Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (6): 886-890.DOI: 10.12068/j.issn.1005-3026.2019.06.023

• Resources & Civil Engineering • Previous Articles     Next Articles

Quantitative Characterization of Microstructure of Gas-bearing Coal in Tunlan Mining Area

LI Jiang-tao, LIANG Wen-xu, HE Zhi-hong   

  1. 1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China; 2. Shenyang Research Institute, China Coal Technology and Engineering Group, Shenyang 110016, China; 3. State Key Laboratory of Coal Mine Safety Technology, Fushun 113122, China; 4. Xishan Electricity Group Co. Ltd., Taiyuan 030000, China.
  • Received:2018-05-09 Revised:2018-05-09 Online:2019-06-15 Published:2019-06-14
  • Contact: LI Jiang-tao
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Abstract: In order to reveal the significance of gas-bearing coal to gas migration, XRD quantitative characterization was carried out on 7 coal samples with different burial depths in Taiyuan Formation of Tunlan Mining Area, and the structural parameters of coal microcrystals were calculated by combining Bragg equation. The results show that with the increase of coalification, the asymmetry of peak(002)gradually decreases, while the corresponding extension length(La)and stacking height(Lc)gradually increase while the interval between layers(d002)decreases. Combined with the mathematical model of coal per unit volume, it is found that there is a significant correlation between permeability coefficient, porosity and ordered phase volume coal. Furthermore, it is proposed that the potential of gas outburst in deep coal seam in Tunlan mining area is higher than that in shallow coal seam, so it is necessary to strengthen the prevention of gas outburst in deep coal seam.

Key words: gas-bearing coal, microstructure, quantitative characterization, Tunlan mining area

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