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    Volume 39, Issue 2 (March 2016)

    In Situ Measurement of the Dynamic Penetration of Free-Fall Projectiles in Soft Soils Using a Low-Cost Inertial Measurement Unit

    (Received 2 July 2014; accepted 28 October 2015)

    Published Online: 2016

    CODEN: GTJOAD

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    Abstract

    Six degree-of-freedom motion data from projectiles free-falling through water and embedding in soft soil are measured using a low-cost inertial measurement unit, consisting of a tri-axis accelerometer and a three-component gyroscope. A comprehensive framework for interpreting the measured data is described and the merit of this framework is demonstrated by considering sample test data for free-falling projectiles that gain velocity as they fall through water and self-embed in the underlying soft clay. The paper shows the importance of considering such motion data from an appropriate reference frame by showing good agreement in embedment depth data derived from the motion data with independent direct measurements. Motion data derived from the inertial measurement unit are used to calibrate a predictive model for calculating the final embedment depth of a dynamically installed anchor.


    Author Information:

    Blake, Anthony P.
    Ph.D. Candidate, Centre for Offshore Foundation Systems, The Univ. of Western Australia, Perth,

    O'Loughlin, Conleth D.
    Associate Professor, Centre for Offshore Foundation Systems, The Univ. of Western Australia, Perth,

    Morton, John P.
    Ph.D. Candidate, Centre Centre for Offshore Foundation Systems, The Univ. of Western Australia, Perth,

    O'Beirne, Colm
    Ph.D. Candidate, Centre for Offshore Foundation Systems, The Univ. of Western Australia, Perth,

    Gaudin, Christophe
    Professor, Centre for Offshore Foundation Systems, The Univ. of Western Australia, Perth,

    White, David J.
    Professor, Centre for Offshore Foundation Systems, The Univ. of Western Australia, Perth,


    Stock #: GTJ20140135

    ISSN: 0149-6115

    DOI: 10.1520/GTJ20140135

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    Author
    Title In Situ Measurement of the Dynamic Penetration of Free-Fall Projectiles in Soft Soils Using a Low-Cost Inertial Measurement Unit
    Symposium , 0000-00-00
    Committee D18