水平分支孔在陷落柱范围控制和导水性方面的应用

Application of horizontal branch hole in collapse column range control and hydraulic conductivity

郭二庄矿陷落柱比较发育,部分陷落柱是在勘探过程中发现的,存在的弊端是垂直钻孔揭露的陷落柱范围只能靠推断,范围控制性差。通过定向水平分支孔的施工,对施工中取得的岩屑、钻效、自然伽马曲线、消耗量等数据进行前后综合对比分析。确定异常岩屑、自然伽马、明显提高的钻效、消耗量可以准确的判断陷落柱在顺钻孔方向的起止范围及导水性,使煤矿对陷落柱的控制程度大大提高,对采煤过程中陷落柱的防水煤柱留设、治理起到积极指导作用。

The collapse columns were relatively developed in Guoerzhuang mine,some of which were discovered in the process of exploration.The disadvantage was that the range of the collapse columns exposed by vertical drilling hole could only be inferred and the range is poorly controlled.With directional horizontal branch hole constructed,data obtained in construction were compared and analyzed comprehensively all around,including rock debris、drilling efficiency、gamma ray curve and consumption.Collapse column starting and ending range and hydraulic conductivity in the drilling hole direction could accurately be determined by identifying abnormal rock debris、gamma ray、significantly improved drilling efficiency and consumption,which made the control degree of collapse column greatly improved in coal mine.The study played a positive guiding role in the collapse column waterproof coal pillar setting and management in the process of coal mining.