An experimental study of the K0 of a loose reconstituted sand is presented. The experimental technique consists of drained vertical compression of a triaxial specimen using the strain path control, in which a positive control of the strain increments rather than the conventional stress increments is exercised. The method does not require the use of any lateral strain sensors as used in previous studies and is free from any side friction affects, typical of oedometer testing. Possible influence of stress/strain history the soil inevitably experiences during sampling or reconstitution together with the initial state of stress prior to initiating zero lateral strain loading on the measured K0 are critically reviewed and evaluated experimentally. It is also shown that the requirement of absolute zero lateral strain may not be essential for obtaining credible estimates of K0 as long as the ratio of radial to axial strain during vertical compression does not exceed about 3 to 5%.
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