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1、萬方數(shù)據(jù)第30卷第4期巖石力學與工程學報V01.30No.42011年4月ChineseJournalofRockMechanicsandEngineeringApril,2011剛性樁復合地基優(yōu)化設計楊光華1~,李德吉1,官大庶3(1.廣東省水利水電科學研究院,廣東廣州510610:2.華南理工大學土木工程系,廣東廣州510641;3.珠江水利科學研究院,廣東廣州510610)囊耍t采用原狀土切線模量法分別計算地基土和樁基的非線性e-s(荷載一沉降)曲線。假設兩者為相對獨立的體系,在樁和土的位移相等的條件下,根據(jù)樁和土的P-S曲線確定樁
2、和土分擔的荷載。通過控制沉降量和調(diào)整墊層的厚度,協(xié)調(diào)樁、土的相對剛度,使天然地基和樁基的承載力充分發(fā)揮;通過優(yōu)化設計,使土和樁分擔的荷載及沉降都達到要求的目標,從而使剛性樁復合地基的設計達到比較理想的優(yōu)化狀態(tài)。最后,通過工程案例說明該方法的實施過程。關(guān)鍵詞。樁基工程:剛性樁復合地基;優(yōu)化設計;原狀土切線模量法中圈分類號lTU47文獻標識碼lA文章編號:1000—6915(201I)04—0818—08oPTIMIZAl’IoNDESIGNoFRIGIDPILECoMPoSITEFoUNDATIoNYANGGuanghual~,LIDeji
3、l,GUANDashu3(1.GuangdongResearchInstituteofWaterResourcesandHydropower,Guangzhou,Guangdon9510610,China:2.Departmento,CivilEngineering,SouthChinaUniversi紗ofTechnology,Guangzhou,Cruangdong510641,China;3.PearlRiverHydraulicResearchInstitute,Guangzhou,Guangdong510610,China)Ab
4、stract:ThetangentmodulusmethodofundisturbedsoiliSusedtocalculatethenonlinearsettlementsofsoilfoundationandpilefoundationseparately;andthenonlinearrelationP-S(10ad-settlement)curvesofthesoilfoundationandpilefoundationareobtained.Supposingthatthesoilfoundationandpilefoundat
5、ionareactedindependently,simultaneouslyconsideringthatthesettlementsofsoilfoundationandpilefoundationareequal,thenwecanobtaintheloadactingonthesoilandpilebytheP-scurves.Then。bycontrollingthesettlementvalueandadjustingthethicknessofcushion,therelativestiffnessesofsoilandpi
6、lesCanbematchedtomakethebestuseofthebearingcapacitiesofsoilandpilefoundation;andthesettlementofthecompositefoundationCanreachthedesiredaim.Consequently,thedesignofcombinationfoundationCanreachtheperfectoptimizedcondition.Finally,theimplementationprocessofthemethodisexplai
7、nedbythecasestudy.Keywords:pilefoundationengineering:rigidpilecompositefoundation;optimizationdesign:tangentmodulusmethodofundisturbedsoil1引言復合地基是一種較理想的地基處理方法,用天然地基的承載力以達到減少造價的目的,是剛性樁復合地基,如CFG樁(水泥粉煤灰碎石樁)復合地基【11、混凝土樁復合地型21、甚至剛?cè)嵝詷督Y(jié)合或長短樁結(jié)合的三維復合地基(如CM樁復合地其利基)【31等,由于剛性樁施工質(zhì)量較可靠
8、,沉降可控,尤其將會被越來越廣泛地應用。然而,工程實踐中理想牧麓日期l2010—07—30:●目日期t2011一03一13作者蕾介t楊光華(1962一)。男.博士。1982年畢業(yè)于武漢水利電力