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dc.contributor.author | Schoeman, Nicholas Kyle![]() |
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dc.contributor.author | Jacobsz, Schalk Willem![]() |
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dc.contributor.author | Kearsley, Elsabe P.![]() |
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dc.date.accessioned | 2023-08-28T11:46:05Z | |
dc.date.available | 2023-08-28T11:46:05Z | |
dc.date.issued | 2022-11 | |
dc.description.abstract | A physical modelling approach was adopted to simulate the process of cave mining propagation at various horizontal to vertical stress state ratios, and image data was captured and used to characterize the resulting failure mechanisms. Image processing was integrated into the study to determine minor principal strains in models to identify where critical extensional strains had been exceeded relative to crack propagation. The study exhibited a scale factor magnitude of 119 using a calculated critical extensional strain value of 0.014% for the modelling material used. It was perceived that cave propagation occurred through successive parallel extensional ‘fracture bands’ in all cases, as noticed in models of prior studies, deviating from that described by the Duplancic model. Cracks tended to bisect regions of minor principal strain equal to the critical extensional strain, which suggests ‘fracture banding’ is an acceptable failure mode for brittle, rock-like materials. Moreover, it was found that models with lower horizontal to vertical stress ratios (K ratios) showed a greater degree of vertical development of the caving mechanism (at similar vertical stresses), while the vertical extent of the cave was suppressed in models with higher K ratios. Models subjected to larger vertical stresses experienced slower cave formation in latter time-steps. These models exhibited larger two-dimensional caved perimeters and areas, respectively. | en_US |
dc.description.department | Civil Engineering | en_US |
dc.description.librarian | am2023 | en_US |
dc.description.sponsorship | Newcrest Mining Limited. | en_US |
dc.description.uri | https://journals.co.za/journal/saimm | en_US |
dc.identifier.citation | Schoeman, N.K., Jacobsz, S.W., and Kearsley, E.P. 2022 The effect of overburden and confined stress state on cave mining propagation. Journal of the Southern African Institute of Mining and Metallurgy, vol. 122, no. 11, pp. 617–628. http://dx.DOI.org/10.17159/2411-9717/1910/2022. | en_US |
dc.identifier.issn | 2225-6253 (print) | |
dc.identifier.issn | 2411-9717 (online) | |
dc.identifier.other | 10.17159/2411-9717/1910/2022 | |
dc.identifier.uri | http://hdl.handle.net/2263/92084 | |
dc.language.iso | en | en_US |
dc.publisher | Southern African Institute of Mining and Metallurgy | en_US |
dc.rights | © Southern African Institute of Mining and Metallurgy. | en_US |
dc.subject | Physical modelling | en_US |
dc.subject | Cave mining propagation | en_US |
dc.subject | Particle image velocimetry | en_US |
dc.subject | Critical extensional strain | en_US |
dc.subject | Model material | en_US |
dc.title | The effect of overburden and confined stress state on cave mining propagation | en_US |
dc.type | Article | en_US |