Author(s)

L.B. Ibsen

Abstract

The stable state in cyclic loading L.B. Ibsen Soil Mechanics Laboratory, Aalborg University, Denmark ABSTRACT The behaviour of sand during cyclic loading has been studied in the Danish Triaxial Cell (smooth pressure heads and specimens with equal height and diameter) under different anisotropic stress levels. A new characteristic state "The Cyclic Stable State'' has been discovered. The cyclic stable state occurs when the positive and negative pore pressures generated during a loading cycle neutralize each other. The mean normal stress does not change when the stable state has been reached and the cyclic loading will not lead to any further hardening or softening of the soil. If cyclic tests are executed at different anisotropic stress levels the stable states describe a line in the stress space "The Cyclic Stable Line''. If the anisotropic mean stress level is situated below the stable line the cyclic test will try to reach the equilibrium of the stable state. The test will gen

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