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1、石油勘探與開發(fā)2011年10月PETROLEUMEXPL0RAT10NANDDEVELOPMENTVo1.38No.5613文章編號:1000-0747(2011)05—0613—07海上自升式鉆井平臺插樁階段樁靴承載力計算張浦陽1,2于曉洋,丁紅巖,2(1.天津大學(xué)建筑工程學(xué)院;2.濱海土木X-程結(jié)構(gòu)與安全教育部重點實驗室(天津大學(xué));3.國核電力規(guī)劃設(shè)計研究院)摘要:為了準(zhǔn)確預(yù)測海上自升式鉆井平臺插樁階段貫入深度,5l入流一固耦合理論,建立了飽和黏土條件下土一樁靴系統(tǒng)的有限元模型,利用該模型對樁靴貫入均質(zhì)與非均質(zhì)黏土?xí)r的樁靴承載力系數(shù)進(jìn)行了數(shù)值計算。結(jié)果表明,樁靴承載力系數(shù)的大小主要
2、取決于土體強度和樁靴貫入深度:對土體強度非均勻系數(shù)較低的土體,樁靴承載力系數(shù)與樁靴貫入深度正相關(guān),而土體強度非均勻系數(shù)較大的土體樁靴承載力系數(shù)與樁靴貫入深度呈負(fù)相關(guān);當(dāng)樁靴貫入深度為20m左右時,樁靴的極限承載力系數(shù)為10.30(不考慮土體回流作用)和12.25(考慮土體回流作用)。給出了插樁過程中樁靴承載力的計算方法,并利用此方法計算了渤海5號平臺在特定土質(zhì)條件下樁靴的貫入深度,提出的計算方法由于考慮了整個插樁過程中土一樁靴相互作用、土體的非線性特性、樁靴底面的端阻力和樁靴側(cè)面阻力等影響,預(yù)測的樁靴貫入深度更為合理,與傳統(tǒng)計算方法的結(jié)果相差20%左右。圖9表2參25關(guān)鍵詞:海上自升式鉆
3、井平臺;樁靴;承載力;土體回流;孔穴高度中圖分類號:TU411文獻(xiàn)標(biāo)識碼:ASpudcanbearingcapacitycalculationoftheoffshorejack-updrillingplatformduringthepreloadingprocessZhangPuyang,YuXiaoyang,DingHongyan,(1.SchoolofCivilEngineering,EanjinUniversity,Tianjin300072,China;2.KeyLaboratoryofCoastCivilStructureSafety(TiainUniversity),Mini
4、stryoyEducation,Tianjin300072,China;3.StateNuclearElectricPowerPlanningDesign&ResearchInstitute,Beijing100094,China)Abstract:Topredictthepenetrationdepthoftheofshorejack—updrillingplatformduringthepreloadingprocess,thefluid-solidcouplingtheorywasintroducedtoestablishthefiniteelementmodelofthesoil
5、—spudcansysteminsaturatedclay.Withthismodel,thespudcanbeatingcapacityfactorwasnumericallycalculatedwhenspudcanspenetratedintohomogeneousandheterogeneousclay.Theresultsshowthat,thespudcanbeatingcapacityfactorismainlydecidedbysoilstrengthandspudcanpenetrationdepth:forsoilwithlowerstrengthheterogene
6、ouscoeficient,thespudcanbearingfactorhasapositivecorrelationwiththespudcanpenetrationdepth,whileforsoilwithhigherstrengthheterogeneouscoeficients,thecorrelationisnegative.Whenthespudcanpenetrationdepthisabout20m,themaximumbearingcapacityfactorofspudcanis10.30(notconsidersoilbackflow)and12.25(cons
7、idersoilbackflow),respectively.Thecalculationmethodforspudcanbeatingcapacityduringthepreloadingprocesswasgiven.Withthismethod,thepenetrationdepthofspudcanundercertainsoilconditionfortheBohaiNo.5platformwascalculated.Be