Abstract: Room-pillar mining method of afterwards dry-filling has been adopted at a lead-zinc mine in Yunnan province. Because of non-ideal top filling, large goaf has formed and produces big effects on stoping of deep orebody and recovery of pillar, meanwhile stacking of tailings on the ground has a great influence on the environment. To meet the different intensity requirement of filling for goaf and realize green mining, experimental study on proportion of paste-tailings cement filling materials is needed. Started from mechanical behavior of whole tailings filling materials, slumps of backfill pulp was measured and rheological property analyzed to confirm the experimental weight concentration range then to prepare filling test block, measured its 3, 7, 14, 28d intensity. The initial setting intensity, long-term intensity and consolidation performance of paste filling material were analyzed. Through analysis of rheological property and strength performance of filling material, cement-sand ratio and filling material proportion for different purpose were obtained.

Key words: Total tailing paste filling, Rheological property, Strength property, Engineering ratio parameters