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1、東南大學(xué)碩士學(xué)位論文路堤荷載下CFG樁復(fù)合地基沉降特性研究姓名:盛小龍申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):巖土工程指導(dǎo)教師:潘衛(wèi)東20090319摘要路堤荷載下CFG樁復(fù)合地基沉降特性研究碩士研究生:盛小龍指導(dǎo)老師:潘衛(wèi)東副教授東南大學(xué)土木工程學(xué)院CFG樁由于承載力高、沉降量小、穩(wěn)定快、無需配筋、利用T業(yè)廢料、工期短等優(yōu)點(diǎn),應(yīng)用越來越廣泛。但CFG樁處理客運(yùn)專線軟土地基,國內(nèi)尚屬起步階段,現(xiàn)場試驗(yàn)較少,沒有現(xiàn)成的經(jīng)驗(yàn)可取。因此,研究客運(yùn)專線CFG樁復(fù)合地基在路堤荷載作用下的沉降變形特性,對(duì)進(jìn)一步的指導(dǎo)今后的設(shè)
2、計(jì)、施工與檢測,具有重要意義。首先,本文介紹了CFG樁復(fù)合地基的作用機(jī)理以及國內(nèi)外學(xué)者對(duì)CFG樁復(fù)合地基所作的研究,然后選取武廣客運(yùn)專線第XXTJVI標(biāo)六個(gè)典型路基斷面,實(shí)測了CFG樁復(fù)合地基在路堤填筑施T期及放置期內(nèi)的沉降變形,研究了路堤荷載作用下CFG樁復(fù)合地基的沉降變形特性,提出了以沉降速率為指標(biāo)的路堤填筑動(dòng)態(tài)控制標(biāo)準(zhǔn)。其次,對(duì)六個(gè)典型斷面的實(shí)測沉降數(shù)據(jù)采用三種形式的曲線擬合,確定了路基斷面-T后沉降起算時(shí)間點(diǎn),并由此預(yù)測了路基工后沉降量及剩余沉降量,為合理確定上部結(jié)構(gòu)鋪設(shè)時(shí)間提供參考。最后
3、,以六個(gè)觀測斷面的地質(zhì)條件為基礎(chǔ),配以適當(dāng)?shù)募俣?,建立局部路基ABAQUS三維有限元基礎(chǔ)模型,計(jì)算CFG樁復(fù)合地基在分級(jí)填筑路堤荷載作用下的總沉降。在驗(yàn)證了基礎(chǔ)模型的合理性之后,通過調(diào)整參數(shù)“樁十模量比”獲得了在路堤荷載作用下樁身模量、樁體長度、下臥土層模量及下臥土層厚度對(duì)路基沉降的影響規(guī)律,為優(yōu)化設(shè)計(jì)和施工提供了一些有益的參考。關(guān)鍵詞:CFG樁復(fù)合地基沉降變形ABAQUS樁土模量比摘要StudyofSettlementProperitiesofCFG——PileFoudationUnderthe
4、LoadofEmbarkmentSpecialty:GeotechnicalEngineeringGraduatestudent:SHENGXiaolongSupervisor:AssociateProf.PANWei—dongDepartmentofCiVilEngineering:SoutheastUniversityABSTRACTCFG—Pilecompositefoundation,whichpossessesthefollowingmerits:smallsettlement,high
5、beatingcapacity,rapidstability,shorttimelimitforaproject,withoutreinforcement,usingindustrialwaste,etc.iswidelyusedbyconstructiondepartment.ButusingCFG-Piletodealwithsoftsoilfoundationofhigh·speedrailway,isstillinstartingstageinchina.Atpresent,thereis
6、noexistingexperience,andonlyafewtestsinfieldhavebeenreported.So,studyingthesettlementpropertiesofCFG—Pilehasveryimportantsignificanceforthedesign,constructionanddetectioninthefuture.Firstly,itintroducesCFG-pilecompositefoundationandthemechanismofCFG·P
7、ilecompositefoundationresearch,thenmeasuredthesettlementofsixtypicalembarkmentsectionsofthewuhan·guangzhoupassenger-dedicatedlineundertheloadofroadembarkmenttostudytheCFG··Pilecompositefoundationsettlementdeformationcharacteristics,andputsforwardthein
8、dexbysedimentationrateforthedynamiccontrolstandardofroadembarkmentconstruction.Secondly,bycurve·fittingforthemeasurementofsixtypicalsectionofsubsidence塒tllthreeforms.itdeterminesthetimeforanalysisofpost-constructionsettlememttoroadbedsection,a