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Vibration problems of skips in mine shafts : the effect of compressive forces in the guides
Investigations into problems involving the vibration of conveyances in deep mining shafts have led to the identification of 'slamming' as a significant event in the initiation of large perturbations in the motion of the skip. Slamming occurs when the flexible rollers on the skip which normally act o...
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| Format: | Thesis |
| Language: | English |
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Department of Civil Engineering
2016
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| _version_ | 1867613168959750144 |
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| access_status_str | Open Access |
| author | Pretorius, T S |
| author_browse | Pretorius, T S |
| author_facet | Pretorius, T S |
| author_sort | Pretorius, T S |
| collection | Thesis |
| description | Investigations into problems involving the vibration of conveyances in deep mining shafts have led to the identification of 'slamming' as a significant event in the initiation of large perturbations in the motion of the skip. Slamming occurs when the flexible rollers on the skip which normally act on the guides are inoperative. The primary concern is that this slamming event can give rise to large lateral loads on the shaft steelwork and is therefore a factor which limits the speed at which the skip can be drawn up the shaft. This study extends previous work to investigate the influence of compressive forces in the guides on the response of the skip and the steelwork. These forces are induced as a result of mining operations and lead to a decrease in the transverse stiffness of the guides. A mathematical model of the slamming event is formulated and a numerical solution for a specific case is performed. An alternative simplified solution is discussed and compared to the initial formulation, with the aim of facilitating the use of previous research results. A model to simulate the response of the skip when the skip rollers are functional is formulated, and numerical solutions of different examples are given. An important conclusion is that the compressive forces can significantly reduce the transverse stiffness of the guides, and should be taken into account in future designs. Bibliography: pages 86-88. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18790 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:52.071Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Civil Engineering |
| publisherStr | Department of Civil Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18790 Vibration problems of skips in mine shafts : the effect of compressive forces in the guides Pretorius, T S Civil Engineering Mining haulage Shuttle cars (Mine haulage) Investigations into problems involving the vibration of conveyances in deep mining shafts have led to the identification of 'slamming' as a significant event in the initiation of large perturbations in the motion of the skip. Slamming occurs when the flexible rollers on the skip which normally act on the guides are inoperative. The primary concern is that this slamming event can give rise to large lateral loads on the shaft steelwork and is therefore a factor which limits the speed at which the skip can be drawn up the shaft. This study extends previous work to investigate the influence of compressive forces in the guides on the response of the skip and the steelwork. These forces are induced as a result of mining operations and lead to a decrease in the transverse stiffness of the guides. A mathematical model of the slamming event is formulated and a numerical solution for a specific case is performed. An alternative simplified solution is discussed and compared to the initial formulation, with the aim of facilitating the use of previous research results. A model to simulate the response of the skip when the skip rollers are functional is formulated, and numerical solutions of different examples are given. An important conclusion is that the compressive forces can significantly reduce the transverse stiffness of the guides, and should be taken into account in future designs. Bibliography: pages 86-88. 2016-04-12T09:34:48Z 2016-04-12T09:34:48Z 1989 Master Thesis Masters MSc http://hdl.handle.net/11427/18790 eng application/pdf Department of Civil Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Civil Engineering Mining haulage Shuttle cars (Mine haulage) Pretorius, T S Vibration problems of skips in mine shafts : the effect of compressive forces in the guides |
| thesis_degree_str | Master's |
| title | Vibration problems of skips in mine shafts : the effect of compressive forces in the guides |
| title_full | Vibration problems of skips in mine shafts : the effect of compressive forces in the guides |
| title_fullStr | Vibration problems of skips in mine shafts : the effect of compressive forces in the guides |
| title_full_unstemmed | Vibration problems of skips in mine shafts : the effect of compressive forces in the guides |
| title_short | Vibration problems of skips in mine shafts : the effect of compressive forces in the guides |
| title_sort | vibration problems of skips in mine shafts the effect of compressive forces in the guides |
| topic | Civil Engineering Mining haulage Shuttle cars (Mine haulage) |
| url | http://hdl.handle.net/11427/18790 |
| work_keys_str_mv | AT pretoriusts vibrationproblemsofskipsinmineshaftstheeffectofcompressiveforcesintheguides |