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在大量实验室相似材料模拟试验及现场实践的基础上，探讨了低变质褐煤进行放顶煤开采时顶煤运移的特殊规律，给出了大雁矿区综放开采顶煤的运移规律和合理的分层厚度．
On the basis of a large number of laboratory similiar experiments and field practice, this paper discusses the special laws of top coal migration during the process of top coal caving with low-metamorphic lignite, and gives the law of top coal movement in fully mechanized top coal caving in Dayan Mining Area. The layered thickness.