Three-dimensional stress-strain and strength behavior of silt-clay transition soils

The effect of silt content on the mechanical behavior of silt-clay transition soils under three-dimensional stress conditions is presented. Undrained true triaxial tests with constant b values were performed on normally consolidated specimens of silt-clay transition soils created from the same base clay and non-plastic silt, however, with systematically varying gradations. With increasing amount of non-plastic silt, the cohesive soils exhibit less contractive tendencies, stiffer stress-strain response and larger shear strength. The magnitude of intermediate principal stress, as indicated by the b value, also strongly influences the stress-strain relations, pore pressure behavior and both total and effective failure surfaces. Although the transition soils exhibit overall clay-like behavior, more pronounced frictional characteristics, as indicated by the shapes of the failure and plastic potential surfaces, were exhibited with increasing silt content.
This article was originally published in Canadian Geotechnical Journal. The version of record is available at: © The Author(s) or their Institution(s).
silt-clay soil, stress-strain, shear strength, silt content, true triaxial test
Pongpipat Anantanasakul, Phimmawat Intharachart, and Victor N. Kaliakin. 2023. Three-dimensional stress–strain and strength behavior of silt–clay transition soils. Canadian Geotechnical Journal. e-First