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Title of Journal: Nat Hazards

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Abbravation: Natural Hazards

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Springer Netherlands

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DOI

10.1007/bf02846222

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1573-0840

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A protective seam with nearly whole rock mining te

Authors: Qiang Sun Jixiong Zhang Qiang Zhang Wei Yin Deon Germain
Publish Date: 2016/08/09
Volume: 84, Issue: 3, Pages: 1793-1806
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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 threedimensional numerical model are established to study the controlling effect of PSNWR mining on pressurerelief 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 20 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 MineThis work is supported by State Key Laboratory of Coal Resources and Safe Mining CUMT SKLCRSM13X01 Qing Lan Project Foundation of Jiangsu Province 2014 and National Key Basic Research Program of China 2013CB227905 The authors gratefully acknowledge the financial support from the organizations mentioned above

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