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Experimental investigation of suffusion in dam core soils of glacial till
A laboratory experimental program on internal erosion was performed on 12 non-plastic glacial till specimens. Four were natural glacial tills sourced from the cores of four existing embankment dams in Sweden. The remaining eight were mixtures based on these tills with adjusted particle size distributions to obtain target gradations. The longest experiment ran for 77 days. The highest applied average gradient was 9.5, within the bounds of what could occur in dam cores. The objectives of the study were to determine the susceptibility of widely graded, non-plastic glacial till to suffusion and identify potential factors influencing susceptibility. Four specimens failed by the process of suffusion and, by comparing against stable specimens, gradations of low fines content (< ≈15–20%), low sand fraction (< ≈20%), and high gravel fraction (> ≈60%) are susceptible to suffusion. These grading characteristics are present in the coarse end of the envelope of glacial till cores in many existing dams. Furthermore, the laboratory study showed that the possible effects of suffusion include changes in hydraulic conductivity and temporal variations in gradient and head loss, which are relevant aspects to consider in dam engineering practices.
Experimental investigation of suffusion in dam core soils of glacial till
A laboratory experimental program on internal erosion was performed on 12 non-plastic glacial till specimens. Four were natural glacial tills sourced from the cores of four existing embankment dams in Sweden. The remaining eight were mixtures based on these tills with adjusted particle size distributions to obtain target gradations. The longest experiment ran for 77 days. The highest applied average gradient was 9.5, within the bounds of what could occur in dam cores. The objectives of the study were to determine the susceptibility of widely graded, non-plastic glacial till to suffusion and identify potential factors influencing susceptibility. Four specimens failed by the process of suffusion and, by comparing against stable specimens, gradations of low fines content (< ≈15–20%), low sand fraction (< ≈20%), and high gravel fraction (> ≈60%) are susceptible to suffusion. These grading characteristics are present in the coarse end of the envelope of glacial till cores in many existing dams. Furthermore, the laboratory study showed that the possible effects of suffusion include changes in hydraulic conductivity and temporal variations in gradient and head loss, which are relevant aspects to consider in dam engineering practices.
Experimental investigation of suffusion in dam core soils of glacial till
Rönnqvist, Hans (author) / Viklander, Peter / Knutsson, Sven
2016
Article (Journal)
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
Local classification TIB:
770/4815/6545
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