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Keyword: close seam;3DEC numerical simulationinter;floor roof;breaking law Abstract. Based on the analysis of the breaking of the roof between the lower layers of the short distance thin coal seam group with different spacing, it is proposed that the roof of the short distance thin coal seam can be divided into three types according to its lithology and the development of joints and cracks: the unstable interlayer roof structure. Medium stable interlayer roof structure and stable interlayer roof structure. The breakage mode of roof under different roof structure is also analyzed in this paper. The 3DEC numerical simulation model of different interstory roof structures is established, and the displacement and stress distribution of the roof between different propulsive distances are analyzed. It is concluded that the unstable interstory roof structure is broken by loose body. The structure of medium stable interlayer roof is block broken and stabilized interlayer. The roof structure is plate broken.

Analysis of Interlayer Roof Structure and Breaking Model of Close-range Coal Seams