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    Undrained Responses of Anisotropic Granular Material under Rotational Shear by DEM

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2022:;Volume ( 148 ):;issue: 012::page 04022112
    Author:
    Q. X. Wu
    ,
    Z. X. Yang
    DOI: 10.1061/(ASCE)GT.1943-5606.0002913
    Publisher: ASCE
    Abstract: The undrained response of sand under complex loading conditions involving principal stress rotation (PSR) is of particular interest in practical engineering. Although this subject has been studied extensively through laboratory experiments, more in-depth investigations of the microscopic mechanism underlying the macroscale observations under PSR have not been reported adequately. The discrete element method (DEM) plays an important role in the investigation of the elementary behavior of sand subjected to various complex loading conditions. It could enable us to comprehend the evolution of particle-scale quantities. Therefore, an advanced discrete element approach that can apply an arbitrary undrained loading path is implemented in this study. Based on this approach, numerical algorithms that implement undrained rotational shear are elucidated, and undrained pure PSR tests are conducted on anisotropic specimens with varying stress ratios, densities, and intermediate principal stress ratios. The evolution of the fabric anisotropy of specimens under PSR is quantified by a contact normal fabric tensor. The macroscopic mechanical results are found to be consistent with the experimental results. The interplay between fabric evolution with stress and strain increments is examined. The findings provide effective microscopic insights into the anisotropic responses of granular materials under rotational shear.
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      Undrained Responses of Anisotropic Granular Material under Rotational Shear by DEM

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4289194
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    contributor authorQ. X. Wu
    contributor authorZ. X. Yang
    date accessioned2023-04-07T00:31:09Z
    date available2023-04-07T00:31:09Z
    date issued2022/12/01
    identifier other%28ASCE%29GT.1943-5606.0002913.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4289194
    description abstractThe undrained response of sand under complex loading conditions involving principal stress rotation (PSR) is of particular interest in practical engineering. Although this subject has been studied extensively through laboratory experiments, more in-depth investigations of the microscopic mechanism underlying the macroscale observations under PSR have not been reported adequately. The discrete element method (DEM) plays an important role in the investigation of the elementary behavior of sand subjected to various complex loading conditions. It could enable us to comprehend the evolution of particle-scale quantities. Therefore, an advanced discrete element approach that can apply an arbitrary undrained loading path is implemented in this study. Based on this approach, numerical algorithms that implement undrained rotational shear are elucidated, and undrained pure PSR tests are conducted on anisotropic specimens with varying stress ratios, densities, and intermediate principal stress ratios. The evolution of the fabric anisotropy of specimens under PSR is quantified by a contact normal fabric tensor. The macroscopic mechanical results are found to be consistent with the experimental results. The interplay between fabric evolution with stress and strain increments is examined. The findings provide effective microscopic insights into the anisotropic responses of granular materials under rotational shear.
    publisherASCE
    titleUndrained Responses of Anisotropic Granular Material under Rotational Shear by DEM
    typeJournal Article
    journal volume148
    journal issue12
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)GT.1943-5606.0002913
    journal fristpage04022112
    journal lastpage04022112_15
    page15
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2022:;Volume ( 148 ):;issue: 012
    contenttypeFulltext
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