CFG桩复合地基承载特性及工程应用研究的中期报告AbstractCFGpilecompositefoundationisanewtypeofpilefoundation,whichcombinestheadvantagesofCFGpileandcompositefoundation.Ithasbeenwidelyusedinengineeringpracticeduetoitsgoodbearingperformanceandeconomicbenefits.Inthispaper,thebearingcharacteristicsofCFGpilecompositefoundationarestudied,andthefactorsthataffectitsbearingcapacityareanalyzed.Themiddle-termreportanalyzestheinfluenceoftheCFGpilediameterandspacing,thecompositefoundationthicknessandthesoilphysicalparametersonthebearingcapacityoftheCFGpilecompositefoundation,andputsforwardsomeengineeringapplicationsuggestions.Keywords:CFGpile,compositefoundation,bearingcapacity,diameter,spacing,thickness摘要CFG桩复合地基是一种新型的桩基础，它将CFG桩和复合地基的优点相结合，具有良好的承载性能和经济效益，在工程实践中得到广泛应用。本文研究了CFG桩复合地基的承载特性，分析了影响其承载力的因素。中期报告分析了CFG桩直径、间距、复合地基厚度、土壤物理参数对CFG桩复合地基承载力的影响，并提出了一些工程应用建议。关键词：CFG桩，复合地基，承载力，直径，间距，厚度1IntroductionCFGpilecompositefoundationisanewtypeoffoundation,whichiscomposedofCFGpileandcompositefoundation.CFGpileisanewtypeofpile,whichisformedbyinjectingcementgroutintothesoilthroughadrillpipewithastirringscrew.Thepilehasahighbearingcapacityandgooddurability.Compositefoundationisafoundationthatcombinestheadvantagesofpilefoundationandshallowfoundation.Itiscomposedofarigidlayerandanelasticlayer,whichcannotonlyimprovethebearingcapacityofthefoundation,butalsoreducethesettlementofthefoundation.CFGpilecompositefoundationhasbeenwidelyusedinengineeringpracticeduetoitsgoodbearingperformanceandeconomicbenefits.However,thebearingcharacteristicsofCFGpilecompositefoundationareaffectedbymanyfactors,suchastheCFGpilediameterandspacing,thecompositefoundationthickness,thesoilphysicalparameters,etc.Therefore,itisnecessarytostudythesefactorsandtheirinfluenceonthebearingcapacityofCFGpilecompositefoundation.2CFGpilecompositefoundationbearingcharacteristics2.1CFGpilebearingcapacityThebearingcapacityofCFGpileisaffectedbymanyfactors,suchasthepilediameter,length,concretestrength,soilproperties,etc.Accordingtotheformulaofbearingcapacit