Determination of stable spans in UG2 excavations.

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dc.citation.doi10.17159/2411-9717/2018/v118n5a6en_ZA
dc.citation.epage504en_ZA
dc.citation.issue5en_ZA
dc.citation.spage493en_ZA
dc.contributor.authorWatson, B.P.
dc.contributor.authorGerber, R.
dc.date.accessioned2018-08-24T06:22:42Z
dc.date.available2018-08-24T06:22:42Z
dc.date.issued2018-05
dc.description.abstractThe 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.description.librarianMvdH2018en_ZA
dc.identifier.citationWatson, 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.issn2225-6253
dc.identifier.other10.17159/2411-9717/2018/v118n5a6
dc.identifier.urihttps://hdl.handle.net/10539/25473
dc.journal.titleJournal of the Southern African Institute of Mining and Metallurgy .en_ZA
dc.journal.volume118en_ZA
dc.language.isoenen_ZA
dc.publisherThe 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.subjectThrust faulten_ZA
dc.subjectDome structureen_ZA
dc.subjectStable spanen_ZA
dc.subjectTripletsen_ZA
dc.subjectConventional miningen_ZA
dc.subjectMechanized miningen_ZA
dc.subjectUG2 Reefen_ZA
dc.subjectVertical tensile zoneen_ZA
dc.subjectExcavationen_ZA
dc.titleDetermination of stable spans in UG2 excavations.en_ZA
dc.typeArticleen_ZA
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