Experimental study on strength of cemented rock-tailings backfill

Waste rock tailings cementation filling is a filling technique that effectively disposes waste rock and tailings in mines, saves energy, and reduces costs. This paper systematically studies the cementation and filling strength of waste rock tailings. The relationship between compressive strength, shear strength and content ratio of waste rock and tailing sand, cement-sand ratio, concentration parameters and the variation of strength were analyzed by orthogonal test. Sensitivity analysis of factors affecting strength of backfill is conducted using extreme range in data process. Then the order of sensitivity is obtained as content ratio of waste rock and tailing sand > cement-sand ratio > concentration, the relationship between factor and strength is established and the optimal mixing proportion of materials is found. It provides the basis for the filling process design.