SLIDING STABILITY OF LANDWARD SLOPE CLAY COVER LAYERS OF SEA DIKES SUBJECT TO WAVE OVERTOPPING

Andre van Hoven; Bianca Hardeman; Jentsje W. van der Meer; Gosse Jan Steendam

doi:10.9753/icce.v32.structures.5

No. 32 (2010), Coastal Structures

No. 32 (2010)

SLIDING STABILITY OF LANDWARD SLOPE CLAY COVER LAYERS OF SEA DIKES SUBJECT TO WAVE OVERTOPPING

Coastal Structures

https://doi.org/10.9753/icce.v32.structures.5

Published 2011-02-02

Andre van Hoven
Bianca Hardeman⁺⁻
Jentsje W. van der Meer
Gosse Jan Steendam

Andre van Hoven

Bianca Hardeman

Deltares

Jentsje W. van der Meer

Gosse Jan Steendam

Proceedings of the 32nd International Conference

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Keywords

sliding stability
sea dike
clay cover
infiltration
wave overtopping

How to Cite

van Hoven, A., Hardeman, B., van der Meer, J. W., & Steendam, G. J. (2011). SLIDING STABILITY OF LANDWARD SLOPE CLAY COVER LAYERS OF SEA DIKES SUBJECT TO WAVE OVERTOPPING. Coastal Engineering Proceedings, 1(32), structures.5. https://doi.org/10.9753/icce.v32.structures.5

Abstract

Sea dikes with landward slopes covered by grass and clay cover layers, subject to wave overtopping, can become unstable and slide. Sliding stability of the cover layer is caused by a decrease in shear strength due to an increase in pore pressure in and underneath the clay cover layer. This holds for both clay dikes and sand dikes with a clay cover layer. A method is presented to determine the potential pore pressure build up due to a storm event with wave overtopping. The method combines of the shelf knowledge and is supported by laboratory measurements and field measurements during prototype scale wave overtopping tests and sliding test on Dutch sea dikes. The method contains three steps: 1) determine the infiltration time, depending on the storm duration and the sea state; 2) determine the infiltration capacity of the dike slope, either by choosing a safe value or field measurement and 3) determine the potential pore pressure build up, determined by step 1) and 2) and the dike structure and geometry. The potential pore pressure build up can be used in the standard stability analyses tools published in Dutch guidelines on dike design and dike safety assessment.

https://doi.org/10.9753/icce.v32.structures.5

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References

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TAW 2001. Technisch Rapport Waterkerende Grondconstructies, Geotechnische aspecten van dijken, dammen en boezemkaden, Technische Advies Commissie voor de Waterkeringen (in Dutch);Technical Report on soil based water defences, geotechnical aspects of dikes, levees and regional defences. Technical Advisory Committee for Water Defences.

TAW 2002, Technical report on wave run-up and wave overtopping, Technical Advisory Committee for Water Defences, May 2002

TAW 1996, Technisch Rapport Klei voor Dijken (In Dutch), Technical report on the use of clay for dikes, Technical Advisory Committee for Water Defences, May 1996

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Van Hoven, A., Barends, F.B.J., 2010, A practical approach for infiltration tests, Proceedings FSST 2010

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Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.

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SLIDING STABILITY OF LANDWARD SLOPE CLAY COVER LAYERS OF SEA DIKES SUBJECT TO WAVE OVERTOPPING

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