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| Study on influence mechanism and parameter optimization of extraction concentration of high roof borehole in Wanfeng Mine |
| Li Xiaobin 1, Li Runzhi 2, 3 |
| 1. Shanxi Jinhui Wanfeng Coal Mine Co., Ltd., Lvliang 033400; 2. Shenyang Research Institute Co., Ltd., Fushun 113122;
3. State Key Laboratory of Coal Mine Safety Technology, Fushun, Liaoning 113122, China |
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Abstract In order to ensure the gas extraction effect of high roof drilling and improve the extraction efficiency of high roof drilling. According to the actual situation of Wanfeng Mine, the development range of caving zone and fractured zone in mining face is analyzed. Through the field investigation of the extraction effect and a large amount of data analysis of the roof boreholes arranged in the high drilling field of 1115 mining face, the key technical parameters of roof boreholes in Wanfeng Mine are finally determined. The research shows that the effective layer of roof drilling after periodic weighting of main roof in Wanfeng Mine is 9 ~ 15 m above the roof of No.1 coal seam. The distance of the effective section of the roof borehole along the inclined internally staggered return airway is about 15-28 m, which provides a reliable basis for gas control in the upper corner and goaf.
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