水体下采面“上三带”高度计算分析

Analysis on calculation for the height of "upper three zones" on mining face under water-bodies

为验证芦沟井田区域水体下采煤工作面"上三带"高度,在已回采结束的水体下采煤工作面地表施工煤层顶板"上三带"钻孔,完成了钻孔取心,水文观测、RQD值统计等各项工作,得出"上三带"高度。并利用经验公式计算出煤层顶板"上三带"高度值与钻孔实测值对比分析,确定了适合芦沟井田区域煤层顶板垮落带、导水裂缝带高度的计算公式,确保了矿井的安全生产。

To validate the height of three zones on mining face of mining under water-bodies in Lugou mine shaft,a drillhole on the roof of forefield was implemented after backstopping. The borehole coring together with hydrologic observation and statistics on RQD were conducted to derive the height of height of three zones. The formula for calculation of caving zone and diversion fissure zone were established through comparison between the value obtained by empirical equations and the value by drilling observation,providing a reliable reference for estimation of three zones on mining face of mining under water-bodies. It is helpful for ensuring safe production.