Rock creep deformation and failure characteristics are discovered and rock creep velocity and propagation process under different stress paths are represented through argillaceous sandstone creep tests. A nonlinear creep model for argillaceous sandstone is set up. Creep characteristics of surrounding rock in underground engineering under the condition of plane strain and support are represented through the application of lateral and anchoring constraints

respectively. The research results show that anchoring constraint can increase the critical stress value that rock produces stable creep and decrease creep velocity evidently. The parameters for creep constitutive equation is determined by the fit of experimental data according the improved visco-elastoplastic creep model. The calculated strains according to the obtained parameters are in good accordance with experiment results

which can be effectively validated that the improved creep model describes the creep characteristics very well. This research is very significant for the study of deformation and stability of surrounding rock mass in deep underground engineering.