Influence of Residual Dyke Strength on Dyke Reliability Using the Random Material Point Method

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Abstract

The material point method (MPM) is used to model both rotational and horizontal sliding failure mechanisms of dykes under external (water) loading. To model the different failure mechanisms, an external hydrostatic water pressure has been applied on the canal side of the dyke by applying a newly developed boundary condition. The boundary condition detects the material boundary and distributes the applied load to the nodes of the background mesh. The definition of dyke failure has also been investigated using MPM. In conventional dyke assessment, using (for example) the finite element method (FEM), the dyke is considered to have failed as soon as an initial failure occurs. However, the dyke may still be able to resist the flow of water, and this continuing ability to resist water flow is known as residual dyke strength. By taking account of residual dyke strength, for example with MPM as shown in this paper, the computed reliability can increase compared to conventional assessment, as in some cases total dyke failure does not occur after an initial slope failure. Finally, spatial variability is considered using the random material point method (RMPM), which combines random fields with MPM in a Monte Carlo framework. When considering spatial variability, a significant gain in reliability due to residual dyke strength has been observed, but further investigation is required to fully understand the effect of spatial variability on residual dyke strength. In order to simplify this preliminary investigation, the adopted soil properties in this paper have not been based on actual soils used in dyke construction; the results are only intended to indicate the capabilities of RMPM and develop hypotheses on the effect of residual dyke strength.
Original languageEnglish
Title of host publicationProceedings of the 7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019)
Subtitle of host publicationState-of-the-Practice in Geotechnical Safety and Risk
EditorsJianye Ching, Dian-Qing Li, Jie Zhang
Place of PublicationTaipei, Taiwan
Pages775-780
Number of pages6
ISBN (Electronic)978-981-11-2725-0
DOIs
Publication statusPublished - 2019
EventISGSR 2019: 7th International Symposium on Geotechnical Safety and Risk - National Taiwan University of Science and Technology, Taipei, Taiwan
Duration: 11 Dec 201913 Dec 2019
http://isgsr2019.org/

Conference

ConferenceISGSR 2019: 7th International Symposium on Geotechnical Safety and Risk
Abbreviated titleISGSR 2019
CountryTaiwan
CityTaipei
Period11/12/1913/12/19
Internet address

Keywords

  • Dyke breach
  • dyke reliability
  • residual strength
  • RMPM
  • ultimate limit state

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  • Cite this

    Remmerswaal, G., Hicks, M., & Vardon, P. (2019). Influence of Residual Dyke Strength on Dyke Reliability Using the Random Material Point Method. In J. Ching, D-Q. Li, & J. Zhang (Eds.), Proceedings of the 7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019): State-of-the-Practice in Geotechnical Safety and Risk (pp. 775-780). [IS4-4]. https://doi.org/10.3850/978-981-11-2725-0 IS4-4-cd