Open AccessResearch on the yield function of sand based on thermodynamics
Author(s) -
Weihua Zhang,
Cheng Zhao,
Yinping Zhang,
Cheng Zhao,
Yanhua Gao
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/580/1/012098
Subject(s) - dilatant , dissipative system , anisotropy , stress space , consolidation (business) , materials science , phase transition , geotechnical engineering , plane stress , yield surface , cauchy stress tensor , plasticity , shear stress , shear (geology) , mechanics , constitutive equation , thermodynamics , classical mechanics , geology , physics , composite material , optics , accounting , finite element method , business
It is well known that stress-strain relation of sand is influenced by anisotropic fabric. In this paper, the relationship between macroscopic strain and shear strain and its pore structure is established by combining micromechanical theory and pore structure tensor. It is further confirmed that the stress-induced anisotropy and dilatancy of sand are inevitable. Based on this, with the help of thermodynamic theory, the inclined elliptic yield surface function in dissipative space is built, and there are three important lines in dissipative space for the influence of anisotropic fabric, normal consolidation line, phase transition line and peak line respectively corresponding to the three characteristic lines of real stress space: normal consolidation line, phase transition line and peak line which really reflects the mechanical properties of sand, especially dense sand.