |
dc.identifier.uri | http://hdl.handle.net/2263/97670 | |
dc.language.iso | en | en_US |
dc.publisher | Southern African Institute of Mining and Metallurgy | en_US |
dc.rights | © The Southern African Institute of Mining and Metallurgy, 2023. | en_US |
dc.subject | Limit equilibrium model | en_US |
dc.subject | TEXAN code | en_US |
dc.subject | UG2 reef | en_US |
dc.subject | Bord-and-pillar design | en_US |
dc.subject | Layout design | en_US |
dc.subject | SDG-09: Industry, innovation and infrastructure | en_US |
dc.title | Bord-and-pillar design for the UG2 reef containing weak alteration layers | en_US |
dc.type | Article | en_US |