Bijie Energy Bureau
Guizhou Yuxiang Mining Industry Group Investment Co., Ltd.

盛安煤矿6#煤层与其下伏9#煤层平均间距6.23m,6#煤层开采后,9#煤层工作面巷道掘进期间顶板破碎、下沉明显,现有锚网支护方式已满足不了安全生产需求。采用FLAC3D数值模拟、经验公式计算及现场钻孔窥视仪实测等技术,综合研究了6#煤层开采后底板岩层破坏特征,确定了6#煤层底板塑性破坏深度可达8.5~9.3m,提出了采用锚网+锚索+工字钢棚加强9#煤层巷道掘进期间顶板控制的协同支护技术,并模拟了滞后迎头不同距离时架设工字钢棚条件顶板的下沉量,确定了紧跟迎头架设工字钢棚的协同支护方案,确保了9#煤层安全回采。

The average row spacing between the 6 coal seam and its underlying 9 coal seam is 6.23 m in Sheng'an Coal Mine. After the mining of the 6 coal seam, the roof is broken and sinks significantly of the 9 coal seam working face during the roadway excavation period. The existing anchor net support method can no longer meet the safety production needs. Technologies of FLAC numerical simulation, empirical formula calculation, on-site drilling peeping instrument actual measurement and others are adopted to comprehensively study the failure characteristics of the floor rock layer after the mining of the 6 coal seam. It is determined that the plastic failure depth of the 6 coal seam floor can reach 8.5-9.3 m. A collaborative support technology of adopting anchor net+anchor cable+I-beam steel shed is proposed to strengthen the roof control during the roadway excavation period of the 9 coal seam. The subsidence amount of the roof under the condition of erecting I-beam steel shed with different distances of lagging head-on is simulated, and the collaborative support scheme of erecting I-beam steel shed closely following the head-on is determined. The safe stoping of the 9 coal seam is ensured.