Using modified distinct element method, simulation research is conducted on top coal movement at fully -mechanized working face in No2 Coalmine of Dayan Coal Bureau.

• 用改进的离散元法对大雁矿务局二矿综采放顶煤工作面顶煤活动规律进行模拟研究,分析支架围岩作用关系,找到顶煤丢失原因。