In this study

one-dimensional consolidation creep test was conducted to study the consolidation creep characteristics of the sandy grain muddy soil of Dongting Lake

and an empirical creep model suitable for describing the stress-strain-time relationship of the sandy grain muddy soil of Dongting Lake was established based on the test results. The results show that there is a good linear increasing relationship between axial strain ε and time t in double logarithmic coordinate system. In addition

with the increase of consolidation stress

the slope of - relationship curve decreases significantly

and the distance between - relationship curves becomes shorter under the action of two adjacent loads. Under high stress levels

the - relationship curve tends to be horizontal

and the decrease rate of the slope of the curve is significantly reduced. Moreover

hyperbolic function is more suitable than exponential function to describe the stress-strain relationship of the sandy grain muddy soil of Dongting Lake

and it is more in line with engineering practice to modify the strain-stress relationship in Singh-Mitchell model to hyperbolic relationship. It is found that the slope of the - relationship curve has a hyperbolic function relationship with the consolidation stress. On this basis

a modified Singh-Mitchell model with five parameters reflecting the influence of stress level and suitable for describing the creep characteristics of the sandy grain muddy soil of Dongting Lake is established.