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Why the OCR may reduce the small strain shear stiffness of granular materials?
Abstract The small strain shear stiffness G 0 of the soil is of interest and importance in both theory and practice. It is expected that for granular materials G 0 would slightly increases with over-consolidation ratio (OCR). However, laboratory tests indicate that G 0 may decrease with increasing OCR, especially for loose specimens, which is counterintuitive. To explore the underlying mechanism, discrete element method (DEM) is used to investigate the effect of OCR on G 0. The DEM simulations successfully capture the laboratory observations. The analyses at the particulate level reveal that the decrease in small strain stiffness is mainly due to the decreases in coordination number and the uniformity of contact force distribution during unloading process.
Why the OCR may reduce the small strain shear stiffness of granular materials?
Abstract The small strain shear stiffness G 0 of the soil is of interest and importance in both theory and practice. It is expected that for granular materials G 0 would slightly increases with over-consolidation ratio (OCR). However, laboratory tests indicate that G 0 may decrease with increasing OCR, especially for loose specimens, which is counterintuitive. To explore the underlying mechanism, discrete element method (DEM) is used to investigate the effect of OCR on G 0. The DEM simulations successfully capture the laboratory observations. The analyses at the particulate level reveal that the decrease in small strain stiffness is mainly due to the decreases in coordination number and the uniformity of contact force distribution during unloading process.
Why the OCR may reduce the small strain shear stiffness of granular materials?
Gu, Xiaoqiang (author) / Yang, Shuocheng (author)
Acta Geotechnica ; 13 ; 1467-1472
2018-07-11
6 pages
Article (Journal)
Electronic Resource
English
Discrete element method , Micromechanics , OCR , Poisson’s ratio , Small strain stiffness Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
Why the OCR may reduce the small strain shear stiffness of granular materials?
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