Rate effects from pile shaft resistance measurements

Michael John Brown, Adrian Frank Luciano Hyde

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    To be able to properly analyse rapid load pile tests in clay soils (e.g., Statnamic) an understanding of the material's behaviour at elevated shearing rates is required, as clays demonstrate nonlinear shearing resistance as the rate of shearing increases. To determine the relationship between pile resistance under static and elevated rates of loading, rate effect parameters for viscous damping have historically been derived from pile head measurements on full scale pile tests. These parameters are then attributed to a soil type with little recognition of what aspects of a soil may give further variation to them. To study this variation a test pile was installed in glacial till and instrumented with strain gauged sister bars at various levels down the pile shaft. Direct measurements of pile shaft resistance in both rapid load and static pile tests show that derivation of average parameters from pile head readings masks the variation in rate effect along a pile shaft. The variation of rate effects along the pile shaft is apparently linked to in situ moisture content.
    Original languageEnglish
    Pages (from-to)425-431
    Number of pages7
    JournalCanadian Geotechnical Journal
    Volume45
    Issue number3
    DOIs
    Publication statusPublished - 2008

    Keywords

    • Statnamic
    • Piles
    • Rate effects
    • Shaft resistance
    • Clays
    • Damping

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  • Research Output

    • 11 Citations
    • 7 Conference contribution
    • 1 Commissioned report

    Comparing rapid load pile testing for driven and CFA piles in London Clay

    Brown, M. J. & Powell, J. J. M., 2012, Proceedings of the 9th International Conference on Testing and Design Methods for Deep Foundations. p. 281-288 8 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Open Access
    File
  • High penetration rate CPT to determine damping parameters for rapid load pile testing

    Brown, M. J. & Hyde, A. F. L., 4 Apr 2008, Geotechnical and Geophysical Site Characterisation: Proceedings of the 3rd International Conference on Site Characterization (ISC'3, Tapei, Taiwan, 1-4 April 2008. . Huang, A-B. & Mayne, P. W. (eds.). London: Taylor & Francis, p. 657-663 7 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • Activities

    • 1 Other membership
    • 1 Invited talk

    Yamaguchi University, Japan, Invited speaker: Rate effect behaviour of different clays from high speed triaxial element testing

    Michael Brown (Invited speaker)

    25 Sep 201826 Sep 2018

    Activity: Talk or presentation typesInvited talk

    British Standards Institute (External organisation)

    Michael John Brown (Chair)

    Mar 2014 → …

    Activity: Membership typesOther membership

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