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Yielding of sensitive clays: micromechanical considerations

Prasad, K Nagendra and Murthy, BR Srinivasa and Vatsala, A and Sitharam, TG (1998) Yielding of sensitive clays: micromechanical considerations. In: Canadian Geotechnical Journal, 35 (01). pp. 169-174.

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Test results reported on several natural sensitive soils show significant anisotropy of the yield curves, which are generally oriented along the coefficient of earth pressure at rest (K-0) axis. An attempt is made in this paper to explain the anisotropy in yielding from microstructural considerations. An elliptic pore, with particle domains aligned along the periphery of the pore, and with the major axis of the pore being oriented along the direction of the in situ major principal stress, is chosen as the unit of microstructure. An analysis of forces at the interdomain contacts around the ellipse is carried out with reference to experimentally determined yield stress conditions of one soil, and a yield criteria is defined. The analysis, with the proposed yield criteria, enables one to define the complete yield curve for any other soil from the results of only two tests (one constant eta compression test with eta close to eta(K?0), where eta is the stress ratio (= q/p) and eta(K?0) is the stress ratio corresponding to anisotropic K-0 compression, and another undrained shear test). Predicted yield curves are compared with experimental yield curves of several soils reported in the literature.

Item Type: Journal Article
Publication: Canadian Geotechnical Journal
Publisher: NRC Canada
Additional Information: Copyright of this article belongs to NRC Canada.
Keywords: sensitive clays;yield criteria;anisotropy;microstructure.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 23 Mar 2009 05:08
Last Modified: 19 Sep 2010 05:28
URI: http://eprints.iisc.ac.in/id/eprint/19448

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