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，seriouslyaffectthenormalconstructionoftheset

2、unnels．OnthebackgroundoftheconstructionofDaliangtunnelinLXS．7ofLanzhou．XinjiangdoublelineRailway,thetime-spaceeffectandselectionofsteelframefortunnelsinsoftrockWithhighground-stressweremainlydiscussed．Themainworkandtheresultswereasfollows：1．Basedontheconstruc

3、tionofDaliangtunnel，engineeringpropertiesoftunnelswithweaksurroundingrocksinhighground-stressregionwereresearchedbyseveralaspects．Characteristicsoflargedeformationinthesetunnelswereillustratedandextrusionindexforthequantitativeanalysisofitwasintroduced．2．UseA

4、NSYS／FLAC3DnumericalanalysissoftwaretosimulateexcavationprocessofDaliangtunnel，analysethetemporalandspatialeffectofthesetunnels．Besidessupportingstructureinternalforce，contrastsurroundingrockplasticdeformationrange，heterotaxyofdifferentsequenceofexcavation．3．

5、OnthebackgroundoftheconstructionofDaliangtunnel，thedifferentapplicationeffectofsteelframeandsteelgridflameinhighground—stressregionweremainlydiscussed．TheDaliangtunnelistakenastheexperimentalsectioninwhichthesectionsteelandsteel咖dof20metersinlengtharesetrespe

6、ctively．Themaincomparisonincludedthesettlementoftunnelcrownandarchfoot，hofizonmlconvergence，surroundingrockpressure，stressofinitialsupportingsteelframework，etc．Bypracticeprovingthatmultiplesupportrunseffectively．4．Accordingtothesurroundingrock-supportcharacte

7、risticcurvetheory，differentformsoftunnelsupportswithvariedstiffnesswereappliedtothetunnel，andtheirdeformationmechanismsandmechanicalresponseswerealsoinvestigated．Basedonthesurroundingrock-supportcharacteristiccurvetheory，severalpossiblerock-supportcharacteris

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