State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan
Ejin Horo Banner Mengtai Coal Co Ltd, Ordos

随着煤炭开采深度的增加,采动巷道大变形、难支护、反复修复等问题较为突出。针对深部厚煤层采动巷道支护难题,采用钻孔成像仪探测深部厚煤层采动巷道围岩松动破碎区分布特征及范围,采动巷道松动破碎范围约为2.8~3.7m,属于大松动圈不稳定围岩。开展深部厚煤层采动应力分布规律及巷道失稳特征相似材料模型试验与FLAC3D数值模拟分析,揭示工作面回采时采动应力传递规律及采动巷道围岩变形场、应力场与塑性区的分布特征,确定深部厚煤层工作面停采线距离巷道约50m,以降低采动应力对煤层底板巷道稳定性的影响。基于理论分析及支护结构承载特性模型试验等,提出深部厚煤层采动巷道锚网索注梯级支护技术,并成功应用于郭屯煤矿-808m水平进风大巷支护工程实践。现场矿压监测结果表明,采动巷道围岩变形持续约60d后趋于稳定,围岩顶板最大下沉量为71~75mm、底板最大鼓起量为63~69mm、帮部最大内挤量为94~118mm,未发生冒顶与片帮等事故,取得良好的支护效果。

With the increase of coal mining depth, the problems of large deformation, supporting diffi-culties, and repeated repairing of mining roadway are prominent. An investigation of loose-broken zonesof surrounding rock in mining roadway was conducted using borehole scopes to assess the supportingproblem of deep-thick coal seams, the loose-broken range of the mining roadway was 2.8 - 3.7 m,which belonged to a large loose circle with unstable surrounding rock. The similar material modelling testand the FLAC 3D numerical simulation analysis were carried out to investigate the mining stressdistribution law and roadway instability characteristics in deep-thick coal seam. The transfer law of themining-induced stress, the deformation field of surrounding rock, and the stress field and plastic zone ofmining roadway were revealed. The stopping line of the working face in the deep coal seam was about 50meters away from the roadway, allowing the mining-induced stress to reduce its effects on the roadwaystability beneath the coal seam. As a result of theoretical analysis and model testing on the bearing char-acteristics of the supporting structure, a bolt-mesh-cable-grouting progressive support system was devel-oped to support mining roadways in deep-thick coal seams, and it was successfully applied to the GuotunCoal Mine's main roadway with mining level of -808 meters. The mining pressure monitoring in thefield indicated that the deformation of surrounding rock tended to be stable after about 60 days. The max-imum subsidence of roof, the maximum floor heave, and the maximum rib-to-rib convergence were 71-75 mm, 63-69 mm, and 94-118 mm, respectively. There were no accidents, such as roof collapse orrib spalling, and good supporting effects were obtained.

国家重点研发计划项目(2021YFC2902103);国家自然科学基金项目(52074268,51704280,52104100);中国矿业大学煤炭精细勘探与智能开发全国重点实验室自主研究课题项目(SKLCRSM23X003)