Abstract: The experiment method of standard orthogonal regression design was used to conduct the study of the cemented filling strength of the total iron mine tailings in Hebei Province. The relationship between the cemented filling strength and such factors as the slurry density and cement dosage was analyzed. The regression equation for 28 d cemented filling strength was obtained, from which it is concluded that the increase of the slurry density or of the cement dosage can raise the strength of the cemented filling body, providing a theoretic basis for optimizing the mix of cemented filling slurry and the on-line automatic control of cemented filling strength.

Key words: Orthogonal regression design, Cemented filling strength, Slurry density, Cement dosage