VISCOELASTIC ANALYSIS AND PARAMETER IDENTIFICATION OF TRIAXIAL CREEP EXPERIMENT OF ROCK

Based on the triaxial creep experiment of rock, the viscoelastic analytical solutions are obtained and aviscoelastic parameter identification method is proposed according to thethree-parameter H-K model. The viscoelastic parameter identification andback analysis are carried out by using the multi-stage loading creep curvesof granite and schist. The results of analysis show that the elasticparameters and viscoelastic parameters of the same sample change withdifferent step loading, in particular, there is a damage attenuation ofviscoelastic modulus and viscosity coefficient with loading. The obtainedanalytical curves using the back-analysis parameters agree with theexperimental creep curves very well.