The creep property of the salt rock is an important determinant of deep underground repository of energy for long-term operation.New fractional derivative creep model was built by using the Abel dashpot and Abel dashpot with strain triggered based on the definition of fractional derivative. Through over 4 months’ experiment,creep curve for the whole process was got.Based on the experimental data of the salt rock creep,fitting analysis on parameters of fractional derivative creep constitutive model was provided and the parameters of the model were determined.In addition, comparing the fractional derivative creep model with the Nishihara model, it is found that fractional derivative model is in better agreement with the experimental data.The model not only overcomes the drawback that integer-order creep model is not in good agreement with the experimental data at the primary creep stage, but also reflects the whole process of creep characteristics of salt rock.
