Energy accumulation characteristics and rockburst mechanism of surrounding rock at heading face of extra-thick coal seam

被引：0
|
作者：
Zhu S.-T. [1 ]
Jiang F.-X. [1 ]
Wang X.-Y. [2 ]
Jiang Y.-W. [2 ]
Ning T.-Z. [2 ]
Sun S.-H. [2 ]
机构：
[1] School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing
[2] Liuhuanggou Coal Mine, Yankuang Xinjiang Mining Co., Ltd., Changji
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2019年 / 41卷 / 11期
关键词：
Energy accumulation; Extra-thick coal; Heading face; Risk assessment; Rockburst;
D O I：
10.11779/CJGE201911012
中图分类号：
学科分类号：
摘要：
Taking the extra-thick coal seam heading face in Liuhuanggou Coal Mine as the engineering background, the energy accumulation characteristics and rockburst mechanism of the surrounding rock at heading face of extra-thick coal seam are studied using field investigation, expriment of rock mechanics and theoretical analysis. The following results are obtained: (1) According to the exprimental results of rock mechanics of 9-15 coal seam and rock in Liuhuanggou Coal Mine, when the burial depth is between 100 and 1000 m, the energy density of coal and rock is proportional to the burial depth, and the energy density ratio of coal to rock is between 1.8 and 2.3. (2) Under the same depth conditions, the elastic energy accumulation of the surrounding rock at heading face of extra-thick coal seam is much larger than that of thin and medium-thick coal seam, and the structure of the surrounding rock with high elastic energy accumulation is one of the reasons that the heading face of the extra-thick coal seam is more prone to rockburst. (3) The accumulated elastic energy of the surrounding rock is proportional to the thickness of coal seam and the radius of roadway within the influence range of tunneling. Under the same radius of roadway, the greater the thickness of coal seam, the greater the accumulated elastic energy of the surrounding rock. When the radius of roadway is 3.0 m, the accumulated elastic energy of the surrounding rock is 1.4 times and 2.0 times that of the roadway radius when it is 2.5 and 2.0 m. (4) An evaluation method for impact hazard considering thickness and impact tendency of coal seam is proposed. This method is more scientific and reasonable than the current evaluation method for impact hazard, and the evaluated results are more in line with the actual situations. The research results can be used for reference in the prevention and control of rockburst at the heading face of the extra-thick coal seam. © 2019, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：2071 / 2078
页数：7
相关论文
共 14 条
  • [1] Du T.-T., Li G.-Y., Chen J.-Q., Et al., Rock burst occurrence and prevention status in Xinjiang region, Coal Mining Technology, 23, 2, pp. 5-10, (2018)
  • [2] Du T.-T., Li K., Lan H., Et al., Rockburst process analysis in steeply-inclined extremely-thick coal seam, Journal of Mining & Safety Engineering, 35, 1, pp. 140-145, (2018)
  • [3] Lan H., Prevention measures and types of mine strata pressurebump occurred in shallow depth seam, Coal Science and Technology, 42, 1, pp. 9-13, (2014)
  • [4] Jiang F.-X., Wei Q.-D., Wang C.-W., Et al., Analysis of rock burst mechanism in extra-thick coal seam controlled by huge thick conglomerate and thrust fault, Journal of China Coal Society, 39, 7, pp. 1191-1196, (2014)
  • [5] Shi X.-F., Jiang F.-X., Zhu H.-Z., Et al., Research and practice on restoring production of rock burst accident working face in top slice during slice mining of extra-thick coal seams, Journal of China Coal Society, 40, pp. 19-26, (2015)
  • [6] Zhu S.-T., Mechanism and prevention of rockburst in extra-thick coal seams mining, (2017)
  • [7] Xu S.-M., Li S.-Y., Li D.-X., Et al., Geological laws of rock burst occurrence in Yima coalfield, Journal of China Coal Society, 40, 9, pp. 2015-2020, (2015)
  • [8] Lan H., Rock-burst mechanism and prevention in mining sub-erect and extremely-thick coal seam with horizontal slicing method, Journal of China Coal Society, 39, pp. 308-315, (2014)
  • [9] Lan H., Du T.-T., Monitoring and analysis of rock burst process during steeply inclined and ultra thick seam mining, Coal Science and Technology, 44, 6, pp. 78-82, (2016)
  • [10] Jiang F.-X., Wang P., Feng Z.-Q., Et al., Mechanism, prediction and control of "rock burst induced by shock bump" kind dynamic accident in composite thickness coal, Journal of China Coal Society, 34, 2, pp. 1605-1609, (2009)
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