极近距离下位煤层巷道合理布置与支护设计

Roadway layout and support design in lower seam of ultra-close coal seams

依据平煤四矿己组极近距离煤层条件,综合采用数值模拟等方法,对下位煤层巷道合理位置与支护方式进行了系统研究。结果表明,不同层间距条件下巷道围岩变形随内错距离增加而减小,综合考虑回收率等因素确定巷道合理内错距离为30m,同时依据"分区支护,分源控制"和"及时主动支护,支护结构强化"围岩控制对策,提出了以煤层层间距为指标的"锚带网索棚"分区支护方案,并通过工业性试验验证了方案的有效性。

Combining with the geological conditions of Pingmei No.4 mine,reasonable position of roadway for lower of ultra-close coal seam is studied by numerical simulation.The results show that the deformation of surrounding rock of roadway decreases with the increase of the inner stagger distance under different layers.The reasonable inner stagger distance of roadway is 30 m.According to the surrounding rock control countermeasures of actively division support,the paper proposes a division support scheme of combined support with bolt-mesh-cable-shed with space of coal layers as indicators.The field practice shows that combined support has well controlled the deformation of surrounding rock.