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Triaxial creep tests on CCG specimens were systematically performed using aself-made creep seepage experimental apparatus for determining the creep law of CCG.An improved triaxial creep model of CCG was established on the basis of a Nishiharamodel and another visco-elasto-plastic model,parameters of which were fitted on test data.Furthermore,the creep model is validated according to the result of triaxial creep experiments,and the outcome shows that the proposed triaxial creep model can properly characterizethe properties of various creep deformation phases of CCG,especially the acceleratingcreep phase.At the same time,the instability conditions of CCG were presentedbased on the discussion of the improved model’s stability in terms of stability theories ofdifferential equation solution.
Triaxial creep tests on CCG specimens were systematically performed using a self-made creep seepage experimental apparatus for determining the creep law of CCG. An improved triaxial creep model of CCG was established on the basis of a Nishiharamodel and another visco-elasto-plastic model, parameters of which were fitted on test data. Still further, the creep model is validated according to the result of triaxial creep experiments, and the outcome shows that that proposed triaxial creep model can properly characterizethe properties of various creep deformation phases of CCG, especially the accelerating creep phase .At the same time, the instability conditions of CCG were presented in the discussion of the improved model’s stability in terms of stability theories of differential equation solution.