STP1014: Design and Offshore Experience with an In-Situ Vane

    Geise, JM
    Project manager and staff engineer, Fugro Geotechnical Engineers B.V., AB Leidschendam,

    Hoope, Jt
    Project manager and staff engineer, Fugro Geotechnical Engineers B.V., AB Leidschendam,

    May, RE
    Staff engineer, Fugro Ltd., Hemel Hempstead,

    Pages: 19    Published: Jan 1988


    Abstract

    The design, development, and use offshore of a commercial in-situ vane, operated from a carrier tool downhole or from a seabed jacking system, is described. This vane is inserted into soil at a rate of 20 mm/s for both deployment modes. The vane is rotated at a constant speed of either 0.1 or 0.2°/s in cohesive soils having a maximum shear strength of 200 kPa. Using the hard-tie drill string heave compensating system, the first downhole vane test may be within about 0.75 m of the borehole base in very soft soils; if the hard-tie is not used, then the first test should be about 1.5 m below the borehole base to avoid soil disturbed by drilling. Standards developed for onshore vane testing can be used for offshore vane testing with few modifications.

    Keywords:

    drilling, field tests, instrumentation, shear strength, vane testing, ocean soil, standards


    Paper ID: STP10339S

    Committee/Subcommittee: D18.02

    DOI: 10.1520/STP10339S


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