STP883: Some Aspects of the Behavior of Beaufort Sea Clays

    Jefferies, MG
    Supervising civil engineer, Gulf Canada Resources Inc., Calgary, Alberta

    Ruffell, JP
    Project director, EBA Engineering Consultants Ltd., Edmonton, Alberta

    Crooks, JHA
    Principal, Golder Associates, Calgary, Alberta

    Hughes, JMO
    Principal, Western Geosystems Inc., Vancouver, British Columbia

    Pages: 28    Published: Jan 1985


    Abstract

    Proper investigation of Beaufort Sea clays requires a combination of cone penetration and pressuremeter testing supplemented by a laboratory program that is consistent with the in-situ data. Neither in-situ nor laboratory testing on their own is sufficient to define the clay strength and behavior.

    These findings are demonstrated by the behavior of clay from the physiographic region known as the Kringalik Plateau, which has been the subject of comprehensive in-situ and laboratory testing. Two features stand out from the Kringalik clay testing. First, some of the clay units show K0 as large as two even though they are considered to be “normally consolidated” based on present geological understanding. Second, the deformation of these clays under stress changes imposed by a caisson retained island is such that serviceability conditions will probably govern island design rather than ultimate strength. Accordingly, the yield surfaces of the clays and their motion in stress space as a function of imposed stress paths together with associated strain behavior will be as important as the shear strength profile.

    Keywords:

    marine clay, yield strength, cone penetrometer, triaxial tests, Beaufort Shelf, Kringalik Plateau, in-situ testing, self-bored pressuremeter, caisson retained islands


    Paper ID: STP36354S

    Committee/Subcommittee: D18.02

    DOI: 10.1520/STP36354S


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