采用分形理论研究分级尾砂的级配。
Gradation of classifying tailings was researched with fractal theory.
应用知识库模型可以根据尾砂的级配特性，预测不同水泥含量、不同浓度下的尾砂胶结充填体强度，指导矿山充填设计。
According to gradation of tailings, the knowledge bank model can predict the strengths of cemented tailings in different contents of cement or consistence, and guide filling design in mine.
大坝垫层料采用以天然砂砾料为主、掺入小石和粗砂以调整级配的方式生产。
The cushion layer for the dam is constructed with the material prepared mainly with natural sandy gravel and mixed with proper amount of pebble and coarse sand.
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