低标号混凝土芯砂石桩复合地基固结一般解

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1、第30卷第11期Vol.30No.11工程力学2013年11月Nov.2013ENGINEERINGMECHANICS127文章编号：1000-4750(2013)11-0127-09低标号混凝土芯砂石桩复合地基固结一般解1112俞缙，戚志博，蔡燕燕，关云飞(1.华侨大学岩土工程研究所，福建，厦门361021；2.南京水利科学研究院岩土工程研究所，江苏，南京210024)摘要：CCSG桩(低标号混凝土芯砂石桩)复合地基是一种新型多元复合地基，为研究其固结性状，基于等应变假设和应力集中效应，建立可考虑涂

2、抹区水平渗透系数变化、砂石壳内径向渗流和混凝土芯桩不排水特点的固结分析模型，推导了CCSG桩复合地基固结一般解。现有的Terzaghi一维固结解和普通复合地基固结解是该文解的特例。根据该文理论公式编制计算程序，获得了在涂抹区水平渗透系数3种变化模式下和各无量纲参数变化时，CCSG桩复合地基的平均固结度曲线。分析结果表明：涂抹区水平渗透系数变化和各无量纲参数的变化对CCSG复合地基固结影响显著。通过和由实测数据获得的固结度曲线对比，验证了该文理论解的正确性。关键词：CCSG桩；复合地基；固结一般解；涂抹

3、区；水平渗透系数中图分类号：TU433;TU473.1文献标志码：Adoi:10.6052/j.issn.1000-4750.2012.06.0424STUDYONTHEGENERALSOLUTIONFORTHECONSOLIDATIONOFLOW-GRADECONCRETE-COREDSAND-GRAVELPILECOMPOSITEFOUNDATION1112YUJin，QIZhi-bo，CAIYan-yan，GUANYun-fei(1.GeotechnicalEngineeringInstitut

4、e,HuaqiaoUniversity,Xiamen,Fujian361021,China；2.GeotechnicalEngineeringDepartment,NanjingHydraulicResearchInstitute,Nanjing,Jiangsu210024,China)Abstract:Basedontheassumptionofequalstrainandstressconcentrationeffect,amodelwasbuilttostudytheconsolidationb

5、ehaviorsofCCSG(low-gradeconcrete-coredsand-gravel)pilecompositefoundation,whichisanewmulti-componentcompositefoundation.Thecoefficientsofthehorizontalpermeabilityinthesmearzone,theradialflowinsidethesand-gravelshellandtheundrainedpropertyofconcrete-core

6、dpileweretakenintoaccounttoderivethegeneralanalyticalsolutionforconsolidation.TheresultsshowthattheTerzaghione-dimensionalconsolidationsolutionandtheconsolidationanalyticalsolutionofordinarycompositefoundationwerespecialcasesofthissolution.Curvesoftheav

7、erageconsolidationdegreeofthecompositefoundationunderthreehorizontalpermeabilitycoefficientsinthesmearzoneandvariousnon-dimensionalparameterswereobservedusingtheprogrambasedonthetheoreticalformula.Theanalyzedresultshowsthattheconsolidationofcompositefou

8、ndationwaslargelyeffectedbythechangesinthehorizontalcoefficientsofpermeabilityinthesmearzoneandnon-dimensionalparameters.Theanalyticalsolutionwasfinallyvalidatedwiththeactualmeasurementdata.Keywords:low-gradeconcrete-coredsand-gr