## Vibration problems of skips in mine shafts : the effect of compressive forces in the guides

 dc.contributor.author Pretorius, T S en_ZA dc.date.accessioned 2016-04-12T09:34:48Z dc.date.available 2016-04-12T09:34:48Z dc.date.issued 1989 en_ZA dc.description.abstract 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. en_ZA dc.identifier.apacitation Pretorius, T. S. (1989). Vibration problems of skips in mine shafts : the effect of compressive forces in the guides. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/18790 en_ZA dc.identifier.chicagocitation Pretorius, T S. "Vibration problems of skips in mine shafts : the effect of compressive forces in the guides." Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1989. http://hdl.handle.net/11427/18790 en_ZA dc.identifier.citation Pretorius, T. 1989. Vibration problems of skips in mine shafts : the effect of compressive forces in the guides. University of Cape Town. en_ZA dc.identifier.ris TY - Thesis / Dissertation AU - Pretorius, T S AB - 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. DA - 1989 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1989 T1 - Vibration problems of skips in mine shafts : the effect of compressive forces in the guides TI - Vibration problems of skips in mine shafts : the effect of compressive forces in the guides UR - http://hdl.handle.net/11427/18790 ER - en_ZA dc.identifier.uri http://hdl.handle.net/11427/18790 dc.identifier.vancouvercitation Pretorius TS. Vibration problems of skips in mine shafts : the effect of compressive forces in the guides. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1989 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18790 en_ZA dc.language.iso eng en_ZA dc.publisher.department Department of Civil Engineering en_ZA dc.publisher.faculty Faculty of Engineering and the Built Environment dc.publisher.institution University of Cape Town dc.subject.other Civil Engineering en_ZA dc.subject.other Mining haulage en_ZA dc.subject.other Shuttle cars (Mine haulage) en_ZA dc.title Vibration problems of skips in mine shafts : the effect of compressive forces in the guides en_ZA dc.type Master Thesis dc.type.qualificationlevel Masters dc.type.qualificationname MSc en_ZA uct.type.filetype Text uct.type.filetype Image uct.type.publication Research en_ZA uct.type.resource Thesis en_ZA
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