下伏煤层群重复采动下上行开采可行性分析

Feasibility Analysis of Ascending Mining under Underlying Coal Seams Repeated Extraction

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。

A coal mine of Xinwen mining group has five coal seams that can be mined. In some areas of the coal mine, No.84, No.9-3 and No.10-1 coal seams have ascending mining repeated because of the mine pre-mining layout and the current mining projects progress. According to discrimination ratio law and ＂three zones＂ discrimination methods, No.8-3 coal seam lie in the quasi equilibrium and fracture belt after No.9-3 and 10-1 coal seams repeated ascending mining. By discrete element method,the effects of the strata movement and stress changes after No.9-3 and No.10-1 coal seams extraction are analyzed.