Analysis On One Dimensional Consolidation Behavior Of Saturated Soft Clay Under Cyclic Loading

This paper presents analytic solutions to one dimensional elastic and viscoelastic consolidation problem with impeded boundaries and impervious boundaries under cyclic loading, such as rectangular loading, triangular loading, sinusoidal loading, etc.The general solutions to one-dimensional consolidation of multi-layered soils with impeded boundaries and impervious boundaries under cyclic loading are given.On the basis of the solutions obtained and the computation through programming, the influence of some parameters and loading conditions on the consolidation behavior under rectangular loading, triangular loading, sinusoidal cyclic loading, is investigated. Variation rules of the average consolidation degree, the effective stress and the excess pore water pressure with corresponding cyclic loadings are studied. This paper presents some useful conclusions though comparison among models based on different boundaries and constitutive model.It has been shown that under cyclic loading, the effective stress in soil develops in a delayed way instead of change synchronously with loading. The farther from drainage surface the soil mass, the larger the aforesaid delay is. The effective stress reaches the stabilized state in the end under the various cyclic loadings with certain amount of cycles. It's also found in every case the change of effective stress ratio will approximate zero. It is shown that the permeability of impeded layers has important influence on the rate of consolidation. The effective stress ratio increases in oscillation, while the variation magnitude is largest under rectangular loading. The rheopectic feature mainly functions in the intermediate and long-term stage of consolidation. Upon consideration the rheopectic feature of soft clay, the time needed to reach settlement stabilization will be larger.