采矿与安全工程学报 ›› 2014, Vol. 31 ›› Issue (4): 580-586.

• 论文 • 上一篇    下一篇

深井大采高工作面沿空掘巷窄煤柱宽度研究

  

  1. 中国矿业大学(北京)资源与安全工程学院,北京 100083
  • 出版日期:2014-07-15 发布日期:2014-08-28
  • 作者简介:冯吉成(1985—),男,黑龙江省牡丹江市人,博士生,从事巷道围岩控制方面的研究。 E-mail:389832929@qq.com Tel:15210567563
  • 基金资助:

    国家自然科学基金项目(51234005,51204187)

Width of narrow coal pillar of roadway driving along goaf at large height mining face in deep mine

  • Online:2014-07-15 Published:2014-08-28

摘要: 为解决深井大采高工作面留设大煤柱导致回收率低的难题,运用理论计算、数值分析及现场工程实测的方法,研究了深井大采高工作面开采条件下不同煤柱宽度时煤柱两侧塑性区分布和采掘扰动对巷道变形的影响,得到窄煤柱的合理尺寸。结果表明:确定合理煤柱尺寸时应充分考虑煤柱自身稳定性和采掘影响下巷道围岩变形量;掘进期间沿空掘5~6 m宽煤柱时破碎严重,煤柱宽度至少7 m才能达到自身稳定要求,而回采期间煤柱宽度至少需8 m,此时巷道围岩变形量相对较小,综合确定煤柱宽度8 m为最优方案。现场监测表明:11030工作面进风平巷两帮最大变形量为1 210 mm,顶底板最大变形量为620 mm,能够满足安全生产要求。

关键词: 深井, 大采高, 沿空掘巷, 窄煤柱, 塑性区, 数值模拟

Abstract: In order to solve the problem of low recovery of wide coal pillar at large height mining face in deep mine, the effect of plastic area distributions of the two sides of coal pillar and driving disturbance on the roadway deformation under conditions of different width of narrow coal pillar when mining at large height mining face in deep mine have been studied by theoretical calculation, numerical analysis and site engineering measurement. Thus the reasonable width of narrow coal pillar is determined. The results show that the stability of coal pillar and the deformation of roadway surrounding rock affected by driving should be taken into consideration to determine the reasonable width of coal pillar. The coal pillar is seriously crushed when its width of roadway driving along goaf is 5 to 6 m while driving, but it can achieve stability when its width is not less than 7 m. The width needs no less than 8 m while mining, and consequently the deformation of floor and coal pillar is less severe. So it is the optimal decision when the width of coal pillar is 8 m. field monitoring indicates that,the maximum deformation of the two sides of intake airflow roadway in 11030 workface is 1 210 mm, and that of roof and floor is 620 mm, which can meet the requirements of safety production.

Key words: deep mine, large mining height, roadway driving along goaf, narrow coal pillar, plastic zone, numerical simulation