资源描述：
《南京地铁软流塑地层浅埋暗挖法施工技术的探讨》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、南京地铁软流塑地层浅埋暗挖法施工技术的探讨第24卷第3期2005年2月岩石力学与工程ChineseJournalofRockMechanicsandEngineering,,01.24No.3F6.,2005南京地铁软流塑地层浅埋暗挖法施工技术的探讨周顺华,张先锋,余才高,杨龙才(1.同济大学道路与交通工程教育部重点实验室,上海200331:2.中铁隧道设计院,河南洛阳471009;3.南京地铁公司,江苏南京210024)■要:针对南京地铁鼓楼一玄武门区间隧道穿过软流塑地层的特点,采用土工离心机对地表有相对硬壳层和地表无相对硬壳层中隧道开挖之后地层的变形机
2、理进行模拟.模拟发现,地表有相对硬壳层时,隧道以两侧挤压变形为主,地表无相对硬壳层时,隧道以竖向压缩变形为主,为工程措施的选择提供了依据;同时根据管棚格栅的支护体系和应力分布的特点,建立了隧道挤土变形的计算公式,提出了管棚间土体形成的"微拱"效应,论证了通过注浆可提高土体的强度和变形模量,从而强化"微拱",并大大减少挤土变形量.以南京地铁试验段的实测为基础,分析了软流塑地层中隧道施工引起的各部分变形情况,进而提出了相应的工程措施.关t词:隧道工程;软塑流塑地层;管棚;注浆;失水中圈分类号:U45l文献标识码:A文章编号:1000—6915(2005)03—
3、0526—06STUDYoNEXCAVATIoNMETHoDUNDERSHALLoWoVERBURDENoFSoFT-FLoWGRoUNDZHOUShun—hua,ZHANGXian—feng2,SHECai—gao3,YANGLong—cail(1.KeyLaboratoryofRoadandTrafficEngineeringofMinistryofEducation,TongjiUniversity,Shanghai200331,China:2.SurveyandDesignInstitute,ChinaRailwayTunnelGroup,Luoy
4、ang471009,China;3.,ngMetroCorporation,Nanjing210024,China)Abstract:ConsideringthecharacteristicsoftunnelsectionofNanjingmetrobetweenGuloustationandXuanwumenstation,thedeformationofthetunnel,resultingfromtheexcavationinthesoft—flowgroundwithorwithoutrelativelyhardcrustlayer,iSsimul
5、atedbycentrifugemodeltests.ItiSfoundthatifthegroundsurfacehashardcrustlayer,themaindeformationofthetunneliScrusheddeformationontwosides,otherwise,themaindeformationiScompressiveoneinverticaldirection.Meanwhile.accordingtothesupportsystemandstressdistributionofthetubeshedandsteelar
6、ch,thecalculationformulasofthecrushedsoildeformationaleestablished,andthetinyarcheffectsbetweenpipesarepresented.ItiSshownthatthesoilstrengthandthedeformationmoduluscanbestrengthenedbygroutingmethod,SOthatthetinyarchiSreinforcedandthecrushedsoildeformationiSconsiderablyreduced.Bas
7、edonthein—situdeformationoftheNanjingmetro.thegrounddeformationresultingfromtheconstructionofthetunnelinsoft—flowgroundiSanalyzed,andthecorrespondentconstructionmeasuresarepresented.Keywords:tunnelengineering:soft—flowground:tubeshed:grouting:dehydration—I【一日期t作者■介:作.E—mail:2003—0
8、6—25:修目日期l2003—09—23周顺华(1964一),男,
