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1、河北工程大学硕士学位论文CFG桩复合地基沉降计算方法研究姓名：贾志刚申请学位级别：硕士专业：结构工程指导教师：吴雄志20070401摘要摘要采用复合地基的目的通常是提高地基承载力和（或）减小地基的沉降量。因此，复合地基的承载力及沉降理论是复合地基技术的重要理论，也是复合地基设计的依据。然而目前复合地基沉降计算理论远远落后于工程实践。本文以CFG桩复合地基为研究对象，从桩、桩间土、褥垫层三者相互作用的角度探讨了复合地基沉降计算的问题。针对CFG桩复合地基沉降计算，本文提出了如下思路：通过对桩间土及桩土接触面力学特性进行分析，根据CFG桩复合地基变形特征，提出复合地基中桩土应力比应该分三
2、个阶段来考虑。这三个阶段分别为桩间土处于弹性、弹塑性及全塑性状态，与之相对应的复合地基受力状态分别为小荷载工作状态、正常工作状态及极限工作状态。据此建立简化桩土体系力学模型，进而建立可考虑桩、土、垫层协调变形的微分方程组，推导桩土应力比理论解。在明确了桩土荷载分担的情况后，再根据假定的桩侧阻力分布形式通过Mindlin位移解求解复合地基沉降。最后，通过工程实例中现场实测与理论计算的比较，验证该方法的合理性和有效性。关键词：复合地基；CFG桩；沉降计算；桩土相互作用；Mindlin位移解IAbstractAbstractCompositefoundationisgenerallyuse
3、dtoimprovethebearingcapacityand(or)decreasethefoundationsettlement.Therefore,thebearingcapacityandsettlementtheoryareveryimportanttheoryincompositefoundation,andtheyarealsothebasisforthedesign.However,thecurrentcompositefoundationsettlementtheorylagsfarbehindtheengineeringpractice.ToCFGpilecomp
4、ositefoundationforthestudy,thispaperdiscussesthecompositefoundationsettlementcomputationproblemsviatheinteractionofpiles,pile-soil,andcushion.InordertocalculateCFGcompositefoundationsettlement,thispaperputsforwardthefollowingideas:throughthemechanicalpropertiesanalysisofsoilsurroundingpilesandp
5、ile-soilsurface,andtheCFGcompositefoundationdeformationcharacteristics,pile-soilstressratioshouldbeanalyzedunderthreephases.Elastic,elastic-plastic,andallplasticsoilexpressthatthecompositefoundationworksunderlittle,normalandultimateload.Basedonthis,asimplifiedmechanicalmodelofsoil-pilesystemise
6、stablished,whichinturnmayconsiderpile,soil,cushiondeformationdifferentialequations.Theoreticalsolutionsarededuced.Afterobtainingpile-soilloadshare,assumingdistributionbehaviorofskinfriction,thecompositefoundationsettlementbytheMindlindisplacementsolutionsarecalculated.Throughcomparingtothemeasu
7、redresultsandtheoreticalcalculation,theresultsshowthatthemethodinthispaperiseffectiveandrationality.Keywords:CompositeFoundation;CFGPile;SettlementsComputation;Pile-soilInteraction;MindlinDisplacementSolutionII独创性声明本人郑重声明：所呈交的学位论文
