Abstract
A cooperative test program of cyclic undrained triaxial tests was performed by five laboratories for both loose (Dr=50%) and dense (Dr=80%) air-pluviated specimens of Toyoura Sand, which is a clean fine uniform sand having sub-angular to angular shaped particles. This test material has been widely used in Japan for the study of sand liquefaction. The tests were performed following the specified test procedures described in this paper. It was found that the cyclic undrained strength value for a specimen diameter of 5 cm is slightly larger than that for a specimen diameter of 7∼10 cm. The major part of the scattering of the data was found due to different specimen diameters. For a similar specimen diameter, a very good degree of agreement for cyclic undrained strength value was obtained.
