長期反復(fù)荷載作用下土體與鄰近樁基相互作用研究.pdf

1、同濟大學(xué)博士學(xué)位論文長期反復(fù)荷載作用下土體與鄰近樁基相互作用研究姓名：周洪波申請學(xué)位級別：博士專業(yè)：巖土工程指導(dǎo)教師：楊敏20050101AbstractSoilandpilefoundationinteractionunderlongtermrepeatedloadinghasbecaoneofthemostim【portantissuesofgcotechnicalengineeringintheworidfornearsevera

2、ltenycarsThemainpointsofthisresearchconsistoftwoparts，oneisthecharacteristicsofsoilsunderlongtermrepeatedsurchargeloads，theotheristheresponseofnearpilcdfoundafionsubjectedtolateralloadingfromhorizontalsollmovementsgenera

3、tedbytheapproachsurchargeloadsSomemainworksandachievementsofthisdissertationarcdescribedasfollows：Thispaperdiscussesthecharacteristicsofsoilsunderlongtermrepeatedsurchargeloadsindetailbvstudyingtherelevantresllltsreposed

4、intheliteratureItintroducestheconceptofcriticalrepeatedstresslevelintotheCarterModelbasedonthecriticalstatesoilmechanicsandimprovestheCarterModeltoModifiedQIncrModelThcModifledCallerModel鋤reflectreasonablythemaincharacte

5、risticsofsoilsunderIongteHnrepeatedsurchargeloadsandit∞nbeusedtoanalyzeconvenientlytheinteractionbetweensoilandpilefoundationunderlongtermrepeatedloadingThen，thispaperanalysessoilandpilefoundationinteractionunderlongterm

6、repeatedloadingindetailusingtheplanestrainFEMprogramIntheprogramthecharacteristicsofsoilsunderlongtermrepeatedsurcharge10adssimulatesbytheModifiedCarterModelItfindsthatsettlementsatthecenterofloadingareaanddisplacementat

7、thesideofloadingareaareaffectedbyseveralfactors。suchasthemagnitudeof0，criticalrepeatedstresslevelrc，theloadingnumberandpilestiffness，etcThesettlementsanddisplacementsincreasewhenthemagnitudeof0ofthemiddlesoftsoilstratumo

8、rtheloadingnumberincaedlscsOntheotherhand，whenthecriticalrepeatedstresslevelreofthemiddlesoftsoilstratumincreasestlIesettlementsanddisplacementsdecreaseIftherehaveseveralpilesatthesideoftheloadingarea，thesettlementsanddi

9、splacementswilldecreasebecauseofthepileshadowingeffectandthemagnitudeofchangeisleIatedtothepilestiffnessThispaperalsoanalysestheinteractionbetweensoilandpilefoundationsubjectedtosoilmovementsbv3DFEMItfindsthatthedisplace

10、mentsandmomentsofthepileincreasewiththesoilmovements。Whenthepilestiffnessincresses。thecharacteristicsofpileisrigidandwhenthepilestifinessdecreases，thecharacteristicsofpileisflexibleItiscoUllnontousetheloadtransfercurves(

11、p～Ycurves)orPoulos’selastictheorytocalculatepilessubjectedtolateraIsoilmovementsatpresentThispaperdiscussesthecharacteristiesofthetwometIlodsanddevelopsanewsouplinganalyticalsolufionbasedonthetwomethodsInthenewmethodthes

12、olImodulusalongpilelengtha聆calculatedbylheP—Ycurvesaccordingthesollelements’stresseslevelandlateraldisplacementsbetweenthepileelementsandsoilelementsthentheelastictheoryisusedtoaccountforthesoilpileintemctionbetweendifie