A mixture was prepared by adding 30％and 50％of Class Ⅲ cement-based grouting.The mechanical properties and uniaxial compressive stress-strain relationship of Class Ⅲ and Ⅳ cement-based grouting and their mixture were studied using ordinary concrete mechanical property testing methods and engineering rock mass testing methods.Calculation formulas for the conversion between cubic compressive strength and axial compressive strength,elastic modulus,peak strain,etc.were established.Based on the stress-strain curve formula of the Guozhenhai model,a uniaxial compression constitutive model applicable to cement-based grouting materials and its mixtures was proposed.The results indicate that the toughness of Class Ⅲ cement-based grouting is higher than that of Class Ⅳ cement-based grouting.With the increase of the dosage of Class Ⅲ cement-based grouting,the toughness of the mixture has also been improved to a certain extent.The fitting curves of the Guozhenhai model is generally in good agreement with the experimental curves.
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