Shandong Energy Zaozhuang Mining Group Sanhekou Mining Co.,Ltd.
Hebei Key Laboratory of Mine Disaster Control,North China Institute of Science and Technology

为研究上位煤层采空后遗留边界煤柱对下位煤层巷道布置影响。本文采用数值模拟、理论分析和现场观测等方法对下位煤层巷道围岩应力分布、支护方案进行研究。研究结果表明:下位煤层巷道掘进后,在上位煤柱垂直集中应力作用下,两帮围岩出现明显应力集中区,峰值应力约为2.4倍原岩应力,围岩变形量较大;锚网索联合支护方案适用于受煤柱影响下的下位煤层巷道围岩,围岩整体变形明显减小,支护效果良好。研究结果对近距离煤层开采支护设计具有较好的指导意义。

To study the impact of residual boundary coal pillars on the layout of lower coal seam tunnels aftergoaf extraction in the upper coal seam.In this paper,numerical simulation,theoretical analysis and field observation are used to study the stress distribution and support scheme of surrounding rock in lower coal seam roadway.The research results show that after the excavation of the lower coal seam roadway,under the vertical concentrated stress of the upper coal pillar,there are obvious stress concentration areas in the surrounding rock ofthe two sides,with a peak stress of about 2.4 times the original rock stress,and a large deformation of the surrounding rock;The anchor mesh cable combined support scheme is suitable for the surrounding rock of the lower coal seam roadway under the influence of coal pillars.The overall deformation of the surrounding rock issignificantly reduced,and the support effect is good.The research results have good guiding significance for thedesign of support for close range coal seam mining.

河北省自然科学基金(E2021508008);中国科协青年人才托举工程项目(No.YESS20210414);国家自然科学基金资助项目(51804119)