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    Expendable Doppler Penetrometer for Deep Ocean Sediment Measurements

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    This paper describes an expendable dynamic penetrometer for measuring seafloor penetrability and undrained shear strength at water depths to 6000 m. The components of the penetrometer are described, procedures for its use are given, and a method for determining soil strength from penetrometer data is presented. In addition, the results of penetrometer tests in seafloor, clays, oozes, and silts are presented. Shear strength results derived from the penetrometer data are compared to other in-situ or laboratory shear strength data. The objective in developing the dynamic penetrometer was to provide an expedient means for determining seafloor characteristics and properties relevant to site selection and geotechnical design.


    marine geology, shear strength, soil tests, seafloor sediments, dynamic penetrometer

    Author Information:

    Beard, RM
    Project engineer, Buena Engineers, Ventura, CA

    Committee/Subcommittee: D18.02

    DOI: 10.1520/STP36332S