AN EXPERIMENTAL STUDY OF CONTACT EROSION BETWEEN A TILL CORE AND COARSER CREST AND FILTER MATERIALS

Pierre-Olivier Dionne, Jean-Marie Konrad

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Embankments and Dams / Remblais et barrages

ABSTRACT: Contact erosion is an internal erosion process found in embankment dams and dikes which can lead to failure. It is defined as the pullout and dragging of fines from a base material through an adjacent coarser material under seepage parallel to the interface. This study intends to understand and to identify the mechanisms that control contact erosion with a well-graded base soil (till) combined with different filter materials. To study the erosion process, a new experimental setup has been developed. It was found that the grading of the base material as an impact on the initiation and progression of erosion as different mechanisms such as paving and clogging can develop to limit or even stop the erosion. A conceptualization of the erosion process depending on the grain size of both filter and base soils and on the hydraulic solicitation is proposed.

RÉSUMÉ: Cette sion de contact avec un sol fin étalé (till) combiné à a été développé. Il important sur alors que different mécanismes comme le pavage et le colmatage peuvent en fonction de la dimension des particules du sol fin et du sol grossier ainsi que de la solicitation hydraulique est proposée.

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Cite this article:
Pierre-Olivier Dionne; Jean-Marie Konrad (2015) AN EXPERIMENTAL STUDY OF CONTACT EROSION BETWEEN A TILL CORE AND COARSER CREST AND FILTER MATERIALS in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.

@article{456,author = Pierre-Olivier Dionne; Jean-Marie Konrad,title = AN EXPERIMENTAL STUDY OF CONTACT EROSION BETWEEN A TILL CORE AND COARSER CREST AND FILTER MATERIALS,year = 2015}