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Some Characteristics of the Soil Deformation Process
Author(s) -
McMurdie John L.
Publication year - 1963
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1963.03615995002700030012x
Subject(s) - viscoelasticity , plasticity , deformation (meteorology) , elasticity (physics) , creep , poisson's ratio , geotechnical engineering , mathematics , soil water , nonlinear system , materials science , mechanics , poisson distribution , geology , physics , composite material , soil science , statistics , quantum mechanics
Abstract Existing deformation theories—infinitesimal and finite deformation elasticity theory, plasticity theory, and linear viscoelasticity—were discussed as to their applicability to soils. Analysis of data obtained on a Yolo loam utilizing triaxial compression equipment showed that deformation is nonlinear, finite, irreversible, that the component ratios such as Young's modulus and Poisson's ratio were not constants during the deformation process, and therefore elasticity theory is not generally applicable. Plasticity theory was found to be unsatisfactory as as general theory because of its assumption of a region of Hookean behavior or of yield after only small deformations, neither of which condition holds for soils. Performance of creep tests showed that the basic assumption of viscoelasticity theory, the time‐dependence of the relationship between stress and strain states, is valid for soils. It is concluded that viscoelasticity offers the best hope for a deformation theory for soils.