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    Volume 42, Issue 5 (September 2019)

    Element Nail Pullout Tests for Prediction of Soil Nail Pullout Resistance in Expansive Clays

    (Received 25 November 2017; accepted 22 June 2018)

    Published Online: 2018

    CODEN: GTJODJ

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    Abstract

    The performance of soil nail systems relies primarily on soil-nail interaction, which is especially complex for nails embedded in clay materials. Soil-nail interaction is difficult to predict in these soils because of the effect of moisture-induced stress and swelling along the interface between soil and nail. As part of this investigation, tests were conducted to characterize the soil-nail interface shearing mechanisms using a novel element nail pullout device that involves comparatively short nails embedded in soils under varying degrees of saturation. Additionally, a large-scale pullout test, involving inundation and loading phases, was conducted using soil nails embedded in expansive clays. The soil-nail interface shearing mechanisms identified with the element nail pullout device and the vertical rise measurements of the clay from the inundation test were used within a load transfer theoretical framework aimed at predicting the response of soil nails in expansive clays. This load transfer framework provided a very good prediction of the large-scale pullout test results using the data collected from the element nail pullout tests.

    Author Information:

    Chen, Changfu
    College of Civil Engineering, Hunan University, Changsha, Hunan

    Zhang, Genbao
    College of Civil Engineering, Hunan University, Changsha, Hunan

    Zornberg, Jorge Gabriel
    Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, TX

    Zheng, Xinxiu
    College of Civil Engineering, Hunan University, Changsha, Hunan


    Stock #: GTJ20170431

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170431

    Author
    Title Element Nail Pullout Tests for Prediction of Soil Nail Pullout Resistance in Expansive Clays
    Symposium ,
    Committee D18