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Microscopic Insights on the Impact of Fabric Anisotropy on Shear Strength of Consolidated Clays
The overall goal of this study is to reveal the microscopic phenomena governing fabric impacts on the shear strength and stiffness of clays using two-dimensional (2D) discrete element models (DEM). Experimental evidence suggests that clay fabric (i.e., the arrangements of particles and void spaces) impacts the clay shear strength. Under a given effective stress, normally consolidated clays with dispersed fabric have higher shear strengths and stiffnesses than those with flocculated fabrics. The 2D DEM models reported here consider the short- and long-range interparticle forces between clay particles that are modeled as rigid rods with a uniform thickness but different sizes. The model was first validated against a laboratory test on a kaolinite clay. Once validated, a series of numerical models were performed to determine the effect of the specimen fabric on the strength and stiffness. The degree of fabric anisotropy was inferred using the distribution of particle orientations. An assessment of the clay microstructure suggested that a stronger Van der Waals attraction exists in dispersed fabrics, possibly being responsible for the higher strength and stiffness of these dispersed fabrics.
Microscopic Insights on the Impact of Fabric Anisotropy on Shear Strength of Consolidated Clays
The overall goal of this study is to reveal the microscopic phenomena governing fabric impacts on the shear strength and stiffness of clays using two-dimensional (2D) discrete element models (DEM). Experimental evidence suggests that clay fabric (i.e., the arrangements of particles and void spaces) impacts the clay shear strength. Under a given effective stress, normally consolidated clays with dispersed fabric have higher shear strengths and stiffnesses than those with flocculated fabrics. The 2D DEM models reported here consider the short- and long-range interparticle forces between clay particles that are modeled as rigid rods with a uniform thickness but different sizes. The model was first validated against a laboratory test on a kaolinite clay. Once validated, a series of numerical models were performed to determine the effect of the specimen fabric on the strength and stiffness. The degree of fabric anisotropy was inferred using the distribution of particle orientations. An assessment of the clay microstructure suggested that a stronger Van der Waals attraction exists in dispersed fabrics, possibly being responsible for the higher strength and stiffness of these dispersed fabrics.
Microscopic Insights on the Impact of Fabric Anisotropy on Shear Strength of Consolidated Clays
Jaradat, Karam A. (author) / Abdelaziz, Sherif L. (author)
International Foundations Congress and Equipment Expo 2021 ; 2021 ; Dallas, Texas
IFCEE 2021 ; 196-204
2021-05-06
Conference paper
Electronic Resource
English
Microscopic Insights on the Impact of Fabric Anisotropy on Shear Strength of Consolidated Clays
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