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Performance of Bounding Surface Constitutive Models in Predicting Cyclic Behavior of Low-Plasticity Fine-Grained Soils
A series of cyclic and monotonic constant-height direct simple shear experiments were conducted on a low-plasticity fine-grained soil mixture. The mixture exhibits fundamental behavior that is similar to that of typical clays, but also shows features of sand-like materials, such as high excess pore pressure ratios and developing large strains in a low number of loading cycles. This paper discusses key differences in predictions of two bounding surface constitutive models in simulating the cyclic behavior of the specimens tested in the laboratory. Numerical simulations were performed first, by a model developed for clays, and second, by a model developed for sands. Both models were calibrated using an advanced optimization technique to remove bias introduced by trial and error calibration methods. The comparison of the results of the simulations with laboratory test data shows significant differences and indicates that some fundamental features of the cyclic behavior of low-plasticity fine-grained soils cannot be captured by such models, suggesting it is necessary to develop more robust constitutive models for low-plasticity fine-grained soils.
Performance of Bounding Surface Constitutive Models in Predicting Cyclic Behavior of Low-Plasticity Fine-Grained Soils
A series of cyclic and monotonic constant-height direct simple shear experiments were conducted on a low-plasticity fine-grained soil mixture. The mixture exhibits fundamental behavior that is similar to that of typical clays, but also shows features of sand-like materials, such as high excess pore pressure ratios and developing large strains in a low number of loading cycles. This paper discusses key differences in predictions of two bounding surface constitutive models in simulating the cyclic behavior of the specimens tested in the laboratory. Numerical simulations were performed first, by a model developed for clays, and second, by a model developed for sands. Both models were calibrated using an advanced optimization technique to remove bias introduced by trial and error calibration methods. The comparison of the results of the simulations with laboratory test data shows significant differences and indicates that some fundamental features of the cyclic behavior of low-plasticity fine-grained soils cannot be captured by such models, suggesting it is necessary to develop more robust constitutive models for low-plasticity fine-grained soils.
Performance of Bounding Surface Constitutive Models in Predicting Cyclic Behavior of Low-Plasticity Fine-Grained Soils
Eslami, Mohammad M. (author) / Zarrabi, Mohammad (author) / Yniesta, Samuel (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 57-66
2019-03-21
Conference paper
Electronic Resource
English
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