自然界中具有层状构造的沉积岩约占陆地面积的2/3,水平层状围岩大量分布,在高速公路隧道建设中经常遇到水平层状围岩,由于具有层状结构,岩体变形及强度性质具有明显的各向异性,岩体的破坏方式及破坏形态很大程度取决于结构面及岩石裂隙发育情况[1]。工程实践中,Ⅲ级水平岩层围岩隧道拱顶掉块及模塌方时有发生,给隧道施工带来了严重的安全隐患;因此,完善水平岩层支护参数,进行针对性设计,对保证安全施工、提高围岩稳定性及节约投资具有重要意义[2~3]。近水平岩层状围岩公路特长隧道支护参数优化研究罗袁羲1,彭文辉1,张美琴2,彭坤2*(1.中铁宜宾投资建设有限公司,四川宜宾644000;2.中铁第六勘察设计院集团有限公司,天津300308)OptimizationStudyofSupportParametersforLongHighwayTunnelsinCloseProximitytoHorizontalLayeredRockMassesonHighwaysLUOYuanxi1,PENGWenhui1,ZHANGMeiqin2,PENGKun2*(1.ChinaRailwayYibinInvestmentandConstructionCo.Ltd.,Yibin644000,China;2.ChinaRailwayLiuyuanGroupCo.Ltd.,Tianjin300308,China)【Abstract】:Consideringdistinctdifferencesexistinthefailurecharacteristicsatthearchcrownandsidewallofsuchrockformations.Throughthestudyoffailurecharacteristicsintunnelswithnearlyhorizontalrockstrata,numericalcalculations,monitoringfeedbackmethods,andtheconsiderationofthedeteriorativeeffectsofblastingonsurroundingrockandstructuralplaneswereemployed.Thisanalysisevaluatedvariousparameters,suchasdisplacementsandaxialforcesofanchorrods,toproposeanoptimizedapproachfortunnelsinnearlyhorizon⁃talrockstrata.Theresearchresultindicatesthatfordeeplyburiedhardrocktunnelswithnearlyhorizontalstrata,itisfeasibletoeliminateanchorrodsinthesidewallareaandonlyinstallthemwithinthearchcrownzone,resultinginapproximately40%reductioninanchorrodquantity,therebysavingcostsandensuringsafetywhilealsoshorteningtheconstructionperiod.【Keywords】:closehorizontalrockstrata;longhighwaytunnel;supportparameters【摘要】:考虑近水平岩层拱顶及拱墙处的破坏特征存在明显的差异,对近水平岩层隧道的破坏特征进行研究;采用数值计算及监测反馈的方法,考虑爆破对围岩及结构面的劣化作用,分析隧道各个部位的位移、锚杆轴力等数值,提出近...