Journal article

An extended interpretation of the free-fall piezocone test in clay

SH Chow, CD O'Loughlin, DJ White, MF Randolph

Géotechnique | ICE PUBLISHING | Published : 2017


Seabed strength may be determined rapidly using free-fall penetrometers as the tool is simply released from above the sea-floor and penetrates under gravity into the seabed. The speed and ease of deployment relative to conventional ‘push-in’ penetrometers is attractive, with the trade-off of more complex interpretation. This paper considers two approaches for deducing the undrained shear strength from a slender conical tipped penetrometer. The first requires as input only the vertical acceleration of the penetrometer, where the soil strength is determined indirectly by considering the various forces acting on the penetrometer and solving the equation of motion. The second determines the undr..

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University of Melbourne Researchers


Awarded by University of Western Australia's ECM research development grant

Funding Acknowledgements

This work forms part of the activities of the Centre for Offshore Foundation Systems (COFS), currently supported as a node of the Australian Research Council's Centre of Excellence for Geotechnical Science and Engineering, and through the Fugro Chair in Geotechnics (held by the fourth author), the Lloyd's Register Foundation Chair and Centre of Excellence in Offshore Foundations and the Shell EMI Chair in Offshore Engineering (held by the third author). The work is funded by The University of Western Australia's ECM research development grant (P10300069) and the Remote Intelligent Geotechnical Seabed Surveys (RIGSS) Joint Industry Project, which is supported by Benthic Geotech, Fugro, Shell, Total and Woodside.