期刊
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
卷 26, 期 1, 页码 139-147出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijmst.2015.11.022
关键词
Large mining height; Small gateroad pillar; Top coal caving longwall mining; Hydraulic fracturing; Gob-side entry driving
资金
- United Foundation key project fund
- Chinese Natural Science Committee [U1261207]
- Datong Coal Group, Tashan Coal Mine
- Natural Science Foundation of Ningbo of China [U1261207]
Coal seams in Tashan Mine of Datong Coal Group in China average 15 m thick and have been mined by the top coal caving longwall mining method of large mining height. Mining height was 3.8 m and the top coal caving height was 11.2 m. The gateroad pillar between panels was 38 m. During retreat mining, serious bumps occurred in the gateroads on both sides of the pillar affecting safety production. Therefore, pillarless mining was experimented. Using numerical modeling and comparative study of cases of similar mining condition, it was decided to employ a 6 m wide pillar, rather than the previous 38 m wide pillar. Support system for the gateroads was designed and implemented. During gateroad development, pillar failure conditions and entry deformation were monitored. Hydraulic fracturing method was employed to cut off the K3 sandstone along the entry rib so as to reduce the abutment pressure induced during retreat mining. Support reinforcement method combining grouting and advanced reinforcement methods was proposed to insure stable gateroad ahead of mining. Methane drainage and nitrogen injection were implemented to eliminate hazards associated with mine fire and spontaneous combustion. Since the development of gateroad has just completed, and retreat mining has not begun, the effectiveness of the proposed methods is unknown at this point. However, monitoring will continue until after mining. The results will be published in a separate paper. (C) 2015 Published by Elsevier B.V. on behalf of China University of Mining & Technology.
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