Abstract：Based on triaxial shear tests (CU) of saturated soft clay of marine deposit，the behaviors of stress-strain relationship of undisturbed soil of marine deposit，remolded soil and overconsolidated soil were analyzed. For the undisturbed soil treated with dynamic consolidation by drainage，the strain softening occurred in process of shearing；and remolded soil presented strain hardening in process of shearing under low confining pressure，but it has strain softening phenomenon under higher confining pressure. The stress-strain relationship curves of soft clay under these three states have better normalization to confining pressure. The test results show that the physico- mechanical properties of undisturbed soil，remolded soil and overconsolidated soil have different improvement in degree. Undisturbed soil treated with dynamic consolidation by drainage has some characteristics of overconsolidated soil；and overconsolidated characteristics of remolded soil treated with dynamic consolidation by drainage are obvious in process of shearing.
