This paper investigates the combined effects of dynamic stress

initial’ static shear stress

consolidation ratio and vibration frequency on growth of accumulative plastic strain of soft clay located in Lingang industrial district

Tianjin Binhai New Area.A series of cyclic triaxial tests is conducted with continental facies soft clay samples by GCTS triaxial torsional shear apparatus.It is observed that when shear stress increases

the ability of resisting cyclic loading enhances.The decaying rates of softening index become slow at the same time.Consolidation ratio affects similarly on growth of accumulative plastic strain.Empirical formulation between softening index and accumulative plastic strain is established considering various influencing factors above-mentioned.Based on previous results

referring to the relationship between softening index and vibration times of cyclic loading N

a new accumulative plastic strain growth model is proposed for soft clay in Tianjin Binhai New Area

including four types of influence factors.And applicability of this model is verified.