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1、第41卷,第4期公路工程Vol.41,No.42016年8月HighwayEngineeringAug.,2016豫西北變質(zhì)巖區(qū)隧道圍巖變形特性研究12于衛(wèi)云,白蕾(1.新蒲建設(shè)集團(tuán)有限公司,河南鄭州450012;2.河南建筑職業(yè)技術(shù)學(xué)院,河南鄭州450000)[摘要]變質(zhì)巖由于構(gòu)造與區(qū)域變質(zhì)作用,其形成過程與物理力學(xué)性質(zhì)特殊,隧道圍巖應(yīng)力較為復(fù)雜。針對這一現(xiàn)象,以豫西北地區(qū)典型的變質(zhì)巖隧道作為研究對象,在充分收集和分析其工程地質(zhì)背景的基礎(chǔ)上,利用FLAC3d軟件建立了該隧道的有限元數(shù)值模型,模擬了在不
2、同埋深、凈距條件下變質(zhì)巖隧道的圍巖應(yīng)力分布特征。研究表明:變質(zhì)巖隧道圍巖的豎向應(yīng)力與水平向應(yīng)力與埋深大致呈線性正相關(guān)關(guān)系;偏壓角的變化主要改變隧道右洞一定范圍內(nèi)的圍巖應(yīng)力分布,而左洞周邊圍巖應(yīng)力分布狀態(tài)基本保持不變;凈距的變化對中夾巖部分的圍巖應(yīng)力影響較大,中夾巖應(yīng)力隨凈距的增大而明顯減小。這一現(xiàn)象對于變質(zhì)巖隧道施工過程中圍巖變形預(yù)防和處理措施具有一定實(shí)際應(yīng)用價(jià)值。[關(guān)鍵詞]高圍巖應(yīng)力;隧道;變形+[中圖分類號]U456.31[文獻(xiàn)標(biāo)識碼]A[文章編號]1674—0610(2016)04—0032—05
3、ResearchofMetamorphicRockAreaofTunnelSurroundingRockDeformationCharacteristicsinHubeiProvince12YUWeiyun,BAILei(1.XinpuConstructionGroupCo.Ltd.,Zhengzhou,Henan450012,China;2.HenanArchitectureProfessionalTechnologyInstitute,Zhengzhou,Henan450000,China)[Abs
4、tract]Metamorphicrockduetostructuralandregionalmetamorphism,anditsformingprocessandthespecialphysicalandmechanicalproperties,thetunnelsurroundingrockstressismorecomplicat-ed.Inreactiontothephenomenon,thispapertypicalmetamorphicrocktunnelinnorthwestareaas
5、there-searchobject,inthecollectionandanalysisofitsgeologicalbackground,onthebasisofusingFLAC3dsoftwaretoestablishthefiniteelementnumericalmodelofthetunnel,simulatedundertheconditionofdifferentburieddepth,themetamorphicrockofthetunnelsurroundingrockstress
6、distributioncharacteris-tics.Researchshowsthat:themetamorphicrocktunnelsurroundingrockstressandhorizontaltotheverti-calstressandtheburieddepthisroughlylinearpositivecorrelation;BiasAnglechangemaintunnelholerightmustbewithinthescopeofthesurroundingrockstr
7、essdistribution,stressdistributioninsurroundingrockandtheleftholestatebasicremainunchanged;Netfromthechangeoftheinfluenceonsurroundingrockstressofsurroundingrockinlarger,inthesurroundingrockstressalongwiththeincreaseofnetdis-tancedecreasesobviously.Thisp
8、henomenonformetamorphicrocktunnelsurroundingrockdeformationofthepreventionandtreatmentmeasuresintheconstructionprocesshascertainactualapplicationvalue.[Keywords]highstressofsurroundingrock;tunnel;deformation[1-3]為應(yīng)將變質(zhì)巖劃入軟巖