Study of nonlinear creep model of earth-rock aggregate embankment

According to the nonlinear creep properties of earth-rock aggregate embankment after construction, a modified Kelvin model that can express nonlinear viscoelastic deformation of material is presented. Based on the current research results of the creep mechanism of earth-rock aggregate embankment, the creep settlement after construction is considered to be an attenuation creep process; and the modified Kelvin model, generalized modified model and recognition method of model parameters are presented. Through analyzing the modified Kelvin model, the results show that: the nonlinear constant is an important influencing factor to the model; and long-term strain of the modified Kelvin model is smaller than that of Kelvin model. Based on the creep test data in the related literatures, parameters of modified Kelvin model are fitted; and the fitting effect is well. The modified Kelvin model will distribute theoretical basis for the numerical calculation program of nonlinear viscoelasticity.