The response of soil in many geotechnical situations, such as earthquake, approximates to the plane strain condition. To simulate this condition, the cyclic behavior of dense and loose sand was studied. The present research reviews the experimental results from plane strain biaxial tests on sand under drained cyclic conditions. Cycles of unloading and reloading show significant hysteresis indicating plastic response. The plastic strain during successive cycles tends to reduce with an increasing number of cycles. It is shown that the sand eventually attains a form of repeating state during which both stress and strain repeat.

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