Stress-fractional soil model with reduced elastic region

Elsevier BV
Publication Type:
Journal Article
Soils and Foundations, 2019, 59, (6), pp. 2007-2023
Issue Date:
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1-s2.0-S0038080619301854-main.pdfPublished version4.74 MB
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© 2019 The original stress-fractional plasticity approach was developed for the axisymmetric stress state. However, it cannot accurately capture the stress-strain behaviour, e.g., quasi-steady state flow, temporary stress peak and state-dependent dilatancy of soils under different loading conditions. In this study, a modified fractional-order plasticity model for soils under the general stress state is developed using an alternative yielding surface with a reduced elastic region at the dry side of the critical state line. The proposed model is then validated against the results of a series of drained and undrained tests conducted on different soils, including sand, rockfill, ballast and clay, subjected to different loading paths. It is observed that the proposed model can reasonably simulate the key features, such as the hardening/softening, contraction/dilation, liquefaction, quasi-steady state flow and steady state flow behaviour, of different soils.
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