長期反復荷載作用下土體與鄰近樁基相互作用研究.pdf

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