Comparison of rapid load pile testing of driven and CFA piles installed in high OCR clay

M.J. Brown, J.J.M. Powell

    Research output: Contribution to journalArticle

    3 Citations (Scopus)
    187 Downloads (Pure)

    Abstract

    The current analysis of rapid load tests (RLT) such as Statnamic is normally based upon empirical correlations with static pile tests in similar soils. In certain soil types, such as clays, the number of case studies used to develop analysis and allow selection of appropriate rate effect correction are limited. Due to these limitations, no distinction is made in the selection of correction factors between pile type and pile installation techniques. In clay soils it is well known that driven piles may have a significantly enhanced capacity over cast in situ piles of similar cross-section. To test the effect of pile installation techniques on RLT analysis, RLT testing and static testing were undertaken on precast driven concrete piles and cast in situ CFA piles installed in high plasticity London Clay. The results show that the installation technique does not appear to affect the magnitude of the rate effects, provided modifications are made to the analysis to account for the previously reported differences in static capacity between different installation techniques. Based upon the findings, it is suggested that a distinction should be made in RLT analysis between pile type and installation techniques, and for existing analysis techniques, further case studies based on rate correction parameters are required, especially in clay soils.
    Original languageEnglish
    Pages (from-to)1033-1042
    Number of pages10
    JournalSoils and Foundations
    Volume52
    Issue number6
    Publication statusPublished - Dec 2012

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  • Research Output

    • 3 Citations
    • 8 Conference contribution

    Design methods based upon rapid load tests

    Brown, M., Apr 2016, Proceedings of the ISSMGE - ETC 3 International Symposium: Design of Piles in Europe: How did Eurocode 7 change daily practice? . Belgium Building Research Institute , p. 97-104 8 p.

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

    Open Access
    File

    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
  • European standard and guideline for rapid load testing on piles

    Hoelscher, P., van Tol, A. F. & Brown, M. J., May 2010, 11th International Conference on Piling and Deep Foundations. Deep Foundations Institute, 8 p.

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

  • Activities

    • 1 Other membership

    British Standards Institute (External organisation)

    Michael John Brown (Chair)

    Mar 2014 → …

    Activity: Membership typesOther membership

    Prizes

    Institution of Civil Engineers Yorkshire Geotechnical Group best paper prize

    Brown, Michael (Recipient), Nov 2000

    Prize: Prize (including medals and awards)

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