Abstract: The creep of soil is affected by many factors , behaving variable under different conditions. Tianjin Binhai dredger fill also has soft soil creep characteristics possessed by the general. Unconsolidated and non-drained triaxial tests and uniaxial compression creep tests were carried out with the soil triaxial rheological testing machine to study the creep characteristics of soft dredger fill, 10 time node samplings during creep have been selected for miniature vane shear test to study the variation of long-term strength. The results showed that: uniaxial compression creep and triaxial creep duration curve has a nonlinear characteristic, the isochronous curves deviated to the stress axis with the improvement of stress in uniaxial compression creep, while the isochronous curves deviated to the strain axis in triaxial creep. Viscosity coefficient is merely relative with the time under the linear condition, while associating with time and stress level on the nonlinear condition. In the three axis creep condition，the compression modulus decreases with the time increasing, the long-term strength firstly decreases and then tends to be stable over time. The uniaxial compression modulus increases with time increasing, Therefore the functional relations of the long-term strength are derived with time and deviatoric stress under different states of stress.

Key words: soft clay, creep, viscosity coefficient, long-term strength