摘要:
针对下伏运输大巷长期受孤岛工作面应力集中影响破坏严重现状,对孤岛工作面进行回 收处理,从而减小其对巷道围岩应力集中的影响。 采用数值模拟方法,对比分析孤岛工作面回采 前后顶底板应力传递规律,探讨孤岛工作面顶板支承压力规律、下伏运输大巷与孤岛工作面底板 垂直距离不同时底板应力变化规律。 研究发现:随着下伏巷道距离底板距离的增大,巷道围岩应 力集中程度呈现减小的趋势;工作面回采后底板应力明显得以释放,底板巷道围岩应力集中系数 减小52% ~60% ;底板巷道围岩剪切破坏呈现X形破坏。 研究结果为后续巷道围岩支护优化提 供了理论依据。
Abstract:
Aimingattheseriousdamagecausedbythestressconcentrationintheisolatedworkingface foralongtimeintheundergroundtransportationroadway,theminingtreatmentoftheisolatedworking faceiscarriedouttoreduceitsinfluenceonthestressconcentrationofthesurroundingrockoftheroadway.Thispapercomparesandanalyzesthestresstransferlawofroofandfloorofisolatedworkingface beforeandaftermining,andprobesintothelawofroofsupportingpressureofisolatedworkingfaceand theverticaldistancebetweenunderlyingtransportationroadwayandisolatedworkingfacefloorbynumericalsimulation.Itfoundthatwiththeincreaseofthedistancefromthefloortothefloor,thestress concentrationofthesurroundingrockoftheroadwayshowsadecreasingtrend.Whentheisolatedisland faceismined,thestressofthefloorisobviouslyreleased.Thestressconcentrationfactorofsurrounding rockoffloorroadwayisreducedby52% ~ 60%,andtheshearfailureofsurroundingrockoffloor
roadwaypresentsX failure,which providestheoretical basisfor the optimization of surrounding rock supportinsubsequentroadway.
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