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Application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore
As the human need for ocean resources accelerates, offshore geotechnics continues to grow and become ever more relevant. Seabed soil sampling is crucial in deep-water engineering projects or geological studies where a detailed knowledge of the seabed geology is required. Deep-sea vibrocoring is a re...
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| Format: | Thesis |
| Language: | English |
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Department of Civil Engineering
2017
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| _version_ | 1867613343321161728 |
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| access_status_str | Open Access |
| author | Wegener, Sam Bryant |
| author2 | Kalumba, Denis |
| author_browse | Kalumba, Denis Wegener, Sam Bryant |
| author_facet | Kalumba, Denis Wegener, Sam Bryant |
| author_sort | Wegener, Sam Bryant |
| collection | Thesis |
| description | As the human need for ocean resources accelerates, offshore geotechnics continues to grow and become ever more relevant. Seabed soil sampling is crucial in deep-water engineering projects or geological studies where a detailed knowledge of the seabed geology is required. Deep-sea vibrocoring is a relatively new offshore sampling technique. The system consists of a vertical, tubular core barrel with a sharp cutting edge at its lower end vibrated into the seabed by a high-frequency, low-amplitude vibratory motor. In the past, success of a coring operation has been judged primarily by the length of the recovered core. More recently, studies have given focus to the problems associated with achieving soil specimens in which the in-situ sedimentary structure is preserved. In practice, the core recovery ratio - defined as the ratio between the sampled length of core sediment and the length of core barrel penetrated into the soil - is frequently less than unity. Literature suggests that the physical processes governing the dynamic interaction between core barrel and soil are poorly understood. Through review of relevant literature, and the execution of both physical testing and numerical modelling, this study aimed to a) Develop a calibrated 30 discrete element model of a given vibrocore-soil system, and b) Investigate the soil mechanics phenomena influencing the disturbance and recovery of vibrocore soil samples. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/24303 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:38.153Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| 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:11427/24303 Application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore Wegener, Sam Bryant Kalumba, Denis Lai Sang, Johnny Raubenheimer, Gert Civil Engineering As the human need for ocean resources accelerates, offshore geotechnics continues to grow and become ever more relevant. Seabed soil sampling is crucial in deep-water engineering projects or geological studies where a detailed knowledge of the seabed geology is required. Deep-sea vibrocoring is a relatively new offshore sampling technique. The system consists of a vertical, tubular core barrel with a sharp cutting edge at its lower end vibrated into the seabed by a high-frequency, low-amplitude vibratory motor. In the past, success of a coring operation has been judged primarily by the length of the recovered core. More recently, studies have given focus to the problems associated with achieving soil specimens in which the in-situ sedimentary structure is preserved. In practice, the core recovery ratio - defined as the ratio between the sampled length of core sediment and the length of core barrel penetrated into the soil - is frequently less than unity. Literature suggests that the physical processes governing the dynamic interaction between core barrel and soil are poorly understood. Through review of relevant literature, and the execution of both physical testing and numerical modelling, this study aimed to a) Develop a calibrated 30 discrete element model of a given vibrocore-soil system, and b) Investigate the soil mechanics phenomena influencing the disturbance and recovery of vibrocore soil samples. 2017-05-16T07:55:21Z 2017-05-16T07:55:21Z 2015 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/24303 eng application/pdf Department of Civil Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Civil Engineering Wegener, Sam Bryant Application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore |
| thesis_degree_str | Master's |
| title | Application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore |
| title_full | Application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore |
| title_fullStr | Application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore |
| title_full_unstemmed | Application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore |
| title_short | Application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore |
| title_sort | application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore |
| topic | Civil Engineering |
| url | http://hdl.handle.net/11427/24303 |
| work_keys_str_mv | AT wegenersambryant applicationofadiscreteelementmodeltotheanalysisofgranularsoilrecoveryinanoffshoretubularvibrocore |