STP883

    Shear Strength Properties of Some Deep-Sea Pelagic Sediments

    Published: Jan 1985


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    Abstract

    This paper describes the index and strength properties of a number of pelagic clayey silt and silty clay samples obtained from 14 locations in the ocean. The depth of the samples varied from a few centimetres to 55 m where water depths were more than 4000 m. The sediments were pelagic silts and clays of high plasticity with liquid limits as high as 227 and water contents as high as 388%. The vane shear strength varied from 5 to 13 kPa within the upper 60 cm of the soil profile and increased with depth. The su/σ′v ratios measured by laboratory vane shear test varied from 0.28 to 0.60 in the upper 25 m of sediment column, which appeared to be overconsolidated, and 0.22 in the deeper normally consolidated sediments. The corrected ratios measured by laboratory vane shear test varied from 0.28 to 0.60 in the upper 25 m of sediment column, which appeared to be overconsolidated, and 0.22 in the deeper normally consolidated sediments. The corrected su/σ′v values computed by the SHANSEP method varied from 0.34 for the deeper normally consolidated sediments to 1.1 for the near surface apparently overconsolidated sediments. The effective stress parameters were values computed by the SHANSEP method varied from 0.34 for the deeper normally consolidated sediments to 1.1 for the near surface apparently overconsolidated sediments. The effective stress parameters were c′ = 1 to 22 kPa and φ′ = 21° to 35°.

    Keywords:

    marine clay, shear strength, soil mechanics, deep sea pelagic sediments, marine geotechnique


    Author Information:

    Noorany, I
    Professor of civil engineering, San Diego State University, San Diego, CA


    Paper ID: STP36338S

    Committee/Subcommittee: D18.02

    DOI: 10.1520/STP36338S


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