To explore the characteristics of the dynamic shear modulus of structural soft soil, undisturbed structural soft from the floodplain of the Yangtze River in Nanjing was subjected to strain-controlled cyclic triaxial tests to investigate how the initial effective confining pressure ( σ ' m ), consolidation ratio ( k c ), and degree of consolidation ( U ) influence the maximum dynamic shear modulus G max and dynamic shear modulus ( G ) and damping ratio ( λ ). The results show that for this soil, G decreases with increasing shear strain amplitude ( γ ), and for a given γ , G increases with increasing σ ' m , k c , and U . Compared with soil from the Yangtze estuary, k c has a greater effect on G max of the floodplain structural soft soil. Finally, a modified Martin-Davidenkov model is proposed for predicting G / G max of floodplain structural soft soil under different σ ' m , k c , and U.
Wang et al. (Mon,) studied this question.