Abstract：Considering the problems of adopting rod mill sand filling material because high mining cost and demand have exceeded supply at present, the experimental research is carried out for the cementation strength of filling body with mixed filling aggregate including sand maker-rod mill, Gobi sand and tailings for different proportions. By the analysis of test data for the strength of cemented filling body, the influence factors on the strength of filling body are obtained. The results show that the reasonable ratio of tailings adding into the mixed filling materials rod mill sand and Gobi sand can increase the strength of filling body and decrease the layering and isolating of the slurry witch, improving the quality and integrality of filling body. Based on a neural network model and regression analysis for the mixed filling aggregate with different ratios, the results for the design strengths of Jinchuan mine are obtained. It is indicated that the cement-sand ratio is 1∶ 4, slurry concentration is greater than 80. 8%, aggregate average particle size is not more than 1. 692 mm, and non-uniform coefficient is not less than 38. 4. The corresponding filling block density of 3 d is not less than 2. 24 g / cm3.The results provide a theory basis for the application of mixed filling aggregate in Jinchuan mine.

Keyword：mixed filling aggregate;average grain diameter;uniformity coefficient;strength of filling body;