Parameter Identification Of Non-stationary Creep Equation Of Rock

In recent years, rock rheological experiment research has been made great progress due to the rapid development of mechanical experiment methods and technologies. In this case, many researchers have begun to build nonlinear visco-elastic constitutive model according to experimental data. Based on the creep experimental data of shale, the relationship between stress level, time and visco-elastic deformation disciplines of rock is analyzed. Element constitutive model is adopted to testify the necessity of non-stationary parameters. One-dimensional non-stationary visco-elastic creep equation of rock is given. According to data contrast of theory and experiment, non-stationary visco-elastic constitutive model more accurately reflects the deformation capability of rock than the constant one.