A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
nbsp;When undrained triaxial tests are performed, two main phenomena occur.First, the compression of the sample produces an increase in the degree of saturationand therefore, a reduction in the value of suction. Second, with the reduction in thesizes of pores, the retention curves shift on the axis of suction. Thereafter, thesimulation of undrained triaxial tests requires the correct simulation of thehydromechanical coupling phenomenon. A fully coupled constitutive model forunsaturated soils is used herein to simulate the behavior of unsaturated soils subjectedto undrained conditions. The mechanical model is based on the modified Critical Statemodel and the effective stress concept. The hydraulic model uses the grain and poresize distributions to approximately reproduce the structure of soils. This model is ableto simulate the soil-water retention curves during wetting-drying cycles. Plasticvolumetric strains modify the pore size distribution of the soil, which in turn affectsthe retention curves and, therefore, the current effective stress. Some comparisonsbetween numerical and experimental results of undrained triaxial tests show theadequacy of the model.
nbsp;When undrained triaxial tests are performed, two main phenomena occur.First, the compression of the sample produces an increase in the degree of saturationand therefore, a reduction in the value of suction. Second, with the reduction in thesizes of pores, the retention curves shift on the axis of suction. Thereafter, thesimulation of undrained triaxial tests requires the correct simulation of thehydromechanical coupling phenomenon. A fully coupled constitutive model forunsaturated soils is used herein to simulate the behavior of unsaturated soils subjectedto undrained conditions. The mechanical model is based on the modified Critical Statemodel and the effective stress concept. The hydraulic model uses the grain and poresize distributions to approximately reproduce the structure of soils. This model is ableto simulate the soil-water retention curves during wetting-drying cycles. Plasticvolumetric strains modify the pore size distribution of the soil, which in turn affectsthe retention curves and, therefore, the current effective stress. Some comparisonsbetween numerical and experimental results of undrained triaxial tests show theadequacy of the model.
Undrained Tests
Rojas, Eduardo (author)
2022
Article/Chapter (Book)
Electronic Resource
English
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