Duncan-Chang model can reflect soil’s nonlinear behavior much better, its’ concept is clear and easy to understand. In this paper, through triaxial test, parameters of Duncan-Chang model were gained by analyzing characteristics of Silt’s stress-strain Cures. A key factor, effecting silt’s stability, is the moisture content; there is a optimum moisture content in silt, in this moisture content, silt’s parameters of Duncan-Chang model can reach to the optimal state.
Constitutive relation of soil is the core issue to study on soil’s mechanics characteristics. The stress-strain curve to silt belongs to intenerate type under low confining pressure and low moisture content, then silt features brittle failure; but it belongs to sclerotic type under high confining pressure and high moisture content, then silt features plastic failure. The conclusion of the article had some value for engineering’s design and calculation.
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