浅埋大跨度双线铁路隧道施工技术及变形控制技术研究

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1、西南交通大学硕士学位论文浅埋大跨度双线铁路隧道施工技术及变形控制技术研究姓名：苏兴申请学位级别：硕士专业：建筑与土木工程指导教师：高波;郭相武20080601西南交通大学硕士研究生学位论文第1l页ABSTRACTTakingJiaXianggoutunnelandBaoShiyantunnelintherailwaylinewhichrunsfromDaxiantoChengdufortwo-proposeofpassengerandcargotransportatthespeedof200km／hasengineeringbackground，thisthesi

2、shaselaboratedworkonrockdeformationingradeIII，IVandVsurroundingrock．，theaxialforcesinrockblotsandworkingstatuesoftunnelliningofthetwolinelargespantunnelwithshallowdepth．Thedeformationcriteriaforeachgradesurroundingrock,workingstatesofboltandsupportstructurehavebeenobtained．Thekeyachie

3、vementgoestosolvingtheconstructiontechniqueforlargespantunnelburiedshallowlyinhorizontalstrata．Thishasnotonlyensuredthesafetyandstabilityofsurroundingrockandtunnelsupport，butalsoacceleratedconstructionprocedureandshortenedconstructionperiod．Expectedeconomiceffecthasbeenacquiredintheli

4、ghtofthisstudy．Theprerequisiteistosolverockpressureappliedtotunnelliningunderspecificgeologicalconditionbeforedeterminingthestructuredesignandconstructiontechnique．BothJiaXianggoutunnelandBaoShiyantunnelpassthroughhorizontalstratawithclayandsandymudstone，theiroverburdenrangesfrom8m～20

5、m．Throughthestudyofthissubject，severalconclusionshavebeendrawnasfollows．Withrespecttohorizontalstratawithclayandsandymudstone，60％ofthehorizontalconvergenceandroofsubsidenceforsurroundingrockoccurschieflyduringconstructionoftheupperdrift，40％ofthesubsidenceanddisplacementconvergencetake

6、splaceduringtheconstructionofthebottomdrift．Theroofsubsidenceandhorizontaldisplacementvaryradicallyaftertheexcavationofupperdrift．ThesecondliningCanbeerectedafter30～40dayswhenbottomdrifthasbeenexcavated．ThesecondliningintunnelcrovVlrlbearsmuchlesssurroundingrockpressure，butthesidewall

7、bearsgreaterpressure．Duringthetunnelconstruction,primarysupportundertakesmainrockpressure；secondliningisusedtopreservesafetystorageandstrength．Thesecondingliningissafe．Afterin．situmonitoring，themaximumdepthofplasticzonebothinthetunnelroofandleftandrightsidewallreaches1．5n卜3．3m，thissho

8、wstha