Abstract
In order to overcome the difficulty of choosing appropriate grading parameters of filling material for mines which are using filling mining method, the fractal theory is introduced, and a fractal equation of grading is built to represent gradation. Meanwhile taken Dahongshan copper mine as an example to discuss the relationship between fractal dimension and porosity, cementing strength under different parameters. A prediction model of cementing strength is built based on the experimental data, and the results show that the optimal grading parameters of Dahongshan copper mine is fractal dimension = 2.82. The optimized grading parameters of filling material in Dahongshan run steady, which greatly reduced the filling cost.
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