A viscoelastic shear creep model of mudstone. parameter identification
Abstract：A Burgers viscoelastic shear creep model is used to identify the creep parameters of mudstone. Experimental tests on mudstone were used to investigate the time scale effect on the model parameters. This model is not ideal for predicting long term deformation. The stationary creep stage was used to linearly fit the viscous coefficient, η2, thereby allowing more accurate long term predictions. However, the Burgers model did not show good agreement with short time scale test results. The parameter, Q, from a nonlinear viscoelastic shear creep model range from 0.56×10^-8～1.49×10^-8 , which is lower than the 0.16×10^-8～8.15×10^-8 obtained from the Burgers shear creep model. Hence, nonlinear viscoelastic shear creep pro- vides better agreement with the experimental results than the Burgers shear creep model for long term creep deformation predictions.
Keywords：rock mechanicsnonlinearvisco-elasticshear creep modeltime scale effect
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 551-557 )