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<p>The calibration and validation of elastoplastic soil constitutive models require accurate representation of elastic and plastic strain contributions, as well as the effects of shearing direction. This study investigates these factors through drained and undrained cyclic and monotonic triaxial tests on Toyoura sand using a practical advanced bounding surface constitutive model P2PSand for 3D geotechnical earthquake engineering applications. Results show that while drained triaxial tests can be well-calibrated with different parameter sets, undrained conditions demand a specific parameter combination to properly capture the interplay between elastic and plastic deformations. The study also identifies limitations in simulating diverse shearing modes (triaxial compression, extension, simple shear, and cyclic undrained triaxial tests), which highlight the model inadequate sensitivity to the loading direction. Nevertheless, the model successfully predicts liquefaction in Christchurch sand under cyclic simple shear, confirming its utility for specific scenarios. These findings highlight the necessity of calibration protocols that explicitly address strain partitioning (elastic vs. plastic) and loading path dependency for reliable geotechnical applications. Finally, a model improvement is proposed that maintains both practical applicability and accuracy of the model.</p>

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Roles of Elastic–Plastic Strains and Fabric in Soil Constitutive Models Under Monotonic and Cyclic Loading Paths

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Tarek Mohamed

摘要

The calibration and validation of elastoplastic soil constitutive models require accurate representation of elastic and plastic strain contributions, as well as the effects of shearing direction. This study investigates these factors through drained and undrained cyclic and monotonic triaxial tests on Toyoura sand using a practical advanced bounding surface constitutive model P2PSand for 3D geotechnical earthquake engineering applications. Results show that while drained triaxial tests can be well-calibrated with different parameter sets, undrained conditions demand a specific parameter combination to properly capture the interplay between elastic and plastic deformations. The study also identifies limitations in simulating diverse shearing modes (triaxial compression, extension, simple shear, and cyclic undrained triaxial tests), which highlight the model inadequate sensitivity to the loading direction. Nevertheless, the model successfully predicts liquefaction in Christchurch sand under cyclic simple shear, confirming its utility for specific scenarios. These findings highlight the necessity of calibration protocols that explicitly address strain partitioning (elastic vs. plastic) and loading path dependency for reliable geotechnical applications. Finally, a model improvement is proposed that maintains both practical applicability and accuracy of the model.