In order to explore the effects of moisture content and plasticity index on\nDuncan-Chang model parameters K, n, C and Rf , we selected 8 groups of soft\nsoil with water content of 69.1% - 94.3% and plasticity index of 32.2 - 54.1 for\ntriaxial unconsolidated undrained shear test. The results show that Cuu, K and\nn values all showed a downward trend, and Rf variation was not obvious with\nthe increase of moisture content. The variation rule of each parameter is not\nobvious with the increase of plasticity index. When moisture content is constant,\nCuu and n values do not change much, K increases with the increase of\nplasticity index within the range of 70% - 80% moisture content, and does not\nchange much with the increase of plasticity index when moisture content is\ngreater than 80%, Rf has no obvious rule. When the plasticity index is constant,\nCuu, K and n decrease with the increase of moisture content, Rf has no\nobvious rule. The maximum value of Cuu is 20.18 kPa, the minimum is 3.72\nkPa, and the maximum to minimum ratio is 5.42. The maximum value of K is\n0.517, the minimum is 0.022, and the maximum to minimum ratio is 23.5.\nThe maximum value of n is 1.198, the minimum is 0.150, and the maximum\nto minimum ratio is 7.99. The maximum value of Rf is 0.872, the minimum is\n0.679, and the maximum to minimum ratio is 1.28.
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