Study of Nonlinear Creep Model of Q2 Loess Considering Water Damage
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Abstract:
Triaxial creep experiments were performed on Q2 loess with different moisture contents. The experimental results showed that the rheological properties of Q2 loess strengthen with the increasing of moisture content. According to the experimental curve shape characteristics, the nonlinear viscoelastoplastic model (improved Nishihara model) was constituted by connecting a generalized Kelvin model with a nonlinear viscoplastic body in series. The improved Nishihara model was used to fit the test data and analyze the model parameters, which suggested that instantaneous deformation modulus (EH), viscoelastic modulus (Ek), and viscoelastic coefficient of viscosity (ηk) decrease in the exponential form with the increasing of moisture content. The water damage parameter D(ω) was introduced to derive the damage evolution equation of each creep parameter, and the nonlinear viscoelastoplastic model with water damage effect was established. The experimental data were used to verify the model, and the results suggested that the nonlinear creep model considering water damage can characterize the overall rheological properties of Q2 loess effectively.
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