Abstract:Fluidity and strength are two key indicators to determine the working characteristics of filling slurry. In order to study the working characteristics of high concentration self-flow filling of tailings and the influence of related factors, the blending ratio test was carried out by using the A1.2U6 uniform design method. The cement content, slurry concentration and filler dosage were used as variables, and the uniaxial compressive strength, diffusivity and slump were taken as indicators to perform the filling, the working characteristics and influencing factors of the filled slurry were studied. The results indicated that the slurry concentration was negatively correlated with the fluidity. The Minefill and cement content were positively correlated with the fluidity, and the slurry concentration had the greatest influence on the fluidity, followed by Minefill and the cement content was the smallest; the effect of Minefill on the high-concentration slurry was more obvious. When the concentration was 68%-70%, the diffusion degree can be increased by 30 cm and the slump degree can be increased by 1-6 cm. The cement content and slurry concentration were positively correlated with the strength, and the cement content had a greater influence on the strength, while the Minefill had no effect on the strength; When the Minefill dosage was 550 mL/t, the cement content can be increased by 1% and the strength can be increased by 0.1 MPa, and the slurry concentration can be increased by 1% and the strength can be increased by 0.05 MPa.