Measurement of coefficient of consolidation during reconsolidation of liquefied sand

A.J. Brennan, S. P. G. Madabhushi

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    Saturated sands particularly at low relative density commonly exhibit rises in excess pore pressure when subjected to earthquake loading. The excess pore pressure can approach a maximum value, limited by the initial vertical effective stress. After the completion of earthquake shaking, these excess pore pressures dissipate according to the consolidation equation, which can be solved to produce a Fourier series solution. It will be shown by manipulation of this Fourier series that excess pore pressure traces provide a method for back-calculation of coefficient of consolidation C-v. This method is validated against dissipation curves generated using known values of C-v and seen to be more accurate in the middle of the layer. The method is then applied to data recorded in centrifuge tests to evaluate C-v throughout the reconsolidation process following liquefaction conditions. C-v is seen to fit better as a function of excess pore pressure ratio than effective stress for the stress levels considered. For the soil investigated, C-v is about three times smaller at excess pore pressure ratio of 0.9 compared to excess pore pressure ratio of 0.

    Original languageEnglish
    Pages (from-to)139-146
    Number of pages8
    JournalGeotechnical Testing Journal
    Volume34
    Issue number2
    DOIs
    Publication statusPublished - Mar 2011

    Keywords

    • liquefaction
    • sands
    • centrifuge modeling
    • compressibility
    • consolidation
    • earthquakes
    • LIQUEFACTION
    • MODEL

    Cite this

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    title = "Measurement of coefficient of consolidation during reconsolidation of liquefied sand",
    abstract = "Saturated sands particularly at low relative density commonly exhibit rises in excess pore pressure when subjected to earthquake loading. The excess pore pressure can approach a maximum value, limited by the initial vertical effective stress. After the completion of earthquake shaking, these excess pore pressures dissipate according to the consolidation equation, which can be solved to produce a Fourier series solution. It will be shown by manipulation of this Fourier series that excess pore pressure traces provide a method for back-calculation of coefficient of consolidation C-v. This method is validated against dissipation curves generated using known values of C-v and seen to be more accurate in the middle of the layer. The method is then applied to data recorded in centrifuge tests to evaluate C-v throughout the reconsolidation process following liquefaction conditions. C-v is seen to fit better as a function of excess pore pressure ratio than effective stress for the stress levels considered. For the soil investigated, C-v is about three times smaller at excess pore pressure ratio of 0.9 compared to excess pore pressure ratio of 0.",
    keywords = "liquefaction, sands, centrifuge modeling, compressibility, consolidation, earthquakes, LIQUEFACTION, MODEL",
    author = "A.J. Brennan and Madabhushi, {S. P. G.}",
    year = "2011",
    month = "3",
    doi = "10.1520/GTJ102914",
    language = "English",
    volume = "34",
    pages = "139--146",
    journal = "Geotechnical Testing Journal",
    issn = "0149-6115",
    publisher = "ASTM International",
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    }

    Measurement of coefficient of consolidation during reconsolidation of liquefied sand. / Brennan, A.J.; Madabhushi, S. P. G.

    In: Geotechnical Testing Journal, Vol. 34, No. 2, 03.2011, p. 139-146.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Measurement of coefficient of consolidation during reconsolidation of liquefied sand

    AU - Brennan, A.J.

    AU - Madabhushi, S. P. G.

    PY - 2011/3

    Y1 - 2011/3

    N2 - Saturated sands particularly at low relative density commonly exhibit rises in excess pore pressure when subjected to earthquake loading. The excess pore pressure can approach a maximum value, limited by the initial vertical effective stress. After the completion of earthquake shaking, these excess pore pressures dissipate according to the consolidation equation, which can be solved to produce a Fourier series solution. It will be shown by manipulation of this Fourier series that excess pore pressure traces provide a method for back-calculation of coefficient of consolidation C-v. This method is validated against dissipation curves generated using known values of C-v and seen to be more accurate in the middle of the layer. The method is then applied to data recorded in centrifuge tests to evaluate C-v throughout the reconsolidation process following liquefaction conditions. C-v is seen to fit better as a function of excess pore pressure ratio than effective stress for the stress levels considered. For the soil investigated, C-v is about three times smaller at excess pore pressure ratio of 0.9 compared to excess pore pressure ratio of 0.

    AB - Saturated sands particularly at low relative density commonly exhibit rises in excess pore pressure when subjected to earthquake loading. The excess pore pressure can approach a maximum value, limited by the initial vertical effective stress. After the completion of earthquake shaking, these excess pore pressures dissipate according to the consolidation equation, which can be solved to produce a Fourier series solution. It will be shown by manipulation of this Fourier series that excess pore pressure traces provide a method for back-calculation of coefficient of consolidation C-v. This method is validated against dissipation curves generated using known values of C-v and seen to be more accurate in the middle of the layer. The method is then applied to data recorded in centrifuge tests to evaluate C-v throughout the reconsolidation process following liquefaction conditions. C-v is seen to fit better as a function of excess pore pressure ratio than effective stress for the stress levels considered. For the soil investigated, C-v is about three times smaller at excess pore pressure ratio of 0.9 compared to excess pore pressure ratio of 0.

    KW - liquefaction

    KW - sands

    KW - centrifuge modeling

    KW - compressibility

    KW - consolidation

    KW - earthquakes

    KW - LIQUEFACTION

    KW - MODEL

    U2 - 10.1520/GTJ102914

    DO - 10.1520/GTJ102914

    M3 - Article

    VL - 34

    SP - 139

    EP - 146

    JO - Geotechnical Testing Journal

    JF - Geotechnical Testing Journal

    SN - 0149-6115

    IS - 2

    ER -