Analysis of creep test on effect of rheological material on soft soil rheological parameter

Rheology is a kind of long-term deformation characteristics of soft soil, which has an important influence on the settlement of soft soil foundation. Existing researches show that high viscous rheological material in soft soil is the material basis which produces rheological properties. When the soil rheological material size is less than the critical size, soil creep characteristics are only related to the content and properties of rheological material, but not related to its shape and distribution form. Through creep test to study the effect of rheological material on soft soil rheological parameters, regarding super-hydrophilic bentonite particles as rheological material with high viscosity, using artificial soil specimen evenly mixed with different bentonite contents to conduct one-dimensional compression creep experiment. Introducing component model based on Duncan nonlinear elasticity, fitting and analysis of the creep test curve are made. The change rule of rheological model parameters is determined for the first time; according to the properties and content of rheological material, The relations between equivalent viscous coefficient, equivalent elastic modulus, Duncan nonlinear elastic modulus and the content of bentonite (rheological material) is established. Model fitting analysis shows that the rheological component model based on Duncan nonlinear elasticity has a good consistency with the test results; and relationships between model parameters and rheological material content conform to the hyperbolic equation.