Analysis of Behaviour of Calcareous Sand under Uniform Cyclic Loading

摘要

The paper describes an analysis of the results of a calcareous sand subjected to repeated axial stresses under drained triaxial test conditions. In considering the permanent or residual strains, the measured strains have been separated into two components; the first component results from initial or virgin loading and the second component is due to repeated loading. Only the strains caused by repeated loading are considered in the paper. It is postulated that the relationship between the rate of accumulation of residual volumetric and shear strains on one hand, and the mean and amplitude of the cyclic shear stresses acting on the soil on the other hand, can both be related to the amplitude of the shear strains that the soil experiences during each stress cycle. Experimental data is provided to support this postulate. An empirical relationship is also presented for determining the amplitude of shear strain based on the mean and amplitude of the deviator stress acting on the soil sample.