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- Title
A protective seam with nearly whole rock mining technology for controlling coal and gas outburst hazards: a case study.
- Authors
Sun, Qiang; Zhang, Jixiong; Zhang, Qiang; Yin, Wei; Germain, Deon
- Abstract
Coal seams with low gas permeability and high gas outburst hazards are becoming more serious as coal mines extend deeper, but there are no appropriate protective coal seams for this kind of coal seam in China. In this paper, mining technology using a protective seam with nearly whole rock (PSNWR) is used to improve gas drainage and ensure safety during production. The characteristics of the distribution and occurrence of PSNWRs and their mechanical properties are analyzed. A theoretical mechanics model and three-dimensional numerical model are established to study the controlling effect of PSNWR mining on pressure-relief gas drainage. In this context, the mining process, system and gas extraction design for PSNWRs are introduced. The results for Pingdingshan No. 12 Coal Mine show that mining with a PSNWR 2.0 m thick can effectively reduce the danger of coal and gas outbursts and improve gas drainage and utilization. The gas drainage rates are >80 %, which significantly increases the social, economic and environmental benefits of Pingdingshan No. 12 Coal Mine.
- Subjects
PERMEABILITY; ADSORPTION (Chemistry); COAL gasification; COAL products; FLAMMABLE gases
- Publication
Natural Hazards, 2016, Vol 84, Issue 3, p1793
- ISSN
0921-030X
- Publication type
Article
- DOI
10.1007/s11069-016-2512-9