Study on the mining height evolution law of the dominant channel of gas migration in fully mechanized mining face

被引：0
|
作者：
Zhao P. [1 ,2 ]
Zhuo R. [1 ]
Li S. [1 ,2 ]
Xiao P. [1 ,2 ]
Lin H. [1 ,2 ]
Li G. [1 ]
机构：
[1] College of Safety Science and Engineering, Xi'an University of Science & Technology, Xi'an, 710054, Shaanxi
[2] Key Laboratory of Western Mine Exploitation and Hazard Prevention, Ministry of Education, Xi'an University of Science & Technology, Xi'an, 710054, Shaanxi
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 04期
关键词：
Dominant channel; High-level drilling; Mining height effect; Mining overlying strata fracture; Relief gas;
D O I：
10.13545/j.cnki.jmse.2019.04.026
中图分类号：
学科分类号：
摘要：
To research the laws of relief gas migration in overlying strata, based on the mining crack ellipsoid theory, the space morphological mode of excellent mining gas channel in mining height effect has been constructed. For the main mining face of a high gas mine in Heshun, Shanxi, the physical similarity simulation method is used to reveal the mining control mechanism of the dominant channel of the fully mechanized mining face. Based on this, the high-level drilling and unloading gas test has been car- ried out on site. The results have shown that in the overlying strata, the amount of separation from the left and right boundaries of the dominant channel is significantly changed. With the increase of mining height, the height of the dominant channel develops to 29.5 m, 48 m, 60 m from the bottom of the coal seam, and the width changes from 28 m to 33 m. When the peak of the separation rate is moved from 30 m to 60 m from the bottom of the coal seam, the penetration will obviously increase. When the peak of the separation rate is moved from 30 m to 60 m from the bottom of the coal seam, the penetration will obviously increase. Fractal dimension of excellent channels of 6 m mining height is 1.07 times and 1.23 times higher than that of 4 m and 2 m, showing a rise dimensional trend. In the high-level drilling test in the field, the high-level drilling parameters of the working face with different heights are optimized and adjusted, and the high-drilling gas extraction gas accounts for 49.94%~89.88% of the total gas emission. Moreover, the average gas concentration of the upper corner and the return air passage is maintained below 0.27% and below 0.32%, thereby ensuring safe and efficient recovery of the working face. The results of the study provide a theoretical basis for the identification of the gas enrichment zone. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：848 / 856
页数：8
相关论文
共 28 条
  • [1] Cheng Y., Fu J., Yu Q., Development of gas extraction technology in coal mines of China, Journal of Mining & Safety Engineering, 26, 2, pp. 127-139, (2009)
  • [2] Cheng Y., Yu Q., Yuan L., Et al., Experimental research of safe and high-efficient exploitation of coal and pressure relief gas in long distance, Journal of China University of Mining & Technology, 33, 2, pp. 132-136, (2004)
  • [3] Guo H., Adhikary D.P., Craig M.S., Simulation of mine water inflow and gas emission during long wall mining, Rock Mechanics & Rock Engineering, 42, 1, pp. 25-51, (2009)
  • [4] Lin H., Li S., Cheng L., Et al., Experimental analysis of dynamic evolution model of mining-induced fissure zone in overlying strata, Journal of Mining & Safety Engineering, 28, 2, pp. 298-303, (2011)
  • [5] Gu H., Wang W., Wang L., Influence of overlying strata movement of fully mechanized top coal caving face on gas migration in adjacent seams, Coal Engineering, 48, 3, pp. 61-63, (2016)
  • [6] Qian M., Xu J., Overburden fracture distribution of the "O" shape of circle features, Journal of China Coal Society, 23, 5, pp. 466-469, (1998)
  • [7] Xu J., Qian M., Experimental study on the relief of coalbed methane in a long distance from ground drilling, Journal of China University of Mining & Technology, 29, 1, pp. 78-81, (2000)
  • [8] Xu J., Meng G., Application of overlying strata of mining fissure "O" ring characteristics of drainage of goaf gas, Coal Mine Safety, 26, 7, pp. 2-4, (1995)
  • [9] Ye J., Liu Z., Study on the application of gas extraction from goaf in roof roadway, Journal of Huainan Industrial Institute, 19, 2, pp. 32-36, (1999)
  • [10] Liu Z., Yuan L., Dai G., Et al., Study on fracture characteristics of overlying strata and their application in gas drainage, Journal of Anhui University of Science and Technology, 32, 4, pp. 10-15, (2004)
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