Open AccessResearch on Constitutive Model of Unsaturated Sand
Author(s) -
Weihua Zhang,
Cheng Zhao,
Yanhua Gao,
Cheng Zhao
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1654/1/012120
Subject(s) - dilatant , geotechnical engineering , shearing (physics) , triaxial shear test , stress space , constitutive equation , mechanics , pore water pressure , overburden pressure , saturation (graph theory) , materials science , phase transition , geology , mathematics , thermodynamics , physics , shear (geology) , composite material , finite element method , combinatorics
For unsaturated sand, due to the existence of suction, under low confining pressure, it has a large volume change during shearing and obvious dilatancy and peak characteristic points appear in the whole stress-strain behavior. Based on the above situation, the boundary surface constitutive model of unsaturated sand is established in general stress space and triaxial stress space based on phase transition state and hydraulic-mechanical coupling. The model has smooth transition among different saturation state and model parameters are easily calibrated via common triaxial tests and some other simple tests.