A widely distributed salinized silt in Northwest China exhibits the physical characteristics of both low-liquid-limit silt and saline soil

yet its long-term deformation behavior remains insufficiently understood. A series of uniaxial creep tests were conducted to investigate its creep properties under varying conditions of salt content

dry density

moisture content

and overburden stress. Test results indicate that

compared to salt-free soil

the creep rate of salinized silt accelerates significantly with increasing salt content

demonstrating more pronounced nonlinear creep characteristics. The final strain of the salt-washed soil was 10%

which increased to 14% at a salt content of 6.4%. To more accurately characterize the soil’s creep behavior

the classical creep models were modified

leading to the proposal of two new models: an integer-order model and a fractional-order model. Comparative analysis between the experimental data and the improved models shows that both proposed models describe the actual deformation characteristics more accurately than the classical creep model. However

the integer-order model lacks refinement in describing the decay creep stage

whereas the fractional-order model demonstrates superior accuracy in capturing the detailed features of all creep stages and is therefore recommended for effectively predicting the creep behavior of salinized silt.