Abstract：This paper presents the results of an experimental investigation performed to study the influences of static and cyclic deformations on undisturbed and remolded soft clay sampling. The tests indicate that the deformation of undisturbed soft clay changing with stress level could be divided into three stages. The preconsolidation and structural yielding stress are the cut-off point of these three stages and they could be determined by shear wave velocity measurement. The deformation characteristic of remolded clay is almost independent of stress level. When carrying out cyclic triaxial tests，the strain curves with cycle number of natural and remolded soft clay have all turning points under different amplitudes of stress. Before the turning points appear，the strain develops slowly and keeps to a small level. But after the turning points appear，the strain develops quickly and becomes large finally. The strain at turning points changed with different stress amplitudes，but they almost fall on a same line and could be fitted by a linear equation. The change of fitting parameters of natural soft clay could also be divided into three stages which correspond well to consolidation tests. And similarly，the fitting parameters of remolded soft clay almost did not change with stress level. The deformation characteristic of these two kinds of soft clays tends to be consistent when the structure of natural soft clay is damaged.
