Abstract
ABSTRACT By employing different kinds of stress paths drained triaxial compression tests were conducted on sand samples having several densities. In the course of complicated cycles of stress change, the states of stress at which plastic deformations begin to take place were determined. Simple analysis using a number of plastic yield points thus obtained permitted families of yield loci to be established in the stress space, depending upon the densities of the sand samples used. The proposed form of yield loci is compared with the similar loci suggested by Schofield and Wroth, and Poorooshasb, and coincidence or difference between these were examined in the light of the results of tests specially performed for this purpose.
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