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Identifying instability in the rock mass caused by water ingress into abandoned mines
Dissertation (MSc)--University of Pretoria, 2014.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2015
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| _version_ | 1867613689955221504 |
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| access_status_str | Open Access |
| author2 | Kijko, Andrzej |
| author_browse | Kijko, Andrzej |
| author_facet | Kijko, Andrzej |
| collection | Thesis |
| dc_rights_str_mv | © 2014 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)--University of Pretoria, 2014. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/43228 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:08.978Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| 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:2263/43228 Identifying instability in the rock mass caused by water ingress into abandoned mines Kijko, Andrzej dbirch@geoscience.org.za Cichowicz, A. Birch, Denver Julian UCTD Dissertation (MSc)--University of Pretoria, 2014. The recent increase in seismic activity in the Central Rand Basin of South Africa was investigated using two different approaches. The closure of mines throughout the basin has left a large underground void behind that has rapidly filled with water, polluted by mine workings. There is concern over the possible triggering of a large earthquake beneath the city of Johannesburg. Questions surrounding the mechanism and nature of the seismicity still persist. Two approaches were selected to uncover early clues about the seismicity and possibly shed some light on future expectations. The first approach was an analysis of the frequency-magnitude distribution (b-value) over time, while the second approach was an attempt at building a 3-dimensional geomechanical model to describe a possible driving force behind the seismicity. Results from a temporal b-value analysis show a strong correlation with a drop in the b-value and the onset of the largest events in the database. This is explained by the relationship between the b-value and physical properties of the rock mass. An overall decrease in the b-value was estimated since flooding started, indicating a shift towards a higher proportion of larger events. The 3-dimensional geomechanical model provided a measure of the stresses and shear displacements that occur where geological discontinuities intersect the mine workings. This was compared to previous estimates of stress measurements in the mines and maximum possible magnitude estimations. The spatial distribution of recent, relocated seismicity was described in terms of the results from the model, which identified unstable geological features. The distribution of these features matched the seismic clusters that were observed, which provided some insight into the current tectonic setting of the Central Rand Basin. lk2014 Physics MSc Unrestricted 2015-01-19T12:13:12Z 2015-01-19T12:13:12Z 2014/12/12 2014 Dissertation Birch, DJ 2014, Identifying instability in the rock mass caused by water ingress into abandoned mines, MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/43228> M14/9/141 http://hdl.handle.net/2263/43228 en © 2014 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 Identifying instability in the rock mass caused by water ingress into abandoned mines |
| title | Identifying instability in the rock mass caused by water ingress into abandoned mines |
| title_full | Identifying instability in the rock mass caused by water ingress into abandoned mines |
| title_fullStr | Identifying instability in the rock mass caused by water ingress into abandoned mines |
| title_full_unstemmed | Identifying instability in the rock mass caused by water ingress into abandoned mines |
| title_short | Identifying instability in the rock mass caused by water ingress into abandoned mines |
| title_sort | identifying instability in the rock mass caused by water ingress into abandoned mines |
| topic | UCTD |
| url | http://hdl.handle.net/2263/43228 |