采矿与安全工程学报 ›› 2016, Vol. 33 ›› Issue (3): 398-402.

• 论文 • 上一篇    下一篇

上覆煤层开采后下伏煤层卸压机理分析

  

  1. 中国矿业大学煤炭资源与安全开采国家重点实验室,矿业工程学院,江苏 徐州 221116
  • 收稿日期:2015-10-20 出版日期:2016-05-15 发布日期:2016-06-03
  • 作者简介:汪锋(1987—),男,安徽省潜山县人,博士研究生,从事岩层移动与绿色开采方面的研究。
  • 基金资助:

    国家“十二五”科技支撑计划项目(2012BAK04B06)

Pressure-relief mechanism of lower seam extraction after upper seam extraction

  • Received:2015-10-20 Online:2016-05-15 Published:2016-06-03

摘要: 以开滦唐山矿 Y485 工作面受上覆 5 # 煤层采空影响为背景,基于关键层理论,采用数值模拟和现场实测研究了上覆煤层开采后下伏煤层的卸压机理。结果表明:覆岩中往往存在多层关键层,会对工作面支承压力产生影响。卸压开采后上覆关键层发生破断,下伏煤层工作面回采时仅在层间关键层的影响下支承压力的影响范围和峰值显著降低。唐山矿上覆 5 # 煤层工作面回采后,仅在层间关键层的影响下,下伏 9 # 煤层 Y485 工作面超前支承压力影响范围由 73 m 减小至 38 m,超前支承压力峰值与工作面煤壁的距离由 29 m 减小至 20.5 m。当两煤层间存在厚硬关键层时,开采上覆煤层对下伏煤层进行卸压时,下煤层工作面支承压力峰值的最大值是无关键层时的 2.34 倍,下煤层回采时仍产生了显著的应力集中。

关键词: 深部开采, 卸压开采, 关键层, 支承压力

Abstract: With the extraction influence coal seam 5 # on longwall panel Y485 in Kailuan Tangshan coal mine as research background and based on the key strata theory, the pressure-relief mechanism of lower seam extraction after the upper seam extraction has been studied through numerical model and field ob- servation.The results have shown that during mining, the distribution of abutment stress is influenced by the key strata in the overlying strata.The key strata were fractured due to pressure-relief mining, and the abutment stress was only influenced by the key strata between the two seams.Therefore, the influ- ence distance of the abutment stress and the distance between the peak abutment stress and the panel were decreased.Due to the extraction of seam 5 # in Tangshan coal mine, the abutment stress in panel Y485 located in seam 9 # was only influenced by the key strata between the two seams.The influence distance of the abutment stress in panel Y485 decreased from 73 m to 38 m, and the distance between the peak abutment stress and the panel decreased from 29 m to 20.5 m.When there is a hard-and-thick key stratum present between two seams, the peak abutment stress is 2.34 times as great as that without one and severe stress concentration is formed during the lower seam extraction after pressure-relief mining.

Key words: deep mining, pressure-relief mining, key strata, abutment stress