为了研究郭屯煤矿首采区3下煤层已采区域上部3上煤层在不同层间距下的上行开采问题，基于煤层赋存条件和开采现状，通过理论公式得出垮落带和裂隙带高度，进而模拟并分析了不同层间距下3下煤层开采后3上煤层的变形和破坏特征。结果表明：层间距大于15 m时，下部采动对3上煤层影响较小；层间距为10～15m时，3上煤层大部分受破坏，只有局部可采；层间距小于10m时，3上煤层整体性遭到严重破坏并发生台阶错动，无法进行上行开采。通过“两带”高度观测，得出垮采比和裂采比分别为5．65和16．52，与理论分析和数值模拟结果相近，进一步验证了3上煤层上行开采可行性。%In order to study the upward mining problem under different layer distance on the No .3 upper coal seam above the area that had been mined of the No .3 lower coal seam of Guotun coal mine first mining area ,based on the coal seam conditions and mining situation ,obtained the height of caving zone and fractured zone through empirical formula ,then simulated and analysed No .3 upper coal seam deformation and failure characteristics after mining No .3 lower coal seam .the results show that ,when distance is more than 15m ,the lower mining has little effect on No .3 upper coal seam ;when distance is about 10~15m ,No . 3 upper coal seam is damaged seriously ,only partially recoverable ;when distance under 10m ,the integrity and continuity of No .3 upper coal seam has been seriously undermine ,and the occurrence of greater value level dislocation ,and can not be upward mining .Through “two zones” field measurement ,obtained the collapse production and crack‐production ratio ,is respectively 5 .65and 16 .52 that similar with the theoretical analysis and numerical simulation results ,further demonstrate the upward mining feasibility of 3 up coal seam .
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