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Abstract Based on the viewpoint of traditional modulus softening method and hyperbolic constitutive model，a formula of permanent deformation changing with time was established. Compared with results of dynamic triaxial test，it was found that the formula was impossibly used for the silty sand which was easily liquefied. On this basis，a rheological term was introduced into the stress equilibrium equation，by which the character of silty sand permanent deformation could be described properly. At the meantime，the way of calculating related parameters in the equations was also introduced. Plugging these parameters into the equilibrium equation，it showed that the numerical calculating results were highly identical with the test results. Although some problems needing for further studies，a new idea in studying the permanent strain was provided.
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2015, Vol. 34 
