深厚軟土深長樁基壓縮層厚度試驗研究與沉降數值模擬.pdf

1、西南交通大學碩士學位論文深厚軟土深長樁基壓縮層厚度試驗研究與沉降數值模擬姓名：朱林申請學位級別：碩士專業(yè)：巖土工程指導教師：馬建林201205西南交通大學碩士研究生學位論文第lI頁AbstractThesettlementcalculationmethodforgrouppilesinexistentspecificationsismainlybasedonlayerwisesummationmethod，buttheresultisa

2、lwaysoverconservedForlackingincompressivelayerthicknessfielddataforgrouppilesespeciallyforlongfrictionpilesinthicksoftsoil，andtherearemorethanonecriterionforcompressivelayerthicknesscalculation，intensivestudyisneededtode

3、terminewhichcriterionisbetterforlongfiictiongrouppilesinthicksoftsoilThicknessofcompressivelayerisanimportantparameterforsettlementcalculationandasignificantbasisforfoundationsettlementanddeformation，SOitsfieldtesthasgre

4、atrealisticmeaninginpracticalen百neeringInaddition，compressionmodulusisanmajorfactorforsettlementcalculation，butcompressionmodulusprovidedbygeotechnicaltestisusuallyunderthepressureof100～200kPathoughit’Salwayssuitablefors

5、hallowfoundationwithasmallinaccuracybuttheinaccuracycoMPared、Ⅳimthefielddataismuchbiggerforcalculationoflongfrictionpilesinthicksoftsoil，sometimestheinaccuracywillamountsev蹦altimesofthefielddatawhichmakesthetheoreticalca

6、lculationandnumeralsimulationoffoundationsettlementunrealisticInviewoftheabove，singlepointsettlementgaugeandliquidlevelsettlementgaugeareadoptedtomonitorthecompressivelayerthicknessandsettlementoflongfrictiongrouppilesin

7、thicksoftsoil，whichmakesthesinglepointsettlementgaugeavoidedanchoringinbedrockorstablesoillayerandalsothecompressivelayerthicknessandthesettlementofthegrouppilesareobtainedAnewformulaforcompressionmodulusmodificationalon

8、gthicksoftsoilisputforwardinthiste甌basedontheformulacoMParativeanalysisofgrouppilessettlementbyexistentnationalspecificationsiscarriedoutandcombined謝tlllO％‘methodofcontrolstress”。whichusedtocontrolcompressivelayerthickne

9、ss，isadoptedtocalculatesettlementoflongfrictiongrouppilesinthicksoftsoilThroughcoMParison、析Ⅱlthefielddatasettlementvaluebythismethodisclosetothemeasuredvalue，whichprovestheapplicabilityincalculatingsettlementinthicksofts

10、oilBasedonmodifiedcompressionmodulusEllcompressionmodulus乓o_I川providedbygeotechnicaltestunderthepressureof100—200kPacompressivelayerthicknessby“methodofcontrolstress”，experientialcompressivelayerthickness，settlementnumer

11、alsimulationoflongfiictiongrouppilesinthicksoftsoilbyPlaxis3DFoundationfiniteelementsoftwareiscarriedout，whichprovesthatsettlementnumeralsimulationbasedonmodifiedcompressionmodulusE∥compressivelayerthicknessby‘‘methodofc