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    Volume 43, Issue 1 (January 2020)

    Physical Modeling of Stone Columns in Unsaturated Soil Deposits

    (Received 6 November 2017; accepted 4 October 2018)

    Published Online: 22 January 2019

    CODEN: GTJODJ

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    Abstract

    This article focuses on evaluating the load–settlement response of circular footings on unsaturated soil layers improved with stone columns using 1-gravity (1-g) physical modeling experiments. The initial (preloading) conditions in the soil layers were varied by compaction to the same dry density but different initial degrees of saturation. An effective stress analysis calibrated using direct shear experiments was found to satisfactorily predict the measured bearing capacities of unimproved soil layers, considering a change in failure mode for soil specimens at certain initial degrees of saturation. As the bearing capacity of the unsaturated soil layers increased, the amount of improvement gained by incorporating stone columns decreased. Bulging deformations of the stone column exhibited a close relationship with the bearing capacity, with smaller amounts of bulging in soil layers with low initial degrees of saturation that also have high bearing capacity. The stress concentration ratio increases with increasing initial degree of saturation, indicating that stone columns carry a greater fraction of the applied footing stress for soil layers closer to saturated conditions.

    Author Information:

    Maghvan, Sajjad Vaseghi
    Amirkabir University of Technology, Department of Civil and Environmental Engineering, Tehran,

    Imam, Reza
    Amirkabir University of Technology, Department of Civil and Environmental Engineering, Tehran,

    McCartney, John S.
    Department of Structural Engineering, University of California San Diego, La Jolla, CA


    Stock #: GTJ20170405

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170405

    Author
    Title Physical Modeling of Stone Columns in Unsaturated Soil Deposits
    Symposium ,
    Committee D18