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A bounding surface plasticity model for expanded polystyrene-sand mixture
Highlights A bounding surface plasticity model for EPS-sand mixture is presented. A non-associate flow rule is developed to capture the plastic deformation. Special treatment is applied to EPS content-dependent strength parameters. Mechanical responses of EPS-sand mixtures with varying EPS are captured.
Abstract This study presents a bounding surface plasticity model to capture the stress-strain responses of expanded polystyrene (EPS)-sand mixture with various EPS content levels. Based on the mechanical responses in isotropic and triaxial tests, a generalized void ratio concept is applied to the potential deformation characteristics of EPS beads. Subsequently, the void ratio-isotropic stress curve can be expressed in a semi-log space, which shows a three-linear-segments manner corresponding to three typical mechanisms (elastic compression, normal compression and sand particle embedding in EPS beads). The plasticity model is formulated within the framework of critical state concept. For the sake of simplicity, the raindrop shaped yield function has been applied to describe the bounding surface, with a non-associate flow rule being adopted to capture the plastic deformation. Thus, this model requires fewer model parameters, most of which can be calibrated through conventional isotropic and triaxial test. By considering the weakening effect caused by including EPS, special treatment has been applied to EPS proportion dependent parameters. The capability of the proposed model has been demonstrated through a model simulation on EPS-sand mixtures with different EPS proportions and various confining pressures.
A bounding surface plasticity model for expanded polystyrene-sand mixture
Highlights A bounding surface plasticity model for EPS-sand mixture is presented. A non-associate flow rule is developed to capture the plastic deformation. Special treatment is applied to EPS content-dependent strength parameters. Mechanical responses of EPS-sand mixtures with varying EPS are captured.
Abstract This study presents a bounding surface plasticity model to capture the stress-strain responses of expanded polystyrene (EPS)-sand mixture with various EPS content levels. Based on the mechanical responses in isotropic and triaxial tests, a generalized void ratio concept is applied to the potential deformation characteristics of EPS beads. Subsequently, the void ratio-isotropic stress curve can be expressed in a semi-log space, which shows a three-linear-segments manner corresponding to three typical mechanisms (elastic compression, normal compression and sand particle embedding in EPS beads). The plasticity model is formulated within the framework of critical state concept. For the sake of simplicity, the raindrop shaped yield function has been applied to describe the bounding surface, with a non-associate flow rule being adopted to capture the plastic deformation. Thus, this model requires fewer model parameters, most of which can be calibrated through conventional isotropic and triaxial test. By considering the weakening effect caused by including EPS, special treatment has been applied to EPS proportion dependent parameters. The capability of the proposed model has been demonstrated through a model simulation on EPS-sand mixtures with different EPS proportions and various confining pressures.
A bounding surface plasticity model for expanded polystyrene-sand mixture
Ma, Jianjun (author) / Chen, Junjie (author) / Chen, Wanxiang (author) / Liu, Chao (author) / Chen, Wei (author)
2021-12-03
Article (Journal)
Electronic Resource
English
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