By a News Reporter-Staff News Editor at Journal of Mathematics -- Researchers detail new data in Numerical Modeling. According to news reporting out of Jiangsu, People’s Republic of China, by VerticalNews editors, research stated, “Many researchers have concluded that the permeability evolution of coal and rock is closely related to the stress change path. However, in the protective coal seam mining practices, the stress change path of the overlying coal seams is ignored, per the related technical criterion and regulations, the traditional permeability-increasing area in the overlying protected coal seam is generally delimited smaller than the mined-out area of the protective coal seam, which wastes a large quantity of coal resources.”
Financial supporters for this research include Fundamental Research Funds for the Central Universities, Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
Our news journalists obtained a quote from the research from the China University of Mining and Technology, “This study investigates the actual permeability-increasing area of the overlying protected coal seam through theories analysis, FLAC(3D) numerical simulation and field test. The permeability distribution of the overlying protected coal seam near the mined-out boundary in the strike direction (MBSD) is quantitatively divided into four zones, which are the original permeability zone, permeability decrease zone, permeability insufficient increase zone, and permeability sufficient increase zone. It is suggested that the actual permeability-increasing area is larger than the mined-out area of the protected coal seam. According the permeability distribution of the protected coal seam, optimized cross-measure boreholes were designs for gas drainage. The field tests showed that the outburst risk of the protected coal seam inside the MBSD was eliminated two months after the protective coal seam mining.”
According to the news editors, the research concluded: “The theories analysis, numerical simulation and field tests showed that the actual permeability-increasing area is larger than the traditional permeability-increasing area, the protected area in the protected coal seam can be enlarged by the optimized cross-measure boreholes gas drainage.”
For more information on this research see: New insights into the permeability-increasing area of overlying coal seams disturbed by the mining of coal. Journal of Natural Gas Science and Engineering , 2018;49():352-364. Journal of Natural Gas Science and Engineering can be contacted at: Elsevier Sci Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, Oxon, England. (Elsevier - www.elsevier.com; Journal of Natural Gas Science and Engineering - http://www.journals.elsevier.com/journal-of-natural-gas-science-and-engineering/)
Our news journalists report that additional information may be obtained by contacting R. Zhang, China Univ Min & Technol, Natl Engn Res Center Coal & Gas Control, Xuzhou 221116, Jiangsu, People’s Republic of China. Additional authors for this research include Y.P. Cheng, H.X. Zhou, L. Yuan, W. Li, Q.Q. Liu, K. Jin and Q.Y. Tu.
The direct object identifier (DOI) for that additional information is: https://doi.org/10.1016/j.jngse.2017.11.031. This DOI is a link to an online electronic document that is either free or for purchase, and can be your direct source for a journal article and its citation.
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CITATION: (2018-01-16), Reports from China University of Mining and Technology Provide New Insights into Numerical Modeling (New insights into the permeability-increasing area of overlying coal seams disturbed by the mining of coal), Journal of Mathematics, 392, ISSN: 1945-8746, BUTTER® ID: 015006935
From the newsletter Journal of Mathematics.
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