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    Volume 40, Issue 6 (November 2017)

    Transiently Loaded Bucket Foundations in Saturated Dense Sand - Demonstration of the Boot Effect

    (Received 19 December 2016; accepted 16 May 2017)

    Published Online: 2017

    CODEN: GTJODJ

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    Abstract

    The mono bucket foundation is a cost-effective foundation for offshore wind turbines. During a storm, these foundations are exposed to large wave loads of short duration. This paper investigates the effect of increased loading rate on the bearing capacity of two mono bucket foundations installed in dense sand inside a pressure tank. The foundations had aspect ratios (skirt lengths [L] relative to the diameters [D]), L/D, of 0.5 and 1.0, respectively. Foundations were brought to failure with varying loading rates, resulting in drained, partly drained, or undrained behavior. Increases in bearing capacity were observed as the loading rate increased. This behavior was caused by a combination of dilative soil behavior and suction created by upward movement, known as the boot effect. For mono bucket foundations, the boot effect resulted in an increased bearing capacity that was 18 to 25 times higher than the drained capacity. Furthermore, the boot effect also led to an increase in stiffness. The stiffness of the partly drained response is measured up to four times higher compared with drained behavior.

    Author Information:

    Nielsen, Søren Dam
    Department of Civil Engineering, Aalborg University, Aalborg Ø,

    Ibsen, Lars Bo
    Department of Civil Engineering, Aalborg University, Aalborg Ø,

    Nielsen, Benjaminn Nordahl
    Department of Civil Engineering, Aalborg University, Aalborg Ø,


    Stock #: GTJ20160339

    ISSN:0149-6115

    DOI: 10.1520/GTJ20160339

    Author
    Title Transiently Loaded Bucket Foundations in Saturated Dense Sand - Demonstration of the Boot Effect
    Symposium ,
    Committee D18