Stress-Strain Properties of Compacted Clays

by David E. Daniel, (A.M.ASCE), Staff Engr.; Woodward-Lundgren & Assocs., Oakland, CA,
Roy E. Olson, (F.ASCE), Prof. of Civ. Engrg.; Univ. of Texas, Austin, TX,

Serial Information: Journal of the Geotechnical Engineering Division, 1974, Vol. 100, Issue 10, Pg. 1123-1136

Document Type: Journal Paper


The increasing use of finite element techniques for deformation analyses of embankments has resulted in a need for a more quantitative description of the stress-strain behavior of such soils. Data from more than 200 triaxial tests on samples of compacted clay, loaded under unconsolidated-undrained conditions, are analyzed using the hyperbola originated by Kondner. The stress-strain curves are expressed in terms of the initial tangent modulus and strength, both of which are then related to confining pressure. Poisson's ratio was related to stress level (σ1 - σ3)/(σ1 - σ3)f, and then to confining pressure. The resulting general analytic expression was a good representation of the stress-strain curves in about 80% of the tests. The best correlations were found for specimens compacted in the range of water content typically encountered in the field.

Subject Headings: Soil analysis | Stress strain relations | Compacted soils | Clays | Soil stress | Finite element method | Soil deformation | Stress analysis

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