列車荷載作用下立體交叉隧道結(jié)構(gòu)動(dòng)力響應(yīng)分析.pdf

1、西南交通大學(xué)碩士學(xué)位論文列車荷載作用下立體交叉隧道結(jié)構(gòu)動(dòng)力響應(yīng)分析姓名：汪偉松申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：橋梁與隧道工程指導(dǎo)教師：周曉軍20090501AbstractWiththerapidgrowthofourcountrynationaleconomy，transportationfacilitydemandincreaseforcomprehensivedevelopmentandutilizationofundergroundsp

2、ace，theinevitableemergenceofclosecrisscrossandoverlappingtunnelTheXinmeihuaMountainTunnelandWumengMountainTunnelprojectwastakenasthebackgroundofthisthesis，basedonthemaintheoryofthedynamicinteractionbetweentunnelstructure

3、、trackandrock，elastoplasticmaterialDPisusedtosimulatethesoilandlinearelasticmodelastunnelstructureThisthesisusesANSYStoestablishthreedimensionalfiniteelementmodelstostudythedynamicresponsestomovingtrainloadFirstlyaccordi

4、ngtothecharacteristicsoftrain，vibrationloadstartwiththegeometricirregularitywhichcausesthevehicledynamics，thisthesisusesanexcitingforcecorrespondingwiththemanagestandardofirregularitytosimulatetheverticaldynamicloadofthe

5、trainSecondly，aviscousspringboundaryisappliedinordertosimulatethesemiinfinityfeatureofthesoilTheinitialstressesofafterexcavationarecalculatedandthedampcoefficientsandtherationalsteptimeofvibrationanalysisaredefinedapplyi

6、ngthesubspaceiterationmethodFinallybasedonNewmarkStepbysteptimeintegrationmethod，accordingtomanycompositionsofthetrainvibrationloads，thedynamicresponseofthesystemareanalyzedunderthreeloadsituationsThestresses，displacemen

7、tsandweakportionsinthelineraredeterminedunderthevibration10adsSomeusefulconclusionsontheinfluenceofdynamicloadtosurroundingtunnelsareobtainedthroughcontrastThedynamicresponsesundertheconsiderationofdifferentworkcondition

8、sarediscussedinthethesiswhichincludesaccelerationresponse、displacementresponse、moment、axialforceThesedataarediscussedandsummarizedSOthattheresponsecurvesofdisplacementandaccelerationareobtainedthedirectionaldistributions

9、ofinternalforcearealsoobtainedThecalculationresultsshowthatthemaximdynamicresponsesoftunnelsappearlaterthanthetimewhenthemovingloadsarrive；especiallythedynamicstressesofinvertsareaffectedfurthestbyloadvelocityInaddition，