Open AccessA finite element method based on modified Alonso unsaturated soil constitutive model
Author(s) -
Zecheng Chi,
Zhaowei Meng,
Linyu Xie,
Wei Wang,
Weipeng Zhang
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 - 10.1088/1755-1315/692/4/042034
Subject(s) - suction , yield (engineering) , geotechnical engineering , subroutine , finite element method , constitutive equation , nonlinear system , point (geometry) , flow (mathematics) , overburden pressure , mathematics , stress (linguistics) , shear stress , mechanics , materials science , geology , engineering , structural engineering , computer science , geometry , physics , composite material , mechanical engineering , linguistics , philosophy , quantum mechanics , operating system
Based on the revised ALONSO model, combined with the ABAQUS software platform, this paper compiled the USDFLD subroutine and obtained the stress-strain curve and the axial strain-volume deformation by simulating the triaxial shear test of the unsaturated soil to control the suction and confining pressure. The curve verifies the accuracy and reliability of the algorithm. The research results show that: (1) When the suction is the same, the higher the confining pressure is, the higher the yield point of the soil sample is. According to the comparison between experiment and simulation, the modified Alonso model can reflect the nonlinearity of the stress-strain relationship of the reshaped unsaturated soil sample and its plastic flow characteristics; (2) Compared with saturated soil, unsaturated soil has a higher yield point as a result of the suction. And the larger the suction is, the higher the yield point is, which proves that the model can simulate the influence of unsaturated soil liquid relative to the solid phase.