Determination of stable spans in UG2 excavations.

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dc.contributor.author Watson, B.P.
dc.contributor.author Gerber, R.
dc.date.accessioned 2018-08-24T06:22:42Z
dc.date.available 2018-08-24T06:22:42Z
dc.date.issued 2018-05
dc.identifier.citation Watson, B.P. and Gerber, R. 2018. Determination of stable spans in UG2 excavations. Journal of the Southern African Institute of Mining and Metallurgy 118(5), pp. 493-504. en_ZA
dc.identifier.issn 2225-6253
dc.identifier.other 10.17159/2411-9717/2018/v118n5a6
dc.identifier.uri https://hdl.handle.net/10539/25473
dc.description.abstract The hangingwall of the UG2 Reef is characterized by stratification in the form of thin and weakly cohesive chromitite stringers that can vary in number and height above a stope. These stringers, in conjunction with shallow-dipping thrust faulting, endemic across the platinum-bearing reefs of the Bushveld Complex, affect the maximum span that can be safely mined. The paper describes the research that was carried out to determine the interaction of support with the rock mass in both conventional and mechanized workings, and provides insights into stable span determination where excavations are intersected by a shallow-dipping thrust structure. Four important issues are highlighted. 1. Mine pole and pack support has a greater influence on stability than span in the context of the studied database for conventional mines. 2. Shallow-dipping discontinuities are a dominant feature in stability analyses. 3. The height of the vertical tensile zone does not restrict the fallout height if persistent shallow-dipping structures are present. 4. In the context of the numerical modelling shown in the paper, a span of 6 m is safe when 1.8 m long, full-column resin bolts are used at a support resistance of 48 kN/m2, regardless of the k-ratio or height of the triplets (intersections must be dealt with separately). Several leading practices have been developed in recent years to identify and timeously support hazardous structures. en_ZA
dc.language.iso en en_ZA
dc.publisher The Southern African Institute of Mining and Metallurgy. en_ZA
dc.rights © 2018. The Southern African Institute of Mining and Metallurgy, This Journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge. en_ZA
dc.subject Thrust fault en_ZA
dc.subject Dome structure en_ZA
dc.subject Stable span en_ZA
dc.subject Triplets en_ZA
dc.subject Conventional mining en_ZA
dc.subject Mechanized mining en_ZA
dc.subject UG2 Reef en_ZA
dc.subject Vertical tensile zone en_ZA
dc.subject Excavation en_ZA
dc.title Determination of stable spans in UG2 excavations. en_ZA
dc.type Article en_ZA
dc.journal.volume 118 en_ZA
dc.journal.title Journal of the Southern African Institute of Mining and Metallurgy . en_ZA
dc.description.librarian MvdH2018 en_ZA
dc.citation.doi 10.17159/2411-9717/2018/v118n5a6 en_ZA
dc.citation.epage 504 en_ZA
dc.citation.issue 5 en_ZA
dc.citation.spage 493 en_ZA


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