Tulu Ihsan Berk, Esterhuizen Gabriel S, Klemetti Ted, Murphy Michael M, Sumner James, Sloan Michael
Ground Control Branch NIOSH, Office of Mine Safety and Health Research Pittsburgh, PA 15216, USA.
Lone Mountain Processing Inc., St. Charles, VA 24282, USA.
Int J Min Sci Technol. 2016 Mar;26(2):193-198. doi: 10.1016/j.ijmst.2015.12.003.
In this paper, the advantage of using numerical models with the strength reduction method (SRM) to evaluate entry stability in complex multiple-seam conditions is demonstrated. A coal mine under variable topography from the Central Appalachian region is used as a case study. At this mine, unexpected roof conditions were encountered during development below previously mined panels. Stress mapping and observation of ground conditions were used to quantify the success of entry support systems in three room-and-pillar panels. Numerical model analyses were initially conducted to estimate the stresses induced by the multiple-seam mining at the locations of the affected entries. The SRM was used to quantify the stability factor of the supported roof of the entries at selected locations. The SRM-calculated stability factors were compared with observations made during the site visits, and the results demonstrate that the SRM adequately identifies the unexpected roof conditions in this complex case. It is concluded that the SRM can be used to effectively evaluate the likely success of roof supports and the stability condition of entries in coal mines.
本文展示了使用强度折减法（SRM）数值模型评估复杂多煤层条件下巷道稳定性的优势。以阿巴拉契亚中部地区一个地形多变的煤矿为例进行研究。在该煤矿，在先前开采的采空区下方进行开拓时遇到了意外的顶板条件。通过应力测绘和地面状况观测来量化三个房柱式采空区中巷道支护系统的成效。最初进行数值模型分析以估计多煤层开采在受影响巷道位置处引起的应力。采用强度折减法量化选定位置处巷道支护顶板的稳定系数。将强度折减法计算出的稳定系数与现场考察期间的观测结果进行比较，结果表明强度折减法能充分识别这一复杂情况下的意外顶板条件。得出的结论是，强度折减法可用于有效评估煤矿中巷道支护可能的成效以及巷道的稳定状况。
