University of Twente Student Theses
Improved simple test to assess dike safety after failure of pipelines within a clay-covered dike
Akkerman, E.S. (2024) Improved simple test to assess dike safety after failure of pipelines within a clay-covered dike.
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| Abstract: | Failure of gas and water pipelines that lay in or in the close vicinity of dikes forms a potential risk to the safety of the dikes and the people who live behind them. The Legal Assessment Framework provides a simple test that can be used to make a quick distinction between pipes that can and possibly cannot lay safely close to a dike. Assessment of this simple test has resulted in the conclusion that it is not well-substantiated. The probability of pipe failure and the damage effects due to pipe failure are not appropriately integrated, such that concerns are that the simple test cannot fulfil its purpose. This thesis aims to construct an alternative simple test in which the probability of pipe failure and the damage effects due to pipe failure are integrated together. The research uses failure probability data of pipes together with equations and literature-substantiated assumptions to quantify the damage effects of pipe failure. The damage effects for pipe failure are calculated for a hypothetical dike cross-section. The failure probability of the damaged dike cross-section was calculated using the D-Stability and D-Geoflow models together with equations from the Legal Assessment Framework. The increase in failure probability of the damaged dike cross-section has been calculated with respect to the reference situation without pipe failure for gas and water pipes with varying diameter, pressure, and material. For each pipe, the increase in failure probability of the dike was determined and tested against a maximum allowable increase criterion. The findings were generalised for different pipe characteristic groups, and a new simple test was constructed from them. The new simple test is considerably more conservative than the presently available test, which means that fewer pipes can be considered safe according to the new test. This decreases the chance that the simple test falsely considers a pipe in the vicinity of a dike as safe. However, from a usability point of view, this is undesirable because it increases the time that is needed to assess the safety of many pipe types. |
| Item Type: | Essay (Bachelor) |
| Faculty: | ET: Engineering Technology |
| Programme: | Civil Engineering BSc (56952) |
| Link to this item: | https://purl.utwente.nl/essays/103836 |
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