Abstract
Based on the results of confined rheological compression test of unsaturated soil samples, some important characteristics and its effective factors have been discussed by using three-dimensional model. At first, the curves of lateral stress relaxation show the process of correspondence with vertical creep. Secondly, it is lateral total stress, and not effective stress, that is relaxed with time because of the volume viscidity of pore water and the shear viscidity of soil skeleton. At last, the limited steady rheological state of soil is controlled by stress strength.
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