Instability and Plastic Flow of Soils. I: Experimental Observations
Publication: Journal of Engineering Mechanics
Volume 116, Issue 11
Abstract
According to Drucker's postulate, materials should become unstable when the second increment of plastic work is negative. A series of conventional triaxial tests on fully saturated and partly saturated specimens is performed to study regions of stable and unstable behavior. Experiments on specimens exhibiting dilation or compression show that, during drained conditions, stress paths directed in the region where Drucker's postulate is violated do not produce unstable behavior. However, for specimens that compress and have degrees of saturation higher than critical, there is a change in drainage conditions causing the stress path to be directed within the region where plastic loading occurred with a negative second increment of work and instability. Previously stated stability conditions for materials with nonassociated flow are analyzed in view of the experimental results on saturated and partly saturated sands.
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Published In
Journal of Engineering Mechanics
Volume 116 • Issue 11 • November 1990
Pages: 2532 - 2550
Copyright
Copyright © 1990 ASCE.
History
Published online: Nov 1, 1990
Published in print: Nov 1990
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