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Considering strain compatibility in limit equilibrium analysis for three tailings materials
Dissertation (MEng (Civil Engineering))--University of Pretoria, 2021.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2021
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| _version_ | 1867613654668541952 |
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| access_status_str | Open Access |
| author2 | Jacobsz, Schalk Willem |
| author_browse | Jacobsz, Schalk Willem |
| author_facet | Jacobsz, Schalk Willem |
| collection | Thesis |
| dc_rights_str_mv | © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng (Civil Engineering))--University of Pretoria, 2021. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/80752 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:35.267Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/80752 Considering strain compatibility in limit equilibrium analysis for three tailings materials Jacobsz, Schalk Willem yashay.narainsamy@gmail.com Narainsamy, Yashay UCTD Geotechnical Engineering Slope Stability Limit Equilibrium Analysis Tailings Strain Compatibility Engineering, built environment and information technology theses SDG-06 SDG-06: Clean water and sanitation Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Dissertation (MEng (Civil Engineering))--University of Pretoria, 2021. Recent tailings dam failures around the world have highlighted the real risk posed by undrained slope failures. Undrained failures are fundamentally different to drained failures in the sense that different mechanisms are involved (i.e. a slope may be stable against drained failure but unstable against undrained failure). Popular methods to assess the stability of slopes against undrained failure involve the use of limit equilibrium analyses with both drained and undrained strengths assigned in the same analysis. A potential shortcoming of these methods is that no consideration is given to strain compatibility. In this study, a limit equilibrium based method where strain compatibility is maintained on the failure surface was developed. The method, referred to as the strain mobilisation method, considers a Mohr circle of stress at failure to determine the shear strength mobilised on the failure plane for use in the stability analysis as a function of the deviator stress imposed on the triaxial test result. The mobilisation of stress on a failure plane with strain was determined based on the stress-strain relationships observed during triaxial tests. A Factor of Safety (FoS) was used to express the stability of the slope as a function of the mobilised strain and the calculated FoS results obtained using the proposed method were compared to calculated FoS results using traditional methods. This was done for three tailings materials (gold, iron and platinum) for three specific hypothetical slopes. As an additional check, the proposed method was tested on Nerlerk sand, a well-known sand showing strain-softening behaviour during undrained shearing. It was found that, in general, as mobilised strain is increased, the FoS calculated using the proposed method converges to that of traditional methods so that there was no significant difference in calculated FoS between the current methods and the proposed method that does consider strain compatibility. This indicates that the proposed method provides FoS values comparable to those calculated using currently accepted methods where the failure surface passes predominantly through a single material type. For such a case, there does not appear to be a need to consider limit equilibrium methods where strain compatibility is maintained. The proposed method provides an indication of the amount of strain that may be expected to mobilise to provide the FoS. Given that this amount of strain is not excessive, the current methods which do not consider strain compatibility perform satisfactorily and can continue to be used Civil Engineering MEng (Civil Engineering) Unrestricted 2021-07-08T12:01:16Z 2021-07-08T12:01:16Z 2021 2021 Dissertation * S2021 http://hdl.handle.net/2263/80752 en © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Geotechnical Engineering Slope Stability Limit Equilibrium Analysis Tailings Strain Compatibility Engineering, built environment and information technology theses SDG-06 SDG-06: Clean water and sanitation Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Considering strain compatibility in limit equilibrium analysis for three tailings materials |
| title | Considering strain compatibility in limit equilibrium analysis for three tailings materials |
| title_full | Considering strain compatibility in limit equilibrium analysis for three tailings materials |
| title_fullStr | Considering strain compatibility in limit equilibrium analysis for three tailings materials |
| title_full_unstemmed | Considering strain compatibility in limit equilibrium analysis for three tailings materials |
| title_short | Considering strain compatibility in limit equilibrium analysis for three tailings materials |
| title_sort | considering strain compatibility in limit equilibrium analysis for three tailings materials |
| topic | UCTD Geotechnical Engineering Slope Stability Limit Equilibrium Analysis Tailings Strain Compatibility Engineering, built environment and information technology theses SDG-06 SDG-06: Clean water and sanitation Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure |
| url | http://hdl.handle.net/2263/80752 |