大直徑鉆孔灌注樁的承載力與沉降研究.pdf

1、東南大學(xué)博士學(xué)位論文大直徑鉆孔灌注樁的承載力與沉降研究姓名：石名磊申請學(xué)位級別：博士專業(yè)：道路與鐵道工程指導(dǎo)教師：鄧學(xué)鈞劉松玉2002.2.1AStudyofCapacityandSettlementofLDBPsCombinedwiththefieldtestresultsfromsomesubjectsoulagerdiameterboredpiles(LDBPs)usedinbridgeengineering，classicela

2、stictheorynumericalsolution，multivariatestatisticalinference，non—linearparametersimitating，andartificialneuralnetworkswereemployedtostudythebearingcapacityandthesettlementbehavioursoftheLDBPsinasystematicwayThisthesismai

3、nlyincludestwopartsInthefirstpart，themechanismoftheverticalultimatebearingcapacityofsinglepilesandthepredictingapproachesforLDBPsembeddedinlayeredcohesivesoilsarestudiedInthesecondpart，thesettlementcharacteristicsandthep

4、redictingapproachesforthesettlementofsinglepiles，pilegroupsandpilefoundationareinvestigatedBasedonabundantdatafromstatic—loadtestsoninstrumentedpilestheworkingmechanismandthepredictingapproachesforbearingcapacityofsingle

5、pileswereinvestigatedfunherTberepresentative“Ⅱmethod”inundralnedconditionwasmodifiedtopredictthepileshaftskinfrictionandthatcombinesthe疔ictionangleandthecohesionofclayineriectThenewpredictingmethodforbearingcapacityofsin

6、glepilesincohesivesoillayerswasestablishedbythecountNofStandardPenetration“rest(SPT)andthestatisticaIanalysisofthedatameasuredfrominstrumentedpileteststestifiedtotherationalityofthemethod，InadditionthemethodtopredictLowe

7、rBoundCapacitywasdiscussedforwhichtherewouldbeacertainprobabilityfeg90％1thatthemeasuredvalueswouldexceedthispredictedvalueTheprincipalcomponentanalysisinmultivariatestatisticalinferencewasusedintheanalysisoftheroutinevar

8、iousindexesthattosynthesizetheinformationofcohesionsoils’bebavioursInviewofthisthecohesivesoilcharacteristicsdeterminedbytheliquidindexIIasalluniqueindex，wasdiscussedinmathematics，andsomenewmodifiedviewswereproposed。Asre

9、sultsoftheprincipalcomponentanalysis，themostrationalcompositeindexesofcobesivesoi】weredeterminedandthattheBPattificialneuralnetworksmodelutilizedtopredicttheultimatepileshaftresistancewasstudiedTheabovementionedresultsgi

10、vesguidanceandnewrouteforfutureresearchonpredictingbearingcapacityofsinglepilesTheclassic】oadtransferapproachandthefiniteelementmethodofonedimensionalrodstructurecombinedtoestablishthehybridmethodforcalculatingsinglepile

11、settlementandoneprogramSPSA】thecalculatingprogramofsinglepilesettlementhadbeenrealizedInthemethod，thetrilinearspringstiffnessissuggestedtoevaluatetherelationshipofloadtransferalongthewholelenlgthofthepileinnonhomogeneous

12、soilsTheapproachisusedtocomputethesettlementresponseoffivefieldsinglepilesembeddedinlayeredclays，andreasonableagreementisobservedbetweenmeasuredandcomputedbehavioursBasedonthesameprinciple，otherprogramSPSA2，thepredicting

13、programofsinglepilesettlementhadcomposedwithRandolphandWroth’ModelAbybridmethodforestimatingsettlementofpilegroupswaspresentedbasedontheMindlinequationforverticaldisplacementinasemiinfinitemassresultingfrominteriorvertic

14、alloadingTheprogramGPSAlforsettlementofpilegroupswasrealizedandtheparametersfiningforpilegroupscanperformonthebasisofSPSA2AccordingtandolphandWroth’Modelanewconceptof“restrairr’actionbetweenpileswasusedtomodeltheeriectof

15、therigidityofthepileandtheinteractionbetweenthepileandthesurroundingsoilmediumConsideringtheseactionsintheprogramGPSAl，thesettlementresponseofpilegroupswasresearchedinasystematicwayespeciallythepilegroupsunderrigidcapKEY