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    Relationship between Porosity and the Constitutive Model Parameters of Rockfill Materials

    Source: Journal of Materials in Civil Engineering:;2019:;Volume ( 031 ):;issue: 002
    Author:
    Donghai Liu; Hui Chen
    DOI: 10.1061/(ASCE)MT.1943-5533.0002598
    Publisher: American Society of Civil Engineers
    Abstract: In this study, triaxial tests are performed on rockfill material (weakly weathered fresh tuff) with different porosities in order to obtain the stress–strain curves of the test specimens. The confining pressure and porosity are found to affect the rockfill material. The suitability of the Duncan–Chang model is assessed, and it is found that this model is not suitable for analyzing the mechanical behavior of rockfill materials with low porosities subjected to low confining pressures. Two models are proposed to overcome the limitations of the Duncan–Chang model: (1) an exponential–parabolic nonlinear elastic model, and (2) a modified Nanshui double yield surface model. Both of these models fit better with the stress–strain data obtained from experiments. Following this, regression models are developed to predict the parameters of the constitutive models as a function of the porosity of rockfill materials with high accuracy, which will enable researchers to obtain fast and reliable estimates of the parameters. The results can be used to lay the theoretical groundwork for finite-element simulations of rockfill dams, taking into account the differences in the constitutive model parameters due to spatial variability in the compaction quality of rockfill materials.
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      Relationship between Porosity and the Constitutive Model Parameters of Rockfill Materials

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    contributor authorDonghai Liu; Hui Chen
    date accessioned2019-03-10T12:19:45Z
    date available2019-03-10T12:19:45Z
    date issued2019
    identifier other%28ASCE%29MT.1943-5533.0002598.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4255329
    description abstractIn this study, triaxial tests are performed on rockfill material (weakly weathered fresh tuff) with different porosities in order to obtain the stress–strain curves of the test specimens. The confining pressure and porosity are found to affect the rockfill material. The suitability of the Duncan–Chang model is assessed, and it is found that this model is not suitable for analyzing the mechanical behavior of rockfill materials with low porosities subjected to low confining pressures. Two models are proposed to overcome the limitations of the Duncan–Chang model: (1) an exponential–parabolic nonlinear elastic model, and (2) a modified Nanshui double yield surface model. Both of these models fit better with the stress–strain data obtained from experiments. Following this, regression models are developed to predict the parameters of the constitutive models as a function of the porosity of rockfill materials with high accuracy, which will enable researchers to obtain fast and reliable estimates of the parameters. The results can be used to lay the theoretical groundwork for finite-element simulations of rockfill dams, taking into account the differences in the constitutive model parameters due to spatial variability in the compaction quality of rockfill materials.
    publisherAmerican Society of Civil Engineers
    titleRelationship between Porosity and the Constitutive Model Parameters of Rockfill Materials
    typeJournal Paper
    journal volume31
    journal issue2
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0002598
    page04018384
    treeJournal of Materials in Civil Engineering:;2019:;Volume ( 031 ):;issue: 002
    contenttypeFulltext
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