STP670: Analysis of Load Tests on Instrumented Steel Test Piles in Compressible Silty Soil

    Bozozuk, M
    Senior research officer, National Research Council of Canada, Ottawa, Ontario

    Keenan, GH
    Head, New Brunswick Department of Transportation, New Brunswick

    Pheeney, PE
    Geotechnical engineer, New Brunswick Department of Transportation, New Brunswick

    Pages: 28    Published: Jan 1979


    Abstract

    Axial compression and tension tests were performed on two end-bearing piles (one pipe and one H-pile) and two friction piles (one pipe and one H-pile) 3 months after they were driven through a granular test fill into compressible clayey silts. In analyzing the behavior of the piles, skin friction equations were developed based upon effective stresses in the soil, the soil-pile friction factor and the Poisson's ratio of the pile. These equations satisfactorily estimated the distribution of negative skin friction loads mobilized on the piles before they were test loaded and the skin friction mobilized in the axial compression and tension pile tests at failure. The equations were also applied to some well-documented pile tests, and showed that the skin friction that can be mobilized to resist axial compression loading can be estimated from pullout tests. This paper discusses the pile test procedures and the observed relative movements between the pile tips and the surrounding soil at various loads applied to the piles and describes a laboratory test method for measuring the coefficient of friction between the pile and the soil.

    Keywords:

    test fill, pile tests, axial compression, axial tension or pullout, negative skin friction, positive skin friction, effective stress, coefficient of soil-pile friction, Poisson's ratio, relative pile tip settlement


    Paper ID: STP33727S

    Committee/Subcommittee: D18.05

    DOI: 10.1520/STP33727S


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