Research Article
May 1981
The Steady State of Deformation
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VIEW THE REPLYPublication: Journal of the Geotechnical Engineering Division
Volume 107, Issue 5
Abstract
The steady state of deformation for any mass of particles is that state in which the mass is continuously deforming at constant volume, constant normal effective stress, constant shear stress, and constant velocity. The steady state of deformation is achieved only after all particle orientation has reached a statistically steady-state condition and after all particle breakage, if any, is complete, so that the shear stress needed to continue deformation and the velocity of deformation remain constant. The similarities and differences between steady-state deformation and the current use of the term critical state are described. A special undrained triaxial test on a sand is presented to demonstrate clearly that a special flow structure exists during steady-state deformation, which is quite different from the initial structure, and which is credited to a nonrandom, i.e., statistically oriented, arrangement of the sand grains.
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Published In
Journal of the Geotechnical Engineering Division
Volume 107 • Issue 5 • May 1981
Pages: 553 - 562
Copyright
© 1981 American Society of Civil Engineers.
History
Published in print: May 1981
Published online: Feb 11, 2021
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Authors
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Steve J. Poulos, M.ASCE
Principal, Geotechnical Engrs. Inc., 1017 Main St., Winchester, Mass. 01890
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