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An investigation into the mechanisms of time dependent deformation of hard rocks
Dissertation (MSc (Mine Strata Control))--University of Pretoria, 2006.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613618473795584 |
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| access_status_str | Open Access |
| author2 | Handley, M.F. |
| author_browse | Handley, M.F. |
| author_facet | Handley, M.F. |
| collection | Thesis |
| dc_rights_str_mv | © 2002, 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 (MSc (Mine Strata Control))--University of Pretoria, 2006. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/26114 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:00.799Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| 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:2263/26114 An investigation into the mechanisms of time dependent deformation of hard rocks Handley, M.F. upetd@up.ac.za Drescher, Karsten Mineral industries Rock excavation Mining engineering Rock mechanics UCTD Dissertation (MSc (Mine Strata Control))--University of Pretoria, 2006. The testing undertaken for this dissertation is intended to help quantify the various time-dependant deformation processes around typical deep level hard rock tabular excavations. Three mechanisms were investigated and two different hard rock types, Ventersdorp Lava and Elsburg Quartzite were used. Uniaxial compression creep studies were done as the first part of the study followed by shear creep studies on discontinuities where crushed lava and crushed quartzite as well as a natural gouge were used as infilling. An important conclusion made is that the relationship between grain size and infilling thickness is more important than previously might have been assumed. The last part of the study consisted of triaxial post-failure relaxation tests. As far as could be determined, this is the first time triaxial post-failure tests were attempted, particularly on typical South African hard rocks. An important finding of this study is that during compression creep as well as during triaxial post-failure relaxation the amount of energy dissipated for the lava is significantly less than for quartzite. For mines operating at great depth (more than 2000m) the implication is that the rock material might relax much more slowly than might have been assumed and this means that after failure the rock mass continues to store large amounts of strain energy. This study provides the first data available for energy change calculations in fractured rock masses. Three mechanisms of time-dependant deformation were quantified providing valuable data for numerical investigations. Mining Engineering unrestricted 2013-09-07T02:34:27Z 2005-07-20 2013-09-07T02:34:27Z 2003-04-01 2006-07-20 2005-07-08 Dissertation Drescher, K 2002, An investigation into the mechanisms of time dependent deformation of hard rocks, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/26114 > H504/ag http://hdl.handle.net/2263/26114 http://upetd.up.ac.za/thesis/available/etd-07082005-141037/ © 2002, 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 | Mineral industries Rock excavation Mining engineering Rock mechanics UCTD An investigation into the mechanisms of time dependent deformation of hard rocks |
| title | An investigation into the mechanisms of time dependent deformation of hard rocks |
| title_full | An investigation into the mechanisms of time dependent deformation of hard rocks |
| title_fullStr | An investigation into the mechanisms of time dependent deformation of hard rocks |
| title_full_unstemmed | An investigation into the mechanisms of time dependent deformation of hard rocks |
| title_short | An investigation into the mechanisms of time dependent deformation of hard rocks |
| title_sort | investigation into the mechanisms of time dependent deformation of hard rocks |
| topic | Mineral industries Rock excavation Mining engineering Rock mechanics UCTD |
| url | http://hdl.handle.net/2263/26114 http://upetd.up.ac.za/thesis/available/etd-07082005-141037/ |