Open AccessThe effect of stress path on the dilatation angle of soils
Author(s) -
Osmo Korhonen,
M. Lojander,
Monica Susanne Löfman,
Mirva Koskinen,
Leena Korkiala-Tanttu
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 - 10.1088/1755-1315/710/1/012043
Subject(s) - stress path , subsoil , geotechnical engineering , silt , stress (linguistics) , soil water , function (biology) , triaxial shear test , geology , mechanics , mathematics , materials science , plasticity , soil science , shear (geology) , physics , composite material , paleontology , linguistics , philosophy , evolutionary biology , biology
Modelling the horizontal displacements in subsoil is essential in many geotechnical design situations. Especially dilatation angle should be correctly defined in order to ensure accurate modelling. Hence, this paper studies how the direction of stress path affects the dilatation angle of various soils. The study utilizes numerous anisotropically consolidated and drained compression triaxial tests, and the samples represent normally consolidated soft clay, stiff over-consolidated silt and dry sand. The plastic potential function is derived based on the triaxial test results, using stress values in which the dilatation angle is identical to the direction of stress path. The shape of potential function is assumed to be similar to the yield function, but with different parameters (non-associated modelling of strains). Finally, deformations are calculated by using the concept of potential energy, which is a second order function in mean effective stress - deviatoric stress-space. Simulated values are then compared to triaxial test measurements, and the agreement between values is found to be rather good.