煤层群上行开采对上覆煤层运移的影响

The influence of ascending mining on the movement character of overlying coal seam in coal seams group

综合运用理论计算、现场实践、UDEC数值模拟分析等方法对赵各庄煤矿煤层群上行开采选择不同首采厚度时上覆煤层的运移破坏特征及对上煤层瓦斯的卸压效果进行了分析,并结合现有开采技术条件,最终确定首先开采12号煤4 m顶分层,然后开采9号煤,最后利用放顶煤工艺开采12号煤的下分层是科学合理的开采方式。

The movement and damage character and pressure relief effect on coal seam gas of the over strata were analyzed in ascending mining under different first mining thickness of the under seam in the short-distance coal seams group of Zhaogezhuang Coal Mine through theoretical calculations,field practice and UDEC numerical simulation.With existing mining conditions,the results show that first mining 4 m of the top layer of No.12 coal seam,then mining the No.9 coal,finally using top-caving technology mining the under layer of No.12 coal seam is a scientific and reasonable exploitation method.