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Characterization of Small-Strain Shear Modulus of Sands Subjected to Anisotropic States of Stress
Small strain shear modulus (Gmax) is an important parameter used in geotechnical earthquake engineering. While most of the previous studies on Gmax of sands have focused on isotropic stress state, there exist innumerable situations in geotechnical engineering where the soil is experiencing stress anisotropy. In this study, the influence of stress anisotropy on Gmax of sands is evaluated using the results of a comprehensive set of bender element tests conducted on saturated sand samples under anisotropic loading conditions. It is generally shown that at a given mean effective stress, Gmax increases with stress anisotropy. It is also observed that the influence of stress anisotropy on small-strain shear modulus is more pronounced for well-graded angular sands. This is attributed to the higher structural stability and non-homogeneous distribution of contact forces among the sand particles due to shearing. Finally, a new model for the prediction of small-strain shear modulus of sands subjected to stress anisotropy is developed.
Characterization of Small-Strain Shear Modulus of Sands Subjected to Anisotropic States of Stress
Small strain shear modulus (Gmax) is an important parameter used in geotechnical earthquake engineering. While most of the previous studies on Gmax of sands have focused on isotropic stress state, there exist innumerable situations in geotechnical engineering where the soil is experiencing stress anisotropy. In this study, the influence of stress anisotropy on Gmax of sands is evaluated using the results of a comprehensive set of bender element tests conducted on saturated sand samples under anisotropic loading conditions. It is generally shown that at a given mean effective stress, Gmax increases with stress anisotropy. It is also observed that the influence of stress anisotropy on small-strain shear modulus is more pronounced for well-graded angular sands. This is attributed to the higher structural stability and non-homogeneous distribution of contact forces among the sand particles due to shearing. Finally, a new model for the prediction of small-strain shear modulus of sands subjected to stress anisotropy is developed.
Characterization of Small-Strain Shear Modulus of Sands Subjected to Anisotropic States of Stress
Payan, Meghdad (author) / Senetakis, Kostas (author) / Khoshghalb, Arman (author) / Khalili, Nasser (author)
Sixth Biot Conference on Poromechanics ; 2017 ; Paris, France
Poromechanics VI ; 913-920
2017-07-06
Conference paper
Electronic Resource
English
Small strain shear modulus of anisotropically loaded sands
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