欢迎来到天天文库
浏览记录
ID:36506687
大小:310.03 KB
页数:6页
时间:2019-05-11
《富溪偏压连拱隧道围岩与支护结构变形和受力特征分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第25卷增2岩石力学与工程学报Vol.25Supp.22006年10月ChineseJournalofRockMechanicsandEngineeringOct.,2006富溪偏压连拱隧道围岩与支护结构变形和受力特征分析1,23,44段海澎,徐干成,刘保国(1.安徽省交通投资集团有限责任公司,安徽合肥230011;2.成都理工大学环境与土木工程学院,四川成都610059;3.空军工程设计研究局,北京100068;4.北京交通大学土木与建筑工程学院,北京100044)摘要:铜黄高速公路汤屯段富溪偏压连拱隧道,长623m,洞口段围岩为全风化变质砂岩,呈散体结构,
2、不能自稳。洞口段左侧埋深较右侧大,存在明显的偏压。隧道施工采用三导洞法进行,施工期间对洞口段三导洞、正洞的多个断面进行现场监控量测。通过分析监测数据,可得围岩变形与支护结构受力特点。监测结果表明:中导洞形成后,浅埋侧导洞先行施工,其围岩变形较深埋侧导洞要大;正洞施工期间,深埋侧拱顶下沉较浅埋侧大,深埋侧水平收敛呈扩张趋势,浅埋侧水平收敛呈收缩趋势,中隔墙呈向浅埋侧偏移趋势;无论初期支护还是二次衬砌,其围岩压力、混凝土内应力均是深埋侧大,由于整体衬砌有向浅埋侧运动趋势,钢支撑所受应力在浅埋侧较大。分析结果对富溪偏压隧道施工具有指导意义,对类似隧道的设计、施工和研
3、究具有借鉴和参考价值。关键词:隧道工程;连拱隧道;地层偏压;围岩;支护结构中图分类号:U45文献标识码:A文章编号: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–
此文档下载收益归作者所有