For improving filling quality in deep mining, the gradationcomposition of classifying tailings was researched on fractal theory.
为实现深部开采高质量充填，用分形理论研究了分级尾砂级配。
2
Based on the influencing factors on asphalt mixture quality and service life of pavement, the control methods of broken stone diameter, gradation, composition, content of grain less than 0.