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2019 | OriginalPaper | Buchkapitel

Effects of Void Ratio and Hydraulic Gradient on Permeability and Suffusion of Glacial Till Cores

verfasst von : Ingrid Silva, Peter Viklander, Jan Laue

Erschienen in: Internal Erosion in Earthdams, Dikes and Levees

Verlag: Springer International Publishing

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Abstract

Dams with core of broadly graded glacial moraines (tills) exhibit signs of internal erosion by suffusion to a larger extent than dams constructed with other types of materials, as reported by Sherard (1979). Garner and Fannin (2010) indicated that internal erosion initiates when an unfavorable combination of soil material, stress conditions and hydraulic load occur. A laboratory program, carried out at Luleå University of Technology (LTU), aims to study the effects of void ratio and hydraulic gradient on the initiation of suffusion of glacial till. It consists of suffusion tests conducted in permeameters with an inner diameter 101.6 mm and a height of 115 mm. Results show, as expected, that the hydraulic conductivity is lower with lower void ratio. Nevertheless, as the hydraulic gradient increases, the hydraulic conductivity reaches steady values. Changes in the hydraulic conductivity suggest variation in the initial void ratio due to detachment of the finer particles from the soil matrix. These fine particles start clogging the lower layers, therefore the rate of water flow decreases and so does the hydraulic conductivity. The hydraulic gradient for which the hydraulic conductivity reaches steady values is considered as the upper limit without suffusion evolved.

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Metadaten
Titel
Effects of Void Ratio and Hydraulic Gradient on Permeability and Suffusion of Glacial Till Cores
verfasst von
Ingrid Silva
Peter Viklander
Jan Laue
Copyright-Jahr
2019
DOI
https://doi.org/10.1007/978-3-319-99423-9_10