Abstract: Creep behavior is one of the important mechanical properties of rock material, and is closely related with the long-term stability and safety of rock engineering. To investigate the creep characteristics of Carbonaceous slate, uniaxial creep tests under different stress levels were carried out on RLW-1000 rheology testing machine. The creep test result was analyzed by using generalized Kelvin model, Burgers model and FC (function component) assembly model. The results showed that FC model had good fitting results in low stress level, while in high stress level, Burgers model had better fitting results than the other two models. In general, Burgers model could effectively reflect the creep characteristics of carbonaceous slate in all stress levels. Moreover, parameter fitting results in different stress levels indicated that the viscous coefficient increased along with the time development in low stress level, and significantly reduced with time in high load stress, which presented as the function of time and stress-level. The research results can offer model parameters and design basis for further understanding the creep properties of carbonaceous slates.

Key words: creep test, generalized Kelvin model, Burgers model, FC assembly model, parameter fitting