Abstract:In nature,the pure glauberite appears in the form of compound with structural formula of Na2Ca(SO4)2,but in the sample it appears in the form of mixture by glauberite and claystone internally,which determines that its mechanical and creep properties are different from those of general salt rock. Uniaxial compression creep test over 100 days is carried out under different stress levels. It is found that the creep velocity under high stress level is larger than that under low stress level,and the creep velocity and creep deformation are lower than those of general rock salt. By regressive analyses,the creep curve equations of glauberite salt rock under different stress levels are obtained,and creep constitutive relation of glauberite rock salt by comparing the creep curves with the theoretical curves is discussed. It is found that the Nishihara model containing viscoelasto plastic unit can better reflect the glauberite creep rule,and the correlation parameters are fitted as well.