Long-term stability evaluation and coal pillar design methods for strip mining

被引：0
|
作者：
Yu Y. [1 ]
Deng K. [1 ]
Fan H. [1 ]
机构：
[1] School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou
来源：
Meitan Xuebao/Journal of the China Coal Society | 2017年 / 42卷 / 12期
关键词：
Coal pillar; Long-term stability; Pillar design; Strip mining;
D O I：
10.13225/j.cnki.jccs.2017.0645
中图分类号：
学科分类号：
摘要：
The coal pillar will peel and scale down under the effects of underground water, weathering, etc., leading a progressive pillar failure. Based on the progressive peeling behaviors of coal pillar and properties of peeled coal deposit, this paper established a non-evenly peeling pillar model; the factors affecting pillar peeling and the relationship between pillar peeling and safety factor had been analyzed; a long-term stability evaluation method for strip pillars had been proposed; finally, the synergic relationships among recovery ratio, subsidence control and safety factor has been discussed. Analysis results shows that the pillar peeling is affected by bulk factor of coal, angle of repose and width-height ratio of mining tunnel, and the degree of pillar peeling can be determined by peeling angle. The increase of pillar width-height ratio can reduce the effects of peeling angle on pillar stability. This model can be utilized in long-term failure risk evaluation for strip pillars. © 2017, Editorial Office of Journal of China Coal Society. All right reserved.
引用
收藏
页码：3089 / 3095
页数：6
相关论文
共 22 条
  • [1] Bai M., Liu T., Study on pillar size and mining width for partial mining, Journal of China Coal Society, 4, pp. 19-26, (1983)
  • [2] Guo G., Wang Y., Ma Z., A new method for ground subsidence control in coal mining, Journal of China University of Mining & Technology, 33, 2, pp. 150-153, (2004)
  • [3] Guo W., Wang H., Liu Z., Coal pillar stability and surface movement characteristics of deep wide strip pillar mining, Journal of Mining & Safety Engineering, 32, 3, pp. 369-375, (2015)
  • [4] Guo W., Surface movement predicting problems of deep strip pillar mining, Journal of China Coal Society, 33, 4, pp. 368-372, (2008)
  • [5] Liu G., Zhang H., Xu N., Coal pillar stability of deep and high seam strip-partial mining, Journal of China Coal Society, 33, 10, pp. 1086-1091, (2008)
  • [6] Tan Y., Guo W., Zhao Y., Engineering stability and instability mechanism of strip Wongawilli coal pillar system based on catastrophic theory, Journal of China Coal Society, 41, 7, pp. 1667-1674, (2016)
  • [7] Wang X., Huang F., Zhang H., Et al., Discussion and improvement for A. H. Wilson coal pillar design, Journal of China Coal Society, 27, 6, pp. 604-608, (2002)
  • [8] Merwe J.N.V.D., Predicting coal pillar life in South Africa, The Journal of The South African Institute of Mining and Metallurgy, 103, 5, pp. 293-301, (2003)
  • [9] Merwe J.N.V.D., Mathey M., Update of coal pillar database for South African coal mining, The Journal of The South African Institude of Mining and Metallurgy, 113, 11, pp. 825-840, (2013)
  • [10] Salamon M.D., Ozbay M.U., Madden B.J., Life and design of bord-and-pillar workings affected by pillar scaling, The Journal of the South African Institute of Mining and Metallurgy, 98, 3, pp. 135-145, (1998)
123