This paper attempts to determine the optimal proportion of paste filler for a coal mine in China. For this purpose, an orthogonal test was designed with three factors and five levels. Then, the filler strength was measured on the 7th and 28th day of the test. Visual analysis and variance analysis show that the filler strength was mainly affected by cement content and paste concentration on the 7th day, and by cement content and fly ash-gangue ratio on the 28th day. After that, a filler strength prediction model was established through multivariate statistical analysis, and the optimal proportions for the 7th and 29th days were derived through Gaussian elimination: the cement content of 12.705%, the fly ash-gangue ratio of 0.400 and the paste concentration of 77.498%. Finally, these proportions were verified on the 7th and 29th days. The research results shed new light on the preparation of paste filler for engineering purposes
filler strength, orthogonal test, multivariate statistical analysis
NSFC (Natural Science Foundation of China) (51174109, 51074086)
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