煤炭工程 ›› 2015, Vol. 47 ›› Issue (10): 80-82.doi: 10.11799/ce201510026

• 研究探讨 • 上一篇    下一篇

“锁砂”条件下的矿柱尺寸留设研究

钱坤1,丁自伟2,张杰3   

  1. 1. 中国矿业大学(北京)
    2. 西安科技大学
    3. 西安科技大学能源学院
  • 收稿日期:2014-10-25 修回日期:2014-11-12 出版日期:2015-10-12 发布日期:2015-10-19
  • 通讯作者: 钱坤 E-mail:ming123@163.com

Analysis of Pillar Design for Locked Sand Condition

  • Received:2014-10-25 Revised:2014-11-12 Online:2015-10-12 Published:2015-10-19

摘要: 针对“锁砂”条件下矿井开采矿柱留设理论的缺乏造成的矿柱尺寸留设不合理这一问题,基于内摩擦角对于矿柱强度具有显著的影响,通过分析Wilson两区约束理论的问题与不足,修正了其关于塑性区宽度和矿柱强度的计算公式,并在Pattison矿进行了现场应用,结果表明,Pattison矿所留矿柱的塑性区宽度为0.2m,矿柱的强度为7.4×109N,而矿柱所承受的载荷为6.8×108N,说明矿柱的尺寸仍有可以减小的空间。

关键词: 锁砂, 内摩擦角, 围压, 塑性区, 矿柱强度

Abstract: Locked sand mined in Pattison mine has very unique properties: very high friction angle and very low cohesion. Wilson theory on pillar design takes properties of pillar material into consideration. Analysis shows that friction angle has great effect on strength of pillar. Based on the analysis of problems of Wilson theory, improvements are made on the calculation of yield zone width and the load which pillar can take. Results calculated with parameters of Pattison mine show that the width of yield zone is 0.2m, the load which pillar can take is 7.4×109 N, while the load which pillar will take is 6.8×108 N. This means that the size of pillar still has a room to be minimized in order to raise the extraction ratio.

Key words: Locked sand, Friction angle, Confining pressure, Yield zone, Pillar strength

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