排水粉噴樁復(fù)合地基固結(jié)理論研究.pdf

1、東南大學(xué)碩士學(xué)位論文排水粉噴樁復(fù)合地基固結(jié)理論研究姓名：陳蕾申請學(xué)位級別：碩士專業(yè)：巖土工程指導(dǎo)教師：劉松玉20060221AbstractAbstractDJMcombinedwithPVDmethod(2Dmethod)isanewsol(groundimprovementmethodwhichdevelopsfromDryjetmixingcolumnmethod(DJM)2Dmethodcoversalladvantagesof

2、DⅡVlanddrainageconsoliduteonmethodComparedwithtraditionalDJMthegroundimprovedby2DmethodhasadifferentruleonaccumulationanddissipationofexcessporewaterpressinvirtueofaddingthepenetrationpathofporewateringroundsoilBycontras

3、tingwiththethenceconsolidationmethodthepresenceofDJlvIaffordsthepileeffectwhichmakesthegroundhaveanobviouscompositebehaviorAsanewtechniquethetheoryof2DmethodstillneedafultllerstudyConsolidationtheoryisanimportantguidance

4、indesignandpracticeforsoftgroundthereisadirectcorrelationbetweensoils廿engthandconsolidationdegree，soitissignificanttorevealthebasalconsolidationbehaviorof2DmethodBasedonsuchbackgroundaresearchonconsolidationtheoryof2Dmet

5、hodisconductedinthepaperAsimplifiedconsolidationcalculationmodelofthegroundimprovedby2DmethodafterloadingisdevelopedbasedonBarronconsolidateiontheory；theformulasofporepressureandconsolidationdegreearededuced；thesimplifie

6、dconsolidationcalculationmethodaboutcompositegroundandsublayerisdiscussedrespectively；Consideringbothcompositegroundandsublayer，a2Dmethodconsolidationcalculationprogrambasedontheonedimensionconsolidationtheoryofdoublelay

7、ersiscompleted，whichcanalsoconsiderthecontinuityofporewaterpressurebetweenthetwolayers；aformulaofconsolidationdegreeundermultilevelloadingcondidlynisrecommendedbyconsideringthedissipationruleofexc∞o$porewaterpressureAnum

8、ericalsimulationmethodofthegroundimprovedby2Dmethodunderthesuppositionofplane一剛l‘a(chǎn)illtheoryisrecommendedwhichconsidersbothofsCessandpune仃ationconditions；aFEMmodelisfoundedbasedonBlotconsolidationtheory；theconsolidationch

9、aracteristicaboutafieldCkSeafterloadingissimulatedbythismethodandalsobecon打astedwimthenumericalsimulationresultsoftraditionalDJM硼1econclusionshowsthatexcessporewaterpressureof2DmethodislowerthanDJMatanytimebecauseofthead

10、ditionofdrainpathnotonlyincompositegroundbutalsoinsublayerandthenearerthesoilsbetothesurface，thelowertheporepressureBythefieldexperiment’acontrastismadebetween2DmethodandD2M，suchasconsolidationbehavioranddeformationrolee

11、tc，theresultsshowsthattherulesoftheexcessporewaterpressure，theconsolidationdegreeandthesettlementtimerelationshipareconsistentwiththefielddatesrespectivelywhichalsoconfmnsthatthetheoreticalanalysismethodandnumericalsimul

12、ationmothedusedhereareviableStillbythetheoreticalanalysisandnumericalsimulationthecontrastaboutconsolidationbehavioramong2Dmethod，DJMPVDandnaturegroundiscarded；thefactorswhichaffecttheconsolidationdegreeofthegroundimprov

13、edby2Dmethodareevaluated，suchasthemoduleof吣thecolumnspacing，thepenetrationcoefficientofPVDthemoduleandthethicknessofcushionandsoonTheconclusionshowsthatDJMhasmoreinfluenceontheporewaterpressureoftheuppersoil，andPVDandDJM

14、bothhavemoreinfluenceonthelowersoilAtacertainrangethedissipationofporewaterpressurecanbequickenedbyincre酗ingthemoduleofDJMandthepenetrationcoefficientofPVD，ordecreasingthecolumnspacingendthemoduleorthethicknessofthecushi