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A large number of cyclic torsional shear tests on saturated soft clay under unconsolidated undrained condition have been carried out. The changing law between accumulative generalized shear strains vs. failure numbers has been analyzed and a cyclic shear strength curve has been received based on cyclic torsional shear tests. According to the test results, the criterion of saturated soft clay is approved on plane. Further, the test results are in good accord with the pseudo-static elasto-plastic creep model, which based on the cyclic triaxial tests according to the theory of pseudo-static creep. Then, dynamic character of saturated soft clay is verified from test results. The reliable proof has been provided for understanding and using dynamic character of saturated soft clay with cyclic loads, at the same time the ground has been provided for using and popularizing pseudo-static elasto-plastic cyclic strength model and pseudo-static elasto-plastic cyclic creep model.
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Li et al. (2010) studied this question.
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