Effects of sample disturbance in the determination of soil parameters for advanced finite element modelling of sensitive clays

Marco D’Ignazio, Hans Petter Jostad, Tim Länsivaara, Ville Lehtonen, Juho Mansikkamäki, Christopher Meehan

    Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

    Abstract

    The stress-strain response of sensitive clays tested in a laboratory setting can be significantly affected by disturbance effects caused by sampling, transport, storage and specimen preparation. Soil models for finite element analyses are commonly calibrated using the results from laboratory tests and, consequently, calibrated model parameters are likely to be affected by sample disturbance. For sensitive clays subjected to constant volume shearing, the stress-strain behavior is dependent on the direction of loading and, due to build-up of shear induced pore pressure, effective stresses will reduce with increasing strain in the post-peak regime. According to previous studies, peak strengths, strains at failure and postpeak behavior of sensitive clays are all significantly influenced by sample quality. Therefore, the relative quality of model predictions generated using a sensitive clay finite element model can also be expected to be notably affected by sample disturbance. In this study, the impact of sample disturbance on the determination of model input parameters for advanced finite element modelling of sensitive clays is addressed and critically discussed. Two advanced soil models are used for this purpose: the total stress based NGI-ADPSoft model, which is able to predict the anisotropic strain-softening behavior of saturated sensitive clays, and the effective stress based S-CLAY1S model, which is characterized by an anisotropic yield surface and is able to simulate soil destructuration. The practical implications of a thoughtful selection of the input parameters are evaluated through FE stability analyses of a sensitive clay slope.

    Original languageEnglish
    Title of host publicationLandslides in Sensitive Clays
    Subtitle of host publicationFrom Research to Implementation
    PublisherSpringer
    Pages146-154
    Number of pages9
    ISBN (Electronic)978-3-319-56487-6
    ISBN (Print)978-3-319-56486-9
    DOIs
    Publication statusPublished - 2017
    Publication typeA3 Book chapter

    Publication series

    NameAdvances in Natural and Technological Hazards Research
    Volume46
    ISSN (Print)1878-9897
    ISSN (Electronic)2213-6959

    Publication forum classification

    • Publication forum level 2

    ASJC Scopus subject areas

    • Computers in Earth Sciences
    • Economic Geology
    • Global and Planetary Change
    • Management, Monitoring, Policy and Law
    • Geography, Planning and Development

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