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    Effect of Viscoplasticity on Localization in Saturated Clays and Plastic Silts

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2023:;Volume ( 149 ):;issue: 004::page 04023016-1
    Author:
    Tyler J. Oathes
    ,
    Ross W. Boulanger
    DOI: 10.1061/JGGEFK.GTENG-10984
    Publisher: American Society of Civil Engineers
    Abstract: A numerical study is presented of the effects of viscoplasticity on localization processes in sensitive, saturated clays and plastic silts. Numerical simulations of laboratory specimens of sensitive, viscoplastic soil subjected to monotonic, undrained, direct simple shear loading were performed using a viscoplastic constitutive model. Parametric analyses evaluated the effects of soil sensitivity, postpeak strain-softening rate, and strain rate dependency, as well as specimen size, mesh discretization, and loading rate. The numerical results showed that the global strain at which a localization forms primarily depends on the strain rate dependency of the soil’s shearing resistance relative to its rate of postpeak strain softening. A regression model is subsequently presented that relates the global strain at the onset of localization to the soil’s strain rate dependency and postpeak strain-softening rate. The results indicate that the inclusion of reasonable levels of viscoplasticity significantly increases the strain that can develop before a localization develops in clays and plastic silts with modest strain-softening rates. The consistency of the numerical results with available laboratory observations is discussed. Implications for practice and future research needs are discussed.
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      Effect of Viscoplasticity on Localization in Saturated Clays and Plastic Silts

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4292713
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    contributor authorTyler J. Oathes
    contributor authorRoss W. Boulanger
    date accessioned2023-08-16T19:04:25Z
    date available2023-08-16T19:04:25Z
    date issued2023/04/01
    identifier otherJGGEFK.GTENG-10984.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4292713
    description abstractA numerical study is presented of the effects of viscoplasticity on localization processes in sensitive, saturated clays and plastic silts. Numerical simulations of laboratory specimens of sensitive, viscoplastic soil subjected to monotonic, undrained, direct simple shear loading were performed using a viscoplastic constitutive model. Parametric analyses evaluated the effects of soil sensitivity, postpeak strain-softening rate, and strain rate dependency, as well as specimen size, mesh discretization, and loading rate. The numerical results showed that the global strain at which a localization forms primarily depends on the strain rate dependency of the soil’s shearing resistance relative to its rate of postpeak strain softening. A regression model is subsequently presented that relates the global strain at the onset of localization to the soil’s strain rate dependency and postpeak strain-softening rate. The results indicate that the inclusion of reasonable levels of viscoplasticity significantly increases the strain that can develop before a localization develops in clays and plastic silts with modest strain-softening rates. The consistency of the numerical results with available laboratory observations is discussed. Implications for practice and future research needs are discussed.
    publisherAmerican Society of Civil Engineers
    titleEffect of Viscoplasticity on Localization in Saturated Clays and Plastic Silts
    typeJournal Article
    journal volume149
    journal issue4
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/JGGEFK.GTENG-10984
    journal fristpage04023016-1
    journal lastpage04023016-15
    page15
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2023:;Volume ( 149 ):;issue: 004
    contenttypeFulltext
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