Open AccessFractional plasticity with anisotropic yielding
Author(s) -
Wei Lu
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/621/1/012179
Subject(s) - anisotropy , dilatant , plasticity , constitutive equation , materials science , geotechnical engineering , granular material , stress (linguistics) , mechanics , geology , physics , composite material , thermodynamics , finite element method , optics , linguistics , philosophy
Granular soil in the field may have an extent of anisotropy, due to natural sedimentation process. To capture the anisotropic constitutive behaviour of such granular soil, an anisotropic fractional-order plasticity approach based on an anisotropic yielding surface is developed in this study. By calculating the stress gradient on the anisotropic yielding surface, a state-dependent stress-dilatancy relation considering material anisotropy is obtained. Then, several different triaxial test results of anisotropically consolidated granular soil are simulated and compared by the model. It is found that the proposed anisotropic fractional plasticity model can reasonably simulate the stress-strain behaviour of silty sand Merriespruit tailing. However, more effort needs to be carried out to enhance the model for more complicated loading condition.