Progressive deformation of glacial till due to viscoplastic straining and pore pressure variation

R. Harley, V. Sivakumar, D. Hughes, M. R. Karim, S. L. Barbour

    Research output: Contribution to conferencePaper


    The stress regime in a cutting (slope) is complex, with different principle stresses acting in different directions along the potential failure plane. For example, stresses may be primarily in extension near the toe and in compression near the crest of a slope. Cuttings in heavily overconsolidated clays are known to be susceptible to progressive failure which usually starts at the toe of the slope. Softening and the development of rupture surfaces have been observed in the field and are well documented for London Clays. However, this failure mechanism is yet to be established for glacial tills. To better understand the progressive failure mechanism, this paper discusses a series of laboratory tests conducted on reconstituted glacial till samples from Northern Ireland. Initial observations indicate that, a soil with insitu stress states between 80-90% of peak strength may undergo significant viscoplastic straining as a result of the combination of pore-pressure cycling and elevated stress level.
    Original languageEnglish
    Number of pages5
    Publication statusPublished - Sep 2014
    EventGeoRegina 2014, 67th Canadian Geotechnical Conference - Saskatchewan, Regina, Canada
    Duration: 28 Sep 201401 Oct 2014


    ConferenceGeoRegina 2014, 67th Canadian Geotechnical Conference


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