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Relation between void ratio and contact fabric of granular soils
https://orcid.org/http://orcid.org/0000-0002-1505-6678
Void ratio is one of the key engineering properties of granular soils. It reflects how well the grains are packed and hints whether the soil is contractive or dilative upon shearing. On the other hand, fabric tensor has been at the centre of experimental and theoretical granular mechanics research over the past decade for its intimate relation with the material’s anisotropy and critical-state behaviour. This paper tests the hypothesis that the void ratio and the fabric tensor of granular soils are tightly correlated to each other. Through discrete element method, a series of isotropic/anisotropic consolidation tests and monotonic triaxial compression and extension tests are conducted. The obtained void ratio data are found to collapse onto one unique surface, namely the fabric–void ratio surface (FVS), when plotted against the first two invariants of the contact-based fabric tensor. The robustness of this relation is confirmed by testing samples with different initial void ratios under various consolidation and monotonic triaxial stress paths. An additional undrained cyclic triaxial test followed by continuous shearing to critical state is performed to further examine the fabric–void ratio relation under complex loading paths. It is found that the previously identified FVS from monotonic tests still attracts the states of these specimens at critical state, although their fabric–void ratio paths deviate from the FVS during cyclic loading. The newly discovered FVS provides a refreshing perspective to interpret the structural evolution of granular materials during shearing and can serve as an important modelling component for fabric-based constitutive theories for sand.
Relation between void ratio and contact fabric of granular soils
https://orcid.org/http://orcid.org/0000-0002-1505-6678
Void ratio is one of the key engineering properties of granular soils. It reflects how well the grains are packed and hints whether the soil is contractive or dilative upon shearing. On the other hand, fabric tensor has been at the centre of experimental and theoretical granular mechanics research over the past decade for its intimate relation with the material’s anisotropy and critical-state behaviour. This paper tests the hypothesis that the void ratio and the fabric tensor of granular soils are tightly correlated to each other. Through discrete element method, a series of isotropic/anisotropic consolidation tests and monotonic triaxial compression and extension tests are conducted. The obtained void ratio data are found to collapse onto one unique surface, namely the fabric–void ratio surface (FVS), when plotted against the first two invariants of the contact-based fabric tensor. The robustness of this relation is confirmed by testing samples with different initial void ratios under various consolidation and monotonic triaxial stress paths. An additional undrained cyclic triaxial test followed by continuous shearing to critical state is performed to further examine the fabric–void ratio relation under complex loading paths. It is found that the previously identified FVS from monotonic tests still attracts the states of these specimens at critical state, although their fabric–void ratio paths deviate from the FVS during cyclic loading. The newly discovered FVS provides a refreshing perspective to interpret the structural evolution of granular materials during shearing and can serve as an important modelling component for fabric-based constitutive theories for sand.
Relation between void ratio and contact fabric of granular soils
https://orcid.org/http://orcid.org/0000-0002-1505-6678
Void ratio is one of the key engineering properties of granular soils. It reflects how well the grains are packed and hints whether the soil is contractive or dilative upon shearing. On the other hand, fabric tensor has been at the centre of experimental and theoretical granular mechanics research over the past decade for its intimate relation with the material’s anisotropy and critical-state behaviour. This paper tests the hypothesis that the void ratio and the fabric tensor of granular soils are tightly correlated to each other. Through discrete element method, a series of isotropic/anisotropic consolidation tests and monotonic triaxial compression and extension tests are conducted. The obtained void ratio data are found to collapse onto one unique surface, namely the fabric–void ratio surface (FVS), when plotted against the first two invariants of the contact-based fabric tensor. The robustness of this relation is confirmed by testing samples with different initial void ratios under various consolidation and monotonic triaxial stress paths. An additional undrained cyclic triaxial test followed by continuous shearing to critical state is performed to further examine the fabric–void ratio relation under complex loading paths. It is found that the previously identified FVS from monotonic tests still attracts the states of these specimens at critical state, although their fabric–void ratio paths deviate from the FVS during cyclic loading. The newly discovered FVS provides a refreshing perspective to interpret the structural evolution of granular materials during shearing and can serve as an important modelling component for fabric-based constitutive theories for sand.
Relation between void ratio and contact fabric of granular soils
Acta Geotech.
Wen, Yuxuan (author) / Zhang, Yida (author)
Acta Geotechnica ; 17 ; 4297-4312
2022-10-01
16 pages
Article (Journal)
Electronic Resource
English
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