Drained creep characteristic of silt soil based on k0 consolidation

The creep characteristic of saturated silt soil was studied through k0 consolidation creep tests under the conditions of axial loading and lateral lightening. The following results were found. First, the axial creep patterns of the two stress paths were basically consistent under the drainage conditions. The volume strains were much smaller than the axial strains. The volume strains showed an alternation between shear shrinkage and shear dilatancy with the passage of time. The Merchant and Burgers creep models both had good fitting accuracy. The creep parameter EM showed no significant increasing or decreasing trend with the increase of deviatoric stress level, but the other creep parameters EK, ηK, ηM of the two creep models decreased with the increase of deviatoric stress level. These findings suggested that the creep strain of silt soil is mildly influenced by viscoelastic modulus, but largely influenced by the viscous coefficient and elastic modulus.

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