第18卷增刊2地下空间与工程学报Vol.182022年12月ChineseJournalofUndergroundSpaceandEngineeringDec.2022基于CDEM方法的小间距巷道中间岩柱稳定性分析王昱博,肖支飞,王安民,郑勇,仝跃(云南省交通规划设计研究院有限公司,昆明650011)摘要:中间岩柱的稳定性是影响小间距巷道施工成败的重要因素,基于连续离散耦合方法(CDEM),依托华北某煤矿深埋巷道工程,针对深埋小间距巷道开挖过程中对中间岩柱所产生的应力重分布机制及空间位移变形规律进行研究,以确定合理的巷道间距。结果表明:巷道间距小于等于1.0B时,岩柱应力集中效应显著,发生以拉伸破坏为主的拉剪破坏,同时岩柱的失稳破坏导致巷道以双洞联合模式塌落;巷道间距大于等于1.6B时,应力、位移和破损程度等指标及理论计算结果均显示在开挖完成后岩柱与巷道不会发生坍塌,处于较为稳定的状态。研究成果对小间距巷道的施工控制与事故预防具有一定的指导意义。关键词:小间距巷道;围岩稳定性;中间岩柱;连续离散耦合方法中图分类号:TU45文献标识码:A文章编号:1673-0836(2022)增2-0785-07StabilityResearchofMiddleRockPillarinSmallIntervalTunnelBasedonCDEMWangYubo,XiaoZhifei,WangAnmin,ZhengYong,TongYue(BroadvisionEngineeringConsultants,Kunming650011,P.R.China)Abstract:Thestabilityofthemiddlerockpillarisanimportantfactorthataffectsthesuccessorfailureofthesmallintervaltunnelconstruction.Basedoncoupledcontinuous-discreteelementmethod(CDEM)andrelyingonthesoftrocktunnelprojectofacoalmineinNorthChina,thearticlefocusesonthestressredistributionmechanismandthelawofspatialdisplacementanddeformationaboutthemiddlerockpillarduringtheexcavationofthedeep-buriedsmallintervaltunnel,whichareusedtodeterminedthereasonabledistancebetweentunnels.Theresultsshowthatwhenthetunnelspacingislessthanorequalto1.0B,therockpillarstressconcentrationeffectissignificant,tensile-shearfailuredominatedbytensilefailureoccurs,andtheinstabilityfailureoftherockpillarcausesthetunneltocollapseinadual-cavitycombinedmode.Whenthetunnelspacingisgreaterthanorequalto1.6B,theindicatorssuchasstress,displacementanddamagedegreeandtheoreticalcalculationresultsallshowthattherockpillarandtunnelwillnotcollapseaftertheexcavationiscompleted,andtheyareinarelative...
