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1、第25卷增2巖石力學(xué)與工程學(xué)報Vol.25Supp.22006年10月ChineseJournalofRockMechanicsandEngineeringOct.,2006富溪偏壓連拱隧道圍巖與支護結(jié)構(gòu)變形和受力特征分析1,23,44段海澎,徐干成,劉保國(1.安徽省交通投資集團有限責(zé)任公司,安徽合肥230011;2.成都理工大學(xué)環(huán)境與土木工程學(xué)院,四川成都610059;3.空軍工程設(shè)計研究局,北京100068;4.北京交通大學(xué)土木與建筑工程學(xué)院,北京100044)摘要:銅黃高速公路湯屯段富溪偏壓連拱隧道,長623m,洞口段圍巖為全風(fēng)化變質(zhì)砂巖,呈散體結(jié)構(gòu),
2、不能自穩(wěn)。洞口段左側(cè)埋深較右側(cè)大,存在明顯的偏壓。隧道施工采用三導(dǎo)洞法進行,施工期間對洞口段三導(dǎo)洞、正洞的多個斷面進行現(xiàn)場監(jiān)控量測。通過分析監(jiān)測數(shù)據(jù),可得圍巖變形與支護結(jié)構(gòu)受力特點。監(jiān)測結(jié)果表明:中導(dǎo)洞形成后,淺埋側(cè)導(dǎo)洞先行施工,其圍巖變形較深埋側(cè)導(dǎo)洞要大;正洞施工期間,深埋側(cè)拱頂下沉較淺埋側(cè)大,深埋側(cè)水平收斂呈擴張趨勢,淺埋側(cè)水平收斂呈收縮趨勢,中隔墻呈向淺埋側(cè)偏移趨勢;無論初期支護還是二次襯砌,其圍巖壓力、混凝土內(nèi)應(yīng)力均是深埋側(cè)大,由于整體襯砌有向淺埋側(cè)運動趨勢,鋼支撐所受應(yīng)力在淺埋側(cè)較大。分析結(jié)果對富溪偏壓隧道施工具有指導(dǎo)意義,對類似隧道的設(shè)計、施工和研
3、究具有借鑒和參考價值。關(guān)鍵詞:隧道工程;連拱隧道;地層偏壓;圍巖;支護結(jié)構(gòu)中圖分類號:U45文獻(xiàn)標(biāo)識碼:A文章編號:1000–6915(2006)增2–3763–06ANALYSISOFDEFORMATIONOFSURROUNDINGROCKANDSTRESSCHARACTERISTICSOFSUPPORTINGSTRUCTUREOFFUXITWINTUNNEL1,23,44DUANHaipeng,XUGancheng,LIUBaoguo(1.AnhuiProvincialCommunicationsInvestmentGroupCo.,Ltd.,Hefei,
4、Anhui230011,China;2.CollegeofEnvironmentandCivilEngineering,ChengduUniversityofTechnology,Chengdu,Sichuan610059,China;3.TheAirForceEngineeringDesignandResearchInstitute,Beijing100068,China;4.SchoolofCivilEngineeringandArchitecture,BeijingJiaotongUniversity,Beijing100044,China)Abstra
5、ct:FuxitwintunnelinTangkou—TunxisectionofTongling—HuangshanExpresswayiseccentriccompressedwiththelengthof623m.Weatheredmetasandstoneattheportalislooselystructuredandunstable.Theportalisapparentlyeccentricwiththeleftsideburieddeeperthantherightside.Threepilottunnelmethodhasbeenapplie
6、dfortunneling.Duringtheconstruction,sitemonitoringandmeasurementhavebeenconductedforvariouscrosssectionsofthethreepilottunnelsandthemaintunnel.Datahavebeenstudiedandanalyzed.Deformationofthesurroundingrocksandstressofthesupportingstructureshavebeennoted.Monitoringresultshowsthat,aft
7、ertheheading-throughofthecentralpilottunnel,constructionisorganizedfirstlyonthepilottunneloftheshallow-buriedside.Itisenvisagedthatthedeformationofthesurroundingrocksoftheshallowburiedsectionisgreaterthanthatofthedeepburiedone.Duringtheconstructionofthemaintunnel,archcrownsubsidence
8、atthedeep收稿日期:2005–