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《Coal Science and Technology》 2014-12
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Determination on Effective Influence Radius of Gas Drainage Through Borehole Based on One-dimensional Radial Flow

LI Zi-wen;LIN Bai-quan;GUO Ming-gong;GAO Ya-bin;School of Safety Engineering,China University of Mining & Technology;State Key Laboratory of Coal Resources and Safe Mining;No. 8 Mine,Pingdingshan Tian'an Coal Mining Corporation Ltd.;  
In order to determine the effective influence radius of gas drainage through borehole quickly and accurately,the exponential relationship between drainage quantity of boreholes and drainage time was established based on the mathematical model of one- dimensional radial flow of gas. On the basis of the law of mass conservation and Darcy law,calculation formula of drainage radius was derived and mathematical relationship between drainage radius and coal seam parameters and drainage time was established. By using this method,drainage radius of Xinfeng Coal Mine No. 25021 Coal Mining Face was calculated. The calculation result was 2. 70 ~ 3. 72 m within 60 days and was similar to the site measurement. Meanwhile,the functional relationship between drainage radius and drainage time was researched. The results showed that with the increase of drainage time,the drainage radius increased gradually. When the drainage time reached to 60 days,the drainage radius reached to 96. 46% ~ 98. 54% of limit value. After that,the drainage radius increased very slowly.
【Fund】: 国家重点基础研究发展计划(973计划)资助项目(2011CB201205);; 国家自然科学基金资助项目(51074161)
【CateGory Index】: TD712.6
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