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Steps as hydraulic roughness elements in segmentally lined tunnels
Thesis (MEng)--University of Stellenbosch, 2002.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867614001232347136 |
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| access_status_str | Open Access |
| author | Bester, J. W. |
| author2 | Rooseboom, A. |
| author_browse | Bester, J. W. Rooseboom, A. |
| author_facet | Rooseboom, A. Bester, J. W. |
| author_sort | Bester, J. W. |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--University of Stellenbosch, 2002. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/53062 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:45:04.096Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/53062 Steps as hydraulic roughness elements in segmentally lined tunnels Bester, J. W. Rooseboom, A. Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering. Hydraulic structures Tunnels -- Design and construction Water tunnels Dissertations -- Civil engineering Theses -- Civil engineering Thesis (MEng)--University of Stellenbosch, 2002. ENGLISH ABSTRACT: Segmentally lined tunnels are increasingly being built to transfer water from one water scheme to another. The segments that line such tunnels are often in the form of pre-cast concrete sections, which are placed around the perimeter of the tunnel. As these tunnels are very expensive to construct, it is imperative that their hydraulic capacities can be calculated accurately. Even a slight variation in the design diameter has a significant effect on the cost of the tunnel. Due to the construction method involved, alternative segments are not always properly aligned. This creates roughness elements in the tunnel commonly known as steps. These steps occur randomly and vary in size. Since the steps lead to increased roughness and thus decrease the hydraulic capacity of the tunnel, it is essential that this effect be allowed for in the design of the tunnel. A hydraulic model was used to determine the contribution of steps to the hydraulic roughness, according to step size and frequency of steps. AFRIKAANSE OPSOMMING: Tonnels word al hoe meer gebou om water tussen waterskemas te vervoer. Die voering van sulke tunnels word dikwels saamgestel uit voorafvervaardigde beton panele wat geplaas word om 'n huls langs die omtrek van die tonnel te vorm. Aangesien hierdie tonnels geweldig duur is om te bou, is dit uiters noodsaaklik dat die hidrouliese kapasiteit van 'n tonnel akkuraat bereken kan word. 'n Klein variasie in die diameter van die tonnel het 'n betekenisvolle effek op die koste daarvan. Die konstruksiemetode van sulke tonnels veroorsaak dat opeenvolgende panele nie altyd presies oplyn nie. Sulke afwykings in die belyning van die tonnelpanele veroorsaak klein trappies, wat bydra tot die ruheid in die tonne I en sodoende die kapasiteit daarvan laat afneem. Die afwykings varieer in grootte en kom in geen spesifieke patroon voor nie. 'n Modelstudie is uitgevoer om die bydrae wat die afwykings in the belyning van die opeenvolgende ringe tot die hidrouliese weerstand maak, te bepaal. 2012-08-27T11:35:16Z 2012-08-27T11:35:16Z 2002 Thesis http://hdl.handle.net/10019.1/53062 en_ZA Stellenbosch University 1 v. (various pagings) : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Hydraulic structures Tunnels -- Design and construction Water tunnels Dissertations -- Civil engineering Theses -- Civil engineering Bester, J. W. Steps as hydraulic roughness elements in segmentally lined tunnels |
| title | Steps as hydraulic roughness elements in segmentally lined tunnels |
| title_full | Steps as hydraulic roughness elements in segmentally lined tunnels |
| title_fullStr | Steps as hydraulic roughness elements in segmentally lined tunnels |
| title_full_unstemmed | Steps as hydraulic roughness elements in segmentally lined tunnels |
| title_short | Steps as hydraulic roughness elements in segmentally lined tunnels |
| title_sort | steps as hydraulic roughness elements in segmentally lined tunnels |
| topic | Hydraulic structures Tunnels -- Design and construction Water tunnels Dissertations -- Civil engineering Theses -- Civil engineering |
| url | http://hdl.handle.net/10019.1/53062 |
| work_keys_str_mv | AT besterjw stepsashydraulicroughnesselementsinsegmentallylinedtunnels |