Evaluating five mine residue disposal facility case studies using a limit equilibrium method of slices.

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dc.contributor.advisorMacRobert, Charlesen_ZA
dc.contributor.authorGreyling, Deonen_ZA
dc.contributor.otherStellenbosch University. Faculty of Engineering. Dept. of Civil Engineering.en_ZA
dc.date.accessioned2024-02-27T20:06:11Zen_ZA
dc.date.accessioned2024-04-26T13:19:11Zen_ZA
dc.date.available2024-02-27T20:06:11Zen_ZA
dc.date.available2024-04-26T13:19:11Zen_ZA
dc.date.issued2024-03en_ZA
dc.descriptionThesis (MEng)--Stellenbosch University, 2024.en_ZA
dc.description.abstractENGLISH ABSTRACT: In this study, five slope failure case studies, associated with mine waste facilities, such as Tailings Storage Facilities and Waste Rock Dumps, are evaluated using the Morgenstern-Price Limit Equilibrium Method of Slices. The available information of each study has been studied and key information about its investigation, soil test work, pre-failure slope geometry, and the piezometric surface have been extracted to develop a set of limit equilibrium slope stability models. The models were used to search for the critical slip surface and to back-calculate the shear strength of the critical soil region that satisfies a computed factor of safety of unity. The critical slip surfaces, determined from the limit equilibrium models, closely resemble the observed performance of the studied slopes. The back-calculated shear strength parameters of the critical soil region are compared to shear strength parameters derived from laboratory test results and typical values published in the literature. The back-calculated values compared well to the shear strength values published in the literature for similar soils. However, in two cases the back-calculated values did not compare well to values derived from laboratory test results. In both cases, direct shear tests were completed on fine-grained soil, which may have led to erroneous results. In two case studies, the back-calculated values compared well to the test results, and in another, the back-calculated shear strength is between the peak and residual shear strengths derived from laboratory test results. For three case studies, an additional analysis was done where two empirical correlations was used to specify the fully softened shear strength and residual shear strength of finegrained soil. The results of the slope stability models showed that the stability of the slopes is sensitive to the porewater pressure regime, emphasising that it should always be appropriately accounted for in the analysis of a slope that has a consequence of failure. Furthermore, the results of the analyses highlight that the engineering properties of the soils comprising the slope and its foundation should be sufficiently characterised and verified through appropriate geotechnical laboratory and in situ test work. The analyses affirm that the Morgenstern-Price Limit Equilibrium Method of Slices is a suitable tool to investigate slope stability provided that the piezometric surface, soil parameters and slope geometry are accurately defined.en_ZA
dc.description.abstractAFRIKAANSE OPSOMMING: In hierdie studie word vyf gevallestudies van hellingmislukkings, wat verband hou met mynstortingfasiliteite soos Slikdame en Afvalrotsstortings, geëvalueer met behulp van die Morgenstern-Price Beperk Ewewigsmetode van Snye. Die beskikbare inligting van elke studie is bestudeer en sleutelinligting oor die ondersoek, grondtoetse, voormislukkinghellinggeometrie, en die piezometriese oppervlak is onttrek om 'n stel limiet ewewig hellingstabiliteit modelle te ontwikkel. Die modelle is gebruik om die kritieke glyvlak te soek en om die skuifsterkte van die kritieke grondgebied wat 'n berekende veiligheidsfaktor (FS) van eenheid bevredig, terug te bereken. Die kritieke glyvlakke, bepaal uit die grenstoestandsmodelle, lyk naby aan die waargenome prestasie van die bestudeerde hellinge. Die terugberekende skuifsterkteparameters van die kritieke grondgebied word vergelyk met skuifsterkteparameters wat afgelei is uit laboratoriumtoetsresultate en tipiese waardes wat in die literatuur gepubliseer is. Die terugberekende waardes het goed vergelyk met skuifsterktewaardes wat gepubliseer is in die literatuur vir soortgelyke grond, maar in twee gevalle het die terugberekende waardes nie goed vergelyk met waardes wat uit laboratoriumtoetsresultate afgelei is nie. In beide gevalle is direkte skuiftoetse op fyn-korrelige grond gedoen, wat moontlik tot foutiewe resultate kon lei. In twee gevallestudies het die terugberekende waardes goed vergelyk met die toetsresultate, en in 'n ander is die terugberekende skuifsterkte tussen die piek- en residuële skuifsterktes wat uit laboratoriumtoetsresultate afgelei is. Vir drie gevallestudies is 'n addisionele analise gedoen waar 'n empiriese korrelasie gebruik is om die volledig versagte skuifsterkte van fyn-korrelige grond te spesifiseer. In hierdie gevalle het die berekende FS eenheid oorskry. Die resultate van die hellingstabiliteitsmodelle het getoon dat die stabiliteit van die hellinge sensitief is vir die porie-waterdruk regime, wat beklemtoon dat dit altyd toepaslik in ag geneem moet word in die ontleding van 'n helling wat 'n gevolg van mislukking het. Verder beklemtoon die resultate van die analises dat die ingenieurs-eienskappe van die grond wat die helling en sy fondasie uitmaak voldoende gekarakteriseer moet word en geverifieer moet word deur toepaslike geotegniese laboratorium- en insitu-toetswerk. Die analises bevestig dat die Morgenstern-Price Beperk Ewewigsmetode van Snye 'n geskikte instrument is om hellingstabiliteit te ondersoek mits die piezometriese oppervlak, grondparameters en hellinggeometrie akkuraat gedefinieer is.af_ZA
dc.description.versionMastersen_ZA
dc.format.extentxii, 106 pages : illustrationsen_ZA
dc.identifier.urihttps://scholar.sun.ac.za/handle/10019.1/130320en_ZA
dc.language.isoen_ZAen_ZA
dc.language.isoen_ZAen_ZA
dc.publisherStellenbosch : Stellenbosch Universityen_ZA
dc.rights.holderStellenbosch Universityen_ZA
dc.subject.lcshSlopes (Soil mechanics) -- Stabilityen_ZA
dc.subject.lcshLimit equilibrium methoden_ZA
dc.subject.lcshTailings embankmentsen_ZA
dc.subject.lcshShear strength of soilsen_ZA
dc.titleEvaluating five mine residue disposal facility case studies using a limit equilibrium method of slices.en_ZA
dc.typeThesisen_ZA
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