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Abstract Creep deformation and stress relaxation are the intrinsic time-dependent properties of rock mass， and are close to long term stability of rock project. The consistency of creep and stress relaxation is discussed within framework of Rice irreversible thermodynamics with internal state variable. The fundamental thermodynamic equations are developed by giving specific complementary energy function and kinetic laws of internal state variables. The creep constitutive equation and stress relaxation equation are constructed based on those fundamental thermodynamic equations with different constraint conditions. Some classical viscoelastic equations from component models are covered in proposed viscoelastic constitutive equation and hardening effect is considered in the viscoplasctic creep equation. Creep and stress relaxation characterize the same non-equilibrium evolution of microstructure within material and are consistency in essence. The creep and stress relaxation equations can be transformed each other and the parameters in those two equations are all the same. So the relaxation properties can be analyzed through creep constitutive equation and creep test. This point is validated by uniaxial creep and stress relaxation tests of analogue material used in geo-mechanical model test.
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2015, Vol. 34 
