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Effects of initial fabric anisotropy on the undrained rotational shear responses of granular material using discrete element simulations
In this study, a convenient and efficient DEM sample preparation procedure capable of generating three-dimensional specimens with various intensities of initial fabric anisotropy is presented. The initial fabric could be altered by varying the bedding plane angle α of the soil deposition relative to the horizontal plane. A full spectrum of α values ranging from − 90 to 90° at an interval of 22.5° was considered. A series of undrained rotational shear (RS) tests with intermediate principal stress ratios b (= 0, 0.5, and 1) were conducted on these initially anisotropic samples using a novel discrete element approach that can apply arbitrary undrained loading paths. The microstructure evolution during the undrained RS was quantified using a contact-normal-based fabric tensor, which describes the load-bearing structure of the specimen. The simulation results indicate that the value of α has a profound effect on the strain evolution patterns of the initially anisotropic samples, which can be explained by their corresponding fabric evolutions. The results obtained from this study may provide new insights into the underlying mechanism of cyclic liquefaction and offer useful guidance for the micromechanics-based constitutive modeling of undrained mechanical behavior under RS.
Effects of initial fabric anisotropy on the undrained rotational shear responses of granular material using discrete element simulations
In this study, a convenient and efficient DEM sample preparation procedure capable of generating three-dimensional specimens with various intensities of initial fabric anisotropy is presented. The initial fabric could be altered by varying the bedding plane angle α of the soil deposition relative to the horizontal plane. A full spectrum of α values ranging from − 90 to 90° at an interval of 22.5° was considered. A series of undrained rotational shear (RS) tests with intermediate principal stress ratios b (= 0, 0.5, and 1) were conducted on these initially anisotropic samples using a novel discrete element approach that can apply arbitrary undrained loading paths. The microstructure evolution during the undrained RS was quantified using a contact-normal-based fabric tensor, which describes the load-bearing structure of the specimen. The simulation results indicate that the value of α has a profound effect on the strain evolution patterns of the initially anisotropic samples, which can be explained by their corresponding fabric evolutions. The results obtained from this study may provide new insights into the underlying mechanism of cyclic liquefaction and offer useful guidance for the micromechanics-based constitutive modeling of undrained mechanical behavior under RS.
Effects of initial fabric anisotropy on the undrained rotational shear responses of granular material using discrete element simulations
Acta Geotech.
Wu, Q. X. (author) / Zheng, J. J. (author) / Yang, Z. X. (author)
Acta Geotechnica ; 18 ; 5175-5194
2023-10-01
20 pages
Article (Journal)
Electronic Resource
English
Bedding plane , Discrete element modeling , Fabric anisotropy , Granular material , Liquefaction resistance , Undrained rotational shear Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
Undrained anisotropy and rotational shear in granular soil
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Undrained anisotropy and rotational shear in granular soil
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Effect of initial fabric anisotropy on undrained cyclic shear characteristics of sand
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