On characteristic values and the reliability-based assessment of dykes
M. Hicks (TU Delft - Geo-engineering)
Divya Varkey (TU Delft - Geo-engineering)
Bram van den Eijnden (TU Delft - Geo-engineering)
Tom de Gast (TU Delft - Geo-engineering)
P. Vardon (TU Delft - Geo-engineering)
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Abstract
A case study involving the assessment and re-design of an existing dyke, founded on a layered soil, has compared deterministic analysis based on 5-percentile property values and a reliability-based random finite element analysis consistent with the requirements of Eurocode 7. The results show that a consideration of the spatial nature of soil variability generally leads to higher computed factors of safety and, for those dyke sections requiring remedial action, to more economic designs. Back-figured characteristic values are shown to be considerably higher than the 5-percentile soil properties; hence, a reduction in over-conservatism is achieved.