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| Application of horizontal branch hole in collapse column range control and hydraulic conductivity |
| Miao Liwei， Hu Jianqing |
| The Second Hydrological team, China National Administration of Coal Geology, Xingtai 054000, China |
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Abstract 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.
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