黃土暗穴的成因及其公路工程災害效應研究.pdf

1、長安大學博士學位論文黃土暗穴的成因及其公路工程災害效應研究姓名：李喜安申請學位級別：博士專業(yè)：地質(zhì)工程指導教師：彭建兵20040101AbstractOnthebasisoffieldresearchandsystematiCanalysisofthepredecessors’achievements，forthefirsttimethisdissertationhasestablishedapracticalsystemtociass

2、ifyanddenominatehiddenholesinloess，zonedtheIoessplateauaccordingtothedevelopmentaldensityofhiddenholes，studiedandsummarizedtheintrinsicrelationsbetweenthedistributionofhiddenholesandtopographygeomorphologythepropertyofso

3、il，aswellastheirdevelopmentaldepthThegenesisandtheformationmechanismofhiddenholesi11Ioessare1ucubrated，AccordingtOthepaththemodeandtheconsequenceoftheactionofwater，theforrnationpatternoflliddenholeshasbeengeneralizedasth

4、efollowingfivetypes：abrasionbreakthrough，abrasion—undergrounderosion—breakthroughc0|laPSe—undergrounderosionIbreakthrough，abrasionundergrounderosioncollapseundergrounderosionbreakthroughandthecompoundBasedonthiStheformat

5、ionandevolutionaryprocessofhiddenholesinloess1SdividedintofiveperiodsasfoIlows：incubationperiod，formationperiod，developmentalperiod，breakdownperiod，andextinctionperiodMeanwhilethispaperhasfundamentallyunifledtheviewpoint

6、onthecausesofhiddenholesinlOCSScollapseandundergrounderosionasthemaincausesinincubationperiodundergrounderosionandabrasioninformationperiod，abrasionindevelopmentalperiod，gravitycollapseandabrasioninbreakdownperiodSincehi

7、ddenholesinloessfrequentlycausedamagestohighwayprojects，thestudyhasbeenfoeusedonthedamagesandtheirformationmechanismonthebasisofathoroughgeneralizationoftheirdamagetypesBymeansofnumericalsimulation，thispaperhasfurtherana

8、lyzedthevariationofstressesandbreakdownmechanismofsubgradeandslideslopeinducedbyhiddenholesin10essundertheeffectofdynamicload，preliminarilyexploredthedamageformationmechanismofsubgradeandslideslopewithhiddenholes1thasope

9、nedupnewroomforthefurtherstudyofsuchgeologicaldisastersinloessareaBymeansofcomprehensiveandcomparativeanalysisofvariousanalyticmethods，theanalyticmethodhasbeendeducedandestablishedtocomputehiddenholes’criticalthicknessTo

10、solvetheproblemoffrequentdynamic10adofvehiclesonroadsurface，withthehelpoffiniteelementnumericalanalysis，thepaperhaspreliminarilystudiedthecontributionofunderlyinghiddenholesinloesstOsubgradestabilityundertheeffectofdynam

11、icloadofvehicles，providinganecessarytheoreticalfoundationforthestudyofpreventionandtreatmentmeasuresofhiddenholesinhighwaysKeywords：hiddenholesinloess；classificationandname；distributionpatterngenesisandmechanism；highwayp