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Response to downward seepage tests in glacial till with varying degrees of internal instability
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2016 (English)Conference paper, Presentation (Refereed)
Abstract [en]

This paper explores how varying degrees of internal instability of glacial till soils affects grading characteristics due to internal erosion. Glacial till is used as impervious core material in many parts of the world. Internal erosion initiates by backward erosion, suffusion, contact erosion and concentrated leak erosion. The initiation mechanism of suffusion relates to the internal instability of a gradation, and backward erosion to an unfiltered interface. Based on a laboratory experimental program on 12 non-plastic glacial till specimens, four of which were natural glacial tills sourced from four existing embankment dams in Sweden and the remaining eight were mixtures with gravel based on these tills, insight is obtained as to the consequences of the stability index (H/F)min of a gradation when subjected to a downward gradient. Six specimens were stable, four failed by suffusion and two by backward erosion. Aspects such as erosion mass loss and seepage behaviour are discussed. Pre- and post-test gradations, effects on grading characteristics like the coefficient of uniformity, Cu, and the d10, as well as the coefficient of curvature, Cz, are detailed. This study will show that with increasing internal instability, there is an increase in mass loss due to internal erosion (suffusion) and increase in local gradient and variation in head loss distribution compared to the internally stable specimen. Furthermore, as expected, the stability index (H/F)min is subordinate to the filter incompatibility for the specimens that failed by backward erosion

Place, publisher, year, edition, pages
2016.
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-40304Local ID: f613421f-ae2d-42d5-9a04-57c417f3b1ebOAI: oai:DiVA.org:ltu-40304DiVA: diva2:1013826
Conference
International Conference on Scour and Erosion : 12/09/2016 - 15/09/2016
Note
Upprättat; 2015; 20150901 (hayrof)Available from: 2016-10-03 Created: 2016-10-03

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Rönnqvist, Hans
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Mining and Geotechnical Engineering

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