Rate dependent behaviour of unsaturated soil with different overconsolidation ratios and its constitutive modelling

Wu, S 2018, Rate dependent behaviour of unsaturated soil with different overconsolidation ratios and its constitutive modelling, Engineering, RMIT University.


Document type: Thesis
Collection: Theses

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Title Rate dependent behaviour of unsaturated soil with different overconsolidation ratios and its constitutive modelling
Author(s) Wu, S
Year 2018
Abstract This study is to investigate the strain-rate effects on unsaturated silt under different overconsolidation ratios (OCRs) and its constitutive modelling. A series of unsaturated triaxial tests under different strain rates are conducted with specimens prepared either isotropically normal consolidated or overconsolidated. The investigation focuses on the strain-rate effects and the influence of overconsolidation ratios on unsaturated silt. The experimental results and discussions include strain rate and OCR effects on the shear strength, pore water pressure, degree of saturation, and volume change during unsaturated triaxial tests. Furthermore, a new elastic visco-plastic (EVP) model is proposed for predicting the strain-rate effects on unsaturated silt. The formulation of the new EVP model is derived using the time-related, suction-related, and OCR-related function for unsaturated soils, and it is validated with the conducted experimental data. Lastly, the EVP model is applied to predict unsaturated triaxial and soil water retention tests either conducted in this research or from literatures. The results indicate that the proposed model gives a better explanation of the strain-rate effects on unsaturated soils with different OCRs.
Institution RMIT University
School, Department or Centre Engineering
Subjects Civil Geotechnical Engineering
Keyword(s) unsaturated
hydro-mechanical behaviour
triaxial
OCR
rate dependent
viscoplastic
constitutive model
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Created: Tue, 05 Feb 2019, 15:21:58 EST by Keely Chapman
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