■■■■■■■■■■■■■■■■采矿与井巷工程中间岩层和节理弱面厚度对上行开采的影响*经来旺1,彭绍驰2,李树文2,李学帅2,经纬2(1.安徽理工大学力学与光电物理学院,安徽淮南232001;2.安徽理工大学土木建筑学院,安徽淮南232001)摘要:为了探究中间岩层厚度和节理弱面厚度对上行开采的影响,以甘肃平凉某矿为背景,利用块状离散元软件3DEC对中间岩层厚度比值为5.5、6.5、7.5、8.5、9.5以及节理弱面厚度从0至布满中间岩层的模型进行分析,得到了模型在不同中间岩层厚度比值以及不同节理弱面厚度下的塑性区分布图,同时得到了煤层1在不同工况下的下沉量。结果表明:随着中间岩层厚度比值的增加,煤层1在稳定区的下沉量分别减小了18.11%、24.48%、33.06%、42.09%,这意味着更厚的中间岩层有着更小的上部煤层变形和更大的下部煤层开采长度;同时,随着节理弱面厚度的增加,煤层1下部和上部岩层先后经过煤层1下部岩层未完全屈服;煤层1下部岩层屈服,但煤层1上部岩层尚未屈服;煤层1上、下岩层均屈服且发生离层的3个阶段,使得煤层1的下沉量发生2次突变,并先以较缓的趋势线性增加,随后以较快的趋势线性增加,最终演化为非线性变化趋势。关键词:煤层间距;节理弱面;上行开采;采空区模拟;3DEC中图分类号:TD822文献标志码:A文章编号:1008-8725(2023)02-001-04InfluenceofThicknessofIntermediateRockStratumandThicknessofWeakJointSurfaceonUpwardMiningJINGLaiwang1,PENGShaochi2,LIShuwen2,LIXueshuai2,JINGWei2(1.SchoolofMechanicalandPhotoelectricPhysics,AnhuiUniversityofScienceandTechnology,Huainan232001,China;2.SchoolofCivilEngineeringandArchitecture,AnhuiUniversityofScienceandTechnology,Huainan232001,China)Abstract:Inordertoexploretheinfluenceofthethicknessofintermediaterockstratumandthethicknessofweakjointsurfaceonupwardmining,takingamineinPingliang,Gansuprovinceasthebackground,theblockdiscreteelementsoftwarewasusedtoanalyzethemodel.Thethicknessratioofintermediaterockstratuminthemodelis5.5,6.5,7.5,8.5and9.5,andthethicknessofweakjointsurfaceisfromzerotofullofintermediaterockstratum,theplasticzonedistributionofthemodelunderdifferentthicknessratiosofintermediatestrataanddifferentthicknessofweakjointsurfaceswereobtained,atthesametime,thesubsidenceofcoals...