Ambient pressure calibration for cone penetrometer test: Necessary?

    Research output: Chapter in Book/Conference paperConference paper

    Abstract

    The cone tip load cell needs to be calibrated before the cone penetration test (CPT) data in soil can be used to interpret the soil properties. The cone tip load cell is routinely calibrated through cone tip axial loading test. In this study, the CPTs were conducted in fully saturated layered clay deposits in a centrifuge. The net cone resistance was found to be negative by using the calibration factor obtained through axial loading test. This is illogical. Further CPT calibration was performed in water in the centrifuge under 150 times earth gravity. The CPT calibration factor under ambient pressure in water was found to be different from that obtained through axial loading test. By using both calibration factors from axial load test and under ambient pressure, the net cone resistance was recalculated. The interpreted soil undrained shear strength using the recalculated net cone resistance was consistent with that from a parallel ball penetrometer test. Since the soil overburden pressure acts on the cone tip as an ambient pressure, the cone tip load cell should be calibrated under ambient pressure to provide logical interpretation of CPT data.

    Original languageEnglish
    Title of host publicationPhysical Modelling in Geotechnics
    EditorsAndrew McNamara, Sam Divall, Richard Goodey, Neil Taylor, Sarah Stallebrass, Jignasha Panchal
    Place of PublicationUK
    PublisherCRC Press/Balkema
    Chapter44
    Pages329-334
    Number of pages6
    Volume1
    ISBN (Print)9781138559752
    DOIs
    Publication statusPublished - 1 Jan 2018
    Event9th International Conference on Physical Modelling in Geotechnics, ICPMG 2018 - London, United Kingdom
    Duration: 17 Jul 201820 Jul 2018
    Conference number: 9

    Conference

    Conference9th International Conference on Physical Modelling in Geotechnics, ICPMG 2018
    Abbreviated titleICPMG 2018
    CountryUnited Kingdom
    CityLondon
    Period17/07/1820/07/18

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