新汶矿业集团某矿有可采煤层5层,受矿井前期开采布局与现阶段采掘工程进度安排的影响,上部8_(-3)、9_(-3)、10_(-1)煤层在矿井部分区域存在重复上行开采的问题。利用比值分析法、“三带”判别法对上部3层煤进行了重复上行开采可行性分析,判别8_(-3)煤层位于9_(-3)、10_(-1)煤层重复采动后的覆岩准平衡带及中裂隙亚带内。建立二维离散元模型,分析了9_(-3)、10_(-1)煤层开采后覆岩运移及应力变化情况,对理论分析结论进行了验证。 There are 5 coal seam layers in a mine of Xinwen Mining Group. Affected by the layout of the pre-mining and the schedule of the excavation at the present stage, the upper 8_ (- 3), 9_ (- 3), 10_ (- 1) Part of the region there is the issue of repeated upstream mining. Based on the ratio analysis method and the “three-zone” discriminant method, the feasibility of repeated upward mining on the upper three layers of coal is analyzed, and it is discriminated that the coal seam is located in 9_ (- 3), 10_ (-1) After the strata of stratigraphic quasi-balance zone and the middle fissure sub-belt. The two-dimensional discrete element model was established to analyze the overlying strata movement and stress changes after the 9_ (- 3), 10_ (- 1) seam mining. The theoretical analysis was also verified.