The Phenomenon of Sample Tube Plugging

    Published: Jan 1985

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    In order to overcome the limited recovered lengths and sample disturbance associated with driven sampling, long stroke hydraulic push or piston samplers have been developed for offshore operations in recent years. Use of such samplers, however, does not always result in recovered sample lengths consistent with the distance pushed. A detailed review of sample recovery for several offshore investigations has shown this phenomenon to be common to all soil types.

    It is demonstrated that the recovered sample lengths can be predicted to a high degree of accuracy by comparing the friction resistance developed on the inside of the tubes with the soil bearing capacity as determined from cone penetrometer tests.

    Implications of the findings are discussed with particular reference to sample disturbance.


    marine geology, plug samplers, sample disturbance, hydraulic push sampling

    Author Information:

    Holt, JR
    Director and project engineer, Fugro Limited, Hemel Hempstead, Herts

    Ims, BW
    Director and project engineer, Fugro Limited, Hemel Hempstead, Herts

    Committee/Subcommittee: D18.02

    DOI: 10.1520/STP36336S

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