孤岛工作面末采时期上覆岩层失稳机理及停采工艺实践*郭靖1,2,3,张彪2,吕帅康1,尉永邦3,陈建如3,李建伟1(1.中国矿业大学(北京),北京100000;2.兖煤菏泽能化有限公司赵楼煤矿,山东菏泽274000;3.晋能控股煤业集团,山西大同037300)摘要:为研究孤岛工作面末采时期上覆岩层失稳机理及控制技术,以塔山煤矿山4#8310孤岛工作面开采为研究地质背景,根据分析得到孤岛工作面全生命周期上覆岩层应力集中应力叠加形式,导致停采撤架期间上覆岩层裂隙发育演化特征相似于工作面的周期来压时上覆岩层裂隙发育规律。同时结合现场实测数据及力学模型演算结果,推算出采位停止位置需至少保留煤柱16.18m,设定停采位置最终优化为1005m。利用分析得出的停采期间围岩应力变化规律,对撤退主通道机道顶板进行补强支护,优化停采支护工艺。现场顶板窥视孔影像表明,撤架时期机道顶板变形发生在可控范围内,上覆岩层变形得到了较好的控制,保证了坚硬顶板孤岛工作面停采撤架工作安全高效的完成。关键词:孤岛工作面;上覆岩层失稳机理;停采工艺中图分类号:TD323;TD353文献标志码:A文章编号:1008-8725(2023)02-009-05InstabilityMechanismandStoppageTechnologyPracticeofOverlyingStrataattheEndofIsolatedWorkingFacewithHardRoofGUOJing1,2,3,ZHANGBiao2,LYUShuaikang1,YUYongbang3,CHENJianru3,LIJianwei1(1.ChinaUniversityofMiningandTechnology-Beijing,Beijing100000,China;2.ZhaolouCoalMine,YanmeiHezeChemicalCo.,Ltd.,Heze274000,China;3.JinengHoldingCoalIndustryGroup,Datong037300,China)Abstract:Inordertostudythemechanismofoverburdenrockdestabilizationandcontroltechnologyduringthelastminingperiodoftheisolatedworkingface,thegeologicalbackgroundofthestudywastakenasTashancoalminemountain4-8310isolatedworkingface,accordingtotheanalysis,thestressconcentrationandstresssuperpositionoftheoverburdenrocklayerduringthewholelifecycleoftheisolatedworkingfacewasobtained,resultingintheoverburdenrocklayerfracturedevelopmentandevolutioncharacteristicssimilartotheoverburdenrocklayerfracturedevelopmentlawwhentheworkingfacecomesunderpressureinthecycle.Atthesametime,combinedwiththefieldmeasurementdataandmechanicalmodelcalculationresults,deducedthattheminingstoppingpositionneedstoretainat...