《河南水利与南水北调》2023年第2期试验与研究不同层理倾角下引水隧洞围岩受力机制研究周洋(清远市水利水电勘测设计院有限公司,广东清远511500)摘要:为研究不同角度下层状节理围岩的受力情况,从而合理地制定相应地支护措施,保证地下工程安全地、经济地施工。采用三维离散元软件,分别模拟了不同节理倾角下引水隧洞开挖过程中围岩的应力场,并进行了分析,得到了如下结论:①在埋深相同的情况下围岩层理倾角对隧道变形的影响显著。②在节理倾角为30°与60°时,隧道围岩的横向变形较小,但围岩受扰动区域的面积较大,且受扰动区域主要集中在隧道的右拱肩处。③围岩受拉区面积随围岩层理倾角增加而减小,当层理倾角为90°时,开挖平衡之后,隧道围压受拉区域的面积最小。④当围岩节理倾角为30°与60°时,围岩存在显著的偏压现象,从而导致地下工程在开挖过程中发生严重失稳现象。关键词:隧洞;围岩稳定性;离散元;层状围岩;应力场中图分类号:TV21文献标识码:A文章编号:1673-8853(2023)02-0088-02StudyonStressMechanismofSurroundingRockofDiversionTunnelunderDifferentStratifiedJointAnglesZHOUYang(QingyuanWaterResourcesandHydropowerSurveyandDesignInstitute,Qingyuan511500,China)Abstract:Thestressconditionofsurroundingrockwithdifferentanglesofsubstratumjointsisstudied,sothatthecorrespondingsupportmeasurescanbereasonablyformulatedtoensurethesafeandeconomicalconstructionofundergroundengineering.Inthispaper,three-dimensionaldiscreteelementsoftwareisusedtosimulatethestressfieldofsurroundingrockduringtunnelexcavationunderdifferentstratifiedjointangles.Theanalysisiscarriedout.Thefollowingfourconclusionsaredrawnasfollow.First,underthesameburieddepth,theangleofsurroundingrockhasasignificanteffectonthetunneldeformation.Second,whenthestratifiedjointangleis30°and60°,thetransversedeformationoftunnelsurroundingrockissmall,whilethedisturbedareaofsurroundingrockislarge,andthedisturbedareaismainlyconcentratedattherightspandrelofthetunnel.Third,theareaofsurroundingrocktensionzonedecreaseswiththeincreaseofthesurroundingrockbeddipangle.Whentheangleis90°,theareaoftunnelconfiningpressuretensionzoneistheminimumafterexcavationbalance.Forth,whenthes...