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    Simulation of the Behavior of Structured Clay Using Nonassociated Constitutive Model with and without Anisotropic Fabric at Critical State

    Source: Journal of Engineering Mechanics:;2023:;Volume ( 149 ):;issue: 003::page 04022115-1
    Author:
    Ali Shirmohammadi
    ,
    Masoud Hajialilue-Bonab
    DOI: 10.1061/JENMDT.EMENG-6769
    Publisher: American Society of Civil Engineers
    Abstract: In this paper, a modified/extended rotational hardening (RH) rule is applied to the nonassociated simple anisotropic constitutive model, SANICLAY-D, for clayey soils. In the proposed model, the destructuration mechanism, as well as zero and nonzero fabric anisotropy at critical state (CS), are considered. A detailed model formulation with the RH rule that yields a unique CS in the e-ln(p′) space is presented including an appropriate form of the relatively simple substepping integration algorithm. In addition, the model is implemented into ABAQUS finite-element software using a User-defined Material (UMAT) subroutine and used in the simulation of various experimental tests. The modified SANICLAY-D model (SANICLAY-MD) is meticulously calibrated step by step for Saint-Alban sensitive soft clay. Drained and undrained triaxial tests after various consolidation paths as well as the direct simple shear (DSS) test are simulated for Saint-Alban and Bothkennar clays as a boundary value problem. Simulation results approve the SANICLAY-MD model’s performance in the prediction of the natural soil behavior. Results show that neglecting the effect of fabric anisotropy at CS and destructuration of natural clays can lead to inaccurate prediction in the constitutive modeling of intact soft soils.
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      Simulation of the Behavior of Structured Clay Using Nonassociated Constitutive Model with and without Anisotropic Fabric at Critical State

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4292625
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    contributor authorAli Shirmohammadi
    contributor authorMasoud Hajialilue-Bonab
    date accessioned2023-08-16T19:00:57Z
    date available2023-08-16T19:00:57Z
    date issued2023/03/01
    identifier otherJENMDT.EMENG-6769.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4292625
    description abstractIn this paper, a modified/extended rotational hardening (RH) rule is applied to the nonassociated simple anisotropic constitutive model, SANICLAY-D, for clayey soils. In the proposed model, the destructuration mechanism, as well as zero and nonzero fabric anisotropy at critical state (CS), are considered. A detailed model formulation with the RH rule that yields a unique CS in the e-ln(p′) space is presented including an appropriate form of the relatively simple substepping integration algorithm. In addition, the model is implemented into ABAQUS finite-element software using a User-defined Material (UMAT) subroutine and used in the simulation of various experimental tests. The modified SANICLAY-D model (SANICLAY-MD) is meticulously calibrated step by step for Saint-Alban sensitive soft clay. Drained and undrained triaxial tests after various consolidation paths as well as the direct simple shear (DSS) test are simulated for Saint-Alban and Bothkennar clays as a boundary value problem. Simulation results approve the SANICLAY-MD model’s performance in the prediction of the natural soil behavior. Results show that neglecting the effect of fabric anisotropy at CS and destructuration of natural clays can lead to inaccurate prediction in the constitutive modeling of intact soft soils.
    publisherAmerican Society of Civil Engineers
    titleSimulation of the Behavior of Structured Clay Using Nonassociated Constitutive Model with and without Anisotropic Fabric at Critical State
    typeJournal Article
    journal volume149
    journal issue3
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/JENMDT.EMENG-6769
    journal fristpage04022115-1
    journal lastpage04022115-14
    page14
    treeJournal of Engineering Mechanics:;2023:;Volume ( 149 ):;issue: 003
    contenttypeFulltext
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