Elastoplastic Stress-Strain Theory for Cohesionless Soil

by Poul V. Lade, (A.M.ASCE), Asst. Prof. of Engrg. and Applied Sci.; Univ. of California, Los Angeles, Calif.,
James M. Duncan, (M.ASCE), Prof. of Civ. Engrg.; Univ. of California, Berkeley, Calif.,


Serial Information: Journal of the Geotechnical Engineering Division, 1975, Vol. 101, Issue 10, Pg. 1037-1053


Document Type: Journal Paper

Discussion: Burley Eldon (See full record)
Discussion: Saada Adel S. (See full record)
Discussion: Pender Michael J. (See full record)
Errata: (See full record)
Discussion: Brown Andre G.P. (See full record)
Closure: (See full record)

Abstract: Based on the results of cubical triaxial tests on Monterey No.0 Sand, an elastoplastic stress-strain theory was developed for cohesionless soil. The theory incorporates a new failure criterion, a new yield criterion, a new flow rule, and an empirical work-hardening law. The theory is applicable to general three-dimensional stress conditions and it models several essential aspects of the soil behavior observed in experimental investigations: nonlinearity, the influence of σ3, the influence of σ2, stress-path dependency, shear dilatancy effects, and coincidence of stress increment and strain increment axes at low stress levels with transition to coincidence of stress and strain increment axes at high stress levels. Results of cubical triaxial tests, torsion shear tests, and tests performed using various stress-paths were analyzed using the theory, and it was found that the stress-strain and strength characteristics observed in these tests were predicted with reasonable accuracy.

Subject Headings: Stress strain relations | Triaxial tests | Shear tests | Cohesionless soils | Soil stress | Shear stress | Triaxial loads | Elastoplasticity

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