The hardened effect that represents the soft clay harden gradually with the increment of consolidation time

makes dynamic shear modulus of soft clay increasing;meanwhile

the size effect that represents the height and diameter of the sample decreasing gradually

also produces effects on dynamic shear modulus of soft clay.A serial of free vibration column tests of soft clay is conducted to analyze the effects of consolidation time on maximal dynamic shear modulus

dynamic shear modulus ratio and sample’s size of soft clay.According to the basic principle of the free vibration column test

the effects of varied sizes of sample on dynamic shear modulus of soft clay are analyzed.Combined with the relationships between consolidation time and sample′s size obtained from the tests

the size effects of consolidation time on maximum dynamic shear modulus of soft clay are analyzed.