Abstract
The purpose of this study is to obtain the optimal proportion of the full tailings cement filling, reduce the filling cost of the mine and ensure the stability of the empty area. Taking the whole tailings cemented backing block as the research object, the uniaxial compressive strength of the test block as the index, the filling body is investigated comprehensively. The influencing factors of strength were studied by orthogonal experiment, and the sensitivity and significance of the influence factors of the filling body strength were analyzed by using the range and variance analysis methods. The results show that, when cement content is increased, paste setting time is shorten and paste strength is enhanced; proper quantity of fly ash can improve the liquidity of paste, while degree of segregation and bleeding rate of paste are increased with the increase of fly ash; When cement ratio is 20% and the rate of fly ash: coal gangue is 1: 4 and the concentration of the paste is 75%, the pumpability and strength of paste is the best.
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