Capillary-based effective stress formulation for predicting shear strength of unsaturated soils

Author:

Konrad Jean-Marie11,Lebeau Marc11

Affiliation:

1. Department of Civil and Water Engineering, Faculty of Sciences and Engineering, Laval University, Adrien-Pouliot Pavilion, 1065, avenue de la Médecine, Quebec City, QC G1V 0A6, Canada.

Abstract

A number of investigations have shown that the shear strength of unsaturated soils can be defined in terms of effective stress. The difficulty in this approach lies in quantifying the effective stress parameter, or Bishop’s parameter. Although often set equal to the degree of saturation, it has recently been suggested that the effective stress parameter should be related to an effective degree of saturation, which defines the fraction of water that contributes to soil strength. A problematic element in this approach resides in differentiating the water that contributes to soil strength from that which does not contribute to soil strength. To address this difficulty, the paper uses theoretical considerations and experimental observations to partition the water retention function into capillary and adsorptive components. Given that the thin liquid films of adsorbed water should not contribute to effective stress, the effective stress parameter is solely related to the capillary component of water retention. In sample calculations, this alternative effective stress parameter provided very good agreement with experimental data of shear strength for a variety of soil types.

Publisher

Canadian Science Publishing

Subject

Civil and Structural Engineering,Geotechnical Engineering and Engineering Geology

Reference50 articles.

1. A constitutive model for partially saturated soils

2. Alonso, E.E., Ortega Iturralde, E.F., and Romero, E.E. 2007. Dilatancy of coarse granular aggregates.InExperimental unsaturated soil mechanics. Vol. 112.Edited byT. Schanz. Springer Berlin Heidelberg, pp. 119–135.

3. A microstructurally based effective stress for unsaturated soils

4. Compacted soil behaviour: initial state, structure and constitutive modelling

5. Bishop, A.W. 1961. The measurement of pore pressure in the triaxial test.InPore pressure and suction in soils. Butterworths, London, pp. 38–46.

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