高地应力软岩隧道施工期时空效应与初期支护选型分析-(6269)

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1、万方数据ABSTRACTABSTRACTABSTRACT：Recently，tunnelsinsoftrockwithhighground-stressappearfrequentlyamongtherailwayandroadtunnelengineeringsunderconstructioninourcountry．Problems，suchaslargedeformation，supportingdamage，etc，seriouslyaffectthenormalconstructionofthesetunn

2、els．OnthebackgroundoftheconstructionofDaliangtunnelinLXS．7ofLanzhou．XinjiangdoublelineRailway,thetime-spaceeffectandselectionofsteelframefortunnelsinsoftrockWithhighground-stressweremainlydiscussed．Themainworkandtheresultswereasfollows：1．Basedontheconstructionof

3、Daliangtunnel，engineeringpropertiesoftunnelswithweaksurroundingrocksinhighground-stressregionwereresearchedbyseveralaspects．Characteristicsoflargedeformationinthesetunnelswereillustratedandextrusionindexforthequantitativeanalysisofitwasintroduced．2．UseANSYS／FLAC

4、3DnumericalanalysissoftwaretosimulateexcavationprocessofDaliangtunnel，analysethetemporalandspatialeffectofthesetunnels．Besidessupportingstructureinternalforce，contrastsurroundingrockplasticdeformationrange，heterotaxyofdifferentsequenceofexcavation．3．Onthebackgro

5、undoftheconstructionofDaliangtunnel，thedifferentapplicationeffectofsteelframeandsteelgridflameinhighground—stressregionweremainlydiscussed．TheDaliangtunnelistakenastheexperimentalsectioninwhichthesectionsteelandsteel咖dof20metersinlengtharesetrespectively．Themain

6、comparisonincludedthesettlementoftunnelcrownandarchfoot，hofizonmlconvergence，surroundingrockpressure，stressofinitialsupportingsteelframework，etc．Bypracticeprovingthatmultiplesupportrunseffectively．4．Accordingtothesurroundingrock-supportcharacteristiccurvetheory，

7、differentformsoftunnelsupportswithvariedstiffnesswereappliedtothetunnel，andtheirdeformationmechanismsandmechanicalresponseswerealsoinvestigated．Basedonthesurroundingrock-supportcharacteristiccurvetheory，severalpossiblerock-supportcharacteristiccurves，whichmaybeu

8、sedastheoreticalevidences，wereattainedforthetunllelsinhighground．stresssoftrock．Furthermore，thesupportformsuitableforlarge．deformationrockwasproposed．KEYWORDS：tunnell