地质顺层偏压隧道偏压作用的数值分析

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1、西南交通大学硕士学位论文地质顺层偏压隧道偏压作用的数值分析姓名：邓彬申请学位级别：硕士专业：桥梁与隧道工程指导教师：周晓军20070501西南交通大学硕士研究生学位论文第fl页AbstractInthemountaintunnelconstructionprocess，usuallythetunnelwillpassthroughthelayeredrock．ItisadifficultproblemtoanalyseandcalculatethepressureOntheliningandthesafetyofthestructure．Withthehelpoftheore

2、ticalanalysisandfiniteelementmethod，thethesisstudiesthecalculationmethodforasymmetricpressureonsingle-linerailwaytunnelembeddedingeologicallybeddingstrata，andthefactorsoflayerthicknessandinclinedangleonasymmetricpressure．Thethesisstudiesthefollowingaspects：(1)Basedonthestudyofcertainliterat

3、ure，thethesisgivestheloadsdistribution011theliningstructureingeologicalbeddingstrata,withacertainassumptions,andtherewillnotexistasymmetricloadsunlessinclinedanglegreaterthanthefrictionangleofthebeddingplane．(2)Thethesissimulatesthebeddingsurfacewithsandwichelementandcontactelementmethodres

4、pectively,findingtheresultsthethickerthelayer,thesmallertheerror．Withtheincreaseoftheinclinedangle，theerroroftwomodelsisdecreased，andthenincreasing．Theerrorofsandwichelementisgreaterthanthecontactelement,butisacceptableinenglneeringerrorrange．Thethesissimulatesthejointwithsandwichelementmet

5、hod．(3)withacertainclinedangle，theloadontheleftwallisgreaterthantherightwall．Withtheincreaseofthelayerthickness，thelnsdonthevaulttrendstoaconstantvalue，butthewallwillbearamoreasymmetricload．f4)withtheincreasingoftheinclinedangle,theasymmetricloadontheliningstructureisincreasing，andthendecre

6、ased,whichattainitsultimatewheninclinedanglerangesbetween45and55degree。(5)Theinclinedanglehasroleontheliningstructure．Withtheincreasingoftheinclinedangle，themomentonthevaultispositive,andthennegativelyincreasing．Themomentontheleftwallattainsitsultimatewhentheinclinedangleis55degree．Thediffe

7、renceofmomentonthespandrelattainsultimatewheninclinedangleis45degree．(6)nereatesomemeasurestOdecreasetheharmofasymmetricloadappliedbygeologicallybeddingstrata，suchassectionasymmetricdesignandasymmetric西南交通大学硕士研究生学位论文第1II页reinforcementfortheliningstructur