Abstract
Shallow slides in cohesionless till occurred in several highway fills in the province of Quebec, Canada, following spring thaw and sometimes during rainy autumns. This study has shown that the strength parameters of cohesionless tills can be related to the liquid limit for both drained and undrained conditions. These relationships can be used as input in stability analyses to readily yield design values of stable slopes. Tills with liquid limits between 15% and 25% are all very susceptible to liquefaction flow failures if loosely compacted and saturated. To reduce the risk of shallow slides in the cohesionless till embankments used for highways, a stabilizing coarse-grained fill placed atop of the till embankment appears to be an efficient technique. Design charts of minimum thickness of the stabilizing fill at the base of the till slope were developed using available stability programs and an empirically derived strength of liquefied tills.Key words: cohesionless, till, liquefaction, stability, slope, skin.
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