切顶卸压切缝参数设计与巷道围岩应力演化规律研究王柯童，弓培林，赵通（太原理工大学矿业工程学院，太原030024）摘要：针对强采动影响下切顶卸压护巷效果不佳的问题，以长平煤矿5302回风顺槽预裂爆破切顶卸压为工程背景，利用3DEC离散元数值模拟软件，生成不同曲率半径的切缝，对其护巷效果与巷道围岩应力演化规律进行研究，并将切缝为曲率半径16m的模拟结果与切缝为直线的模拟结果进行对比。结果表明，相较于直线切缝，当切缝为曲线时，顶板下沉量与底鼓量分别减小了30.9%和28.57%，实体煤帮与煤柱帮变形量分别减小了45.03%与28.6%,实体煤帮与煤柱帮垂直应力峰值分别减小了24.88%与24.47%。当切缝为曲率半径16m的曲线时，巷道上覆岩层垮落堆积的岩体能够与煤柱形成较好的承载体系，有效地切断了采空区上覆岩层与巷道顶板之间的力学联系，改善了巷道的围岩力学环境。关键词：强采动；切顶卸压；应力演化；切缝；曲率半径中图分类号：TD322文献标志码：A文章编号：1008－8725（2023）03－059－05ResearchonParameterDesignofRoofPressureReliefSlitandStressEvolutionLawofRoadwaySurroundingRockWANGKetong,GONGPeilin,ZHAOTong(CollegeofMiningEngineeing，TaiyuanUniversityofTechnology，Taiyuan030024，China)Abstract：Aimingattheproblemofpoorpressurereliefeffectofroadwayprotectionundertheinfluenceofstrongmining,takingtheroofpressurereliefeffectofpre-splitblastingfor5302returnairpassageinChangpingcoalmineastheengineeringbackground,3DECdiscreteelementnumericalsimulationsoftwarewasusedtogenerateslitwithdifferentradiusofcurvature,andtheroadwayprotectioneffectandsurroundingrockstressevolutionlawwerestudied.Thesimulationresultswithacurvatureradiusof16marecomparedwiththosewithastraightline.Theresultsshowthatwhentheseamiscurved,theroofsubsidenceandfloorheavearereducedby30.9%and28.57%respectively,thedeformationofsolidseamandpillarseamarereducedby45.03%and28.6%respectively,andtheverticalstresspeakvalueofsolidseamandpillarseamisreducedby24.88%and24.47%respectively.Whenthecuttingseamisacurvewithcurvatureradiusof16m,therockmassaccumulatedbyoverburdenstratacanformabetterbearingsystemwithcoalpillar,effectivelycuttingthemechanicalconnectionbetweenoverburdenstrataingo...
