成層土中樁縱向振動理論及其在pit中的應(yīng)用

1、浙江大學(xué)博士學(xué)位論文成層土中樁縱向振動理論及其在PIT中的應(yīng)用姓名：王騰申請學(xué)位級別：博士專業(yè)：巖土工程指導(dǎo)教師：謝康和2001.5.1ABSTRACTLongitudinalvibrationtheoryofpileisthebasisofanykindofmethodindynamicpiletestingwhichcanbeusedt。explainthedynamicreactionbetweenpileandsoil，them

2、echanicsofpiletesting，andtoillustratethepiletestingcurvesInthisdissertation，onthebasisoftheexistingworkthelongitudinalvibrationpropertiesofthepilewithdefectsinlayeredsoilshavebeenstudiedwitIlatotaIlynewapproachThemainori

3、ginalworkinc]udes：Firstlyitisnecessarytostudythevibrationbehaviorofpileinlayeredsoilssincelayeredpropertyisoneofthemaincb2xacteristicsofsolls口atumWithLaplacetransfofibs，theanalyticajexpressionoftheimpedancefonotion紐deftv

4、edforthepile；nlayeredsoilssubjectedtoartexcitingforceatitstopThenasemianal蜘calsolutionoftheveloci母responseintimedomainundersemisineexcitingforceisgivenBasedonthesolutions，theinfluenceofsoilmodulusonthedynamicstiffnessand

5、thedynamicdampingofthesystemofpileandsoil，andthatOFttheCUrvesofmechanicaladmittanceandthereflectionwaveofpileareanalyzedInordertoexplaintheresponsecurvesofpilecorrectly，thecurvescorrespondingtosoilmodulusvaryingalecompar

6、edwiththeonescorrespondingtodefectivepileSecondlysincethemainobjectiveofperformingdynamicpiletestingistoevaluatetheintegrityofdrillshaftsdefinitivelythestudyisfocused013thevibrationpropertiesofdefecfivepile1medefectivepi

7、lesfallintotwocategoriesaccordingtothecal3sestheyformed：oneisthepilewithvariabiesectionstheotheristhepilewithvariablemodulusInthedissertationasemianalyticalsolutionforaoileofarbitrarysegmentswithvailablesectionaregtand弛a

8、nalyticaloneforapiieofarbitrarysegmentswi也variablemoduiusarederivedrespectivelynesolutionsarethenextendedinasemianalyticalformtothedefectivepilewithorbitrarysegmentsinlayeredsoilsUsingtimsesolutions，theinfluencesoffthevi

9、brationpropertiescausedbythedegreeofpiledefects，theleag幽andthelocationofthedefectstheexcitingfrequencyandthedampingofpilematerialarestudiedComparisonisalsomadeforthevibrationpropertiesofthepilewithvmiablesectionand幽eonew

10、i出variableroodulusFurthermore，toveilfythetheorydevelopedherein，thetiltedcurvesofanalyticalsolutionsarecomparedwiththefieldmeasuredones，whichshowsthattheyareinagoodagreementFinally，bymeansof3Dfiniteelementmethodtheinfluen

11、ceof‘，Deffect’onthevibrationpropertiesofthedefectivepileisstudied，andthedifferenceofvibrationpropertiesbetweenthepilewith岫“ialdefectandtheonewitha：(ialdefectiscomparedMoreovertheresultobtainedfrom3DFEMandtheonefrom1Danal