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- W2011996710 abstract "The very small strain shear modulus of soil, G 0 , is affected by many factors including soil properties, current stress state, stress history, and matric suction. Very little research has been conducted on anisotropic shear moduli of unsaturated soils. In this study, the effects of wetting–drying and stress ratio on anisotropic shear stiffness of an unsaturated completely decomposed tuff (CDT) at very small strains have been investigated using a modified triaxial testing system equipped with three pairs of bender elements. During drying and wetting tests, the measured very small strain shear moduli increased in a nonlinear fashion, but at a reduced rate as the matric suction increased. Similar to the stress-dependent soil-water characteristic curves (SDSWCCs), there was hysteresis between the drying and wetting curves showing the variations in shear moduli with matric suction. Variation in suction on the specimens under isotropic conditions produced changes in stiffness anisotropy (expressed as G 0(hh) /G 0(hv) ) together with anisotropic strains. In shearing tests at constant suctions, significant stress-induced stiffness anisotropy was observed due to a change in the stress ratio. While shearing at a constant stress ratio, G 0(hh) /G 0(hv) appeared to be constant." @default.
- W2011996710 created "2016-06-24" @default.
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- W2011996710 date "2009-09-01" @default.
- W2011996710 modified "2023-10-14" @default.
- W2011996710 title "Effects of wetting–drying and stress ratio on anisotropic stiffness of an unsaturated soil at very small strains" @default.
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- W2011996710 doi "https://doi.org/10.1139/t09-043" @default.
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