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| Practice of comprehensive outburst prevention technology for uncovering coal in main inclined shaft of Libi Mine |
| Yang Gang1, Bai Junjun2, Lian Yingli3, Hao Guoqiang4, An Fengjiang4 |
| 1. Shenyang Research Institute Co., Ltd., China Coal Science and Industry Group, Fushun 113122, China; 2.China Coal Huajin Group Jincheng Energy Co., Ltd., Jincheng 048299; 3. Shenhua Geological Exploration Co., Ltd., Beijing 100011;
4. School of Mining and Surveying and Mapping Engineering, Hebei University of Engineering, Handan 056038, China |
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Abstract The main inclined shaft of Libi Mine has high gas content and high gas pressure in the No.3 coal seam area. It is a dangerous area for outburst, and comprehensive outburst prevention measures need to be taken. When regional extraction and outburst prevention measures are taken, the construction pilot tunnel is used as the extraction drilling field, which solves the problem of limited construction site of extraction drilling. The gas content after extraction is reduced from 19.56 m3/t to 4.94-7.76 m3/t by using the techniques of hole expansion, closure of extraction drilling and reservation of water and slag storage space. At the same time, the No.3 coal seam was successfully uncovered by a series of measures such as regional verification before 5 m normal distance, coal uncovering before 2 m normal distance, strengthening support of metal skeleton, and long-distance blasting of ' coal gate '. Aiming at the problem that the main inclined shaft has a long stage of ' crossing the coal gate ' and the long-distance blasting can not open the No.3 coal seam at one time, the drilling cuttings index method was used to predict the outburst risk of the heading face in the coal seam section of 9 cycles. After each prediction of no outburst risk in the working face, the heading operation was carried out and the coal seam was passed smoothly. The comprehensive outburst prevention technology of main inclined shaft uncovering coal in Libi Mine solves the technical problems of inclined shaft construction in outburst mine, and provides technical reference for inclined shaft uncovering coal in outburst mine at home and abroad
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