To predict the time-dependent deformation of a clay deposit during and after the construction of a foundation, such as a bridge foundation, a relevant constitutive model of clay that can simulate the effects of the viscous property for arbitrary loading histories is necessary. A series of consolidated drained triaxial compression (CDTC) tests were performed changing the strain rate many times and performing creep tests and global unloading and reloading tests during otherwise monotonic loading. Undisturbed samples of Pleistocene clay from the Tokyo and Osaka bay areas and their reconstituted specimens were used. The general trends of viscous property of undisturbed and reconstituted clays are similar, whereas the ratio of the viscous stress to the inviscid stresses according to the referred non-linear three-component rheology model is noticeably larger with the reconstituted clay. All the test data are simulated very well by the model.
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