Abstract
By the use of a triaxial torsion shear test apparatus, statically operated cyclic loading tests were conducted on loose saturated specimens of the Japanese standard sand. The stress difference between the axial and horizontal stresses as well as the torsional shear stress was cyclically applied to the test specimens so that the continuous rotation of the principal stress directions could be achieved during the cyclic loading. The test results showed that, even when the amplitude of the combined shear stress (deviator stress) is maintained constant, the plastic deformation as represented by the pore water pressure build-up and progressive accumulation of volumetric strain could take place in the sand, if the rotation of the principal stress axes is executed during the cyclic loading.
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