In-Situ Strength Characteristics of Soft Clays

by I. Noorany,
H. Bolton Seed,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1965, Vol. 91, Issue 2, Pg. 49-80

Document Type: Journal Paper


The change in effective stress condition resulting from sampling of saturated clays is examined. A link, in terms of Hvorslev strength parameters, ce and ∖a/e, is established between the perfectly undisturbed sample strength and the in-situ strength. The theoretical analysis and the supporting experimental data indicate that for normally consolidated saturated sensitive clays, the in-situ strength and pore-pressure coefficient, Af, are significantly different from those measured on even perfectly undisturbed samples in unconsolidated-undrained triaxial compression tests. An expression is proposed for the evaluation of the in-situ strength of normally consolidated saturated clays in terms of the soil strength parameters, ce and ∖a/e, and the pore-water pressure coefficient, Af, in-situ.

Subject Headings: Saturated soils | Consolidated soils | Soil strength | Soil pressure | Soil analysis | Field tests | Clays | Soft soils

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