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1、7第5期俞建霖,等.基于上下部共同作用的柔性基础下复合地基性状研究基于上下部共同作用的柔性基础下复合地基性状研究俞建霖1,荆子菁1,龚晓南1,刘超1,2,吕文志1,3(1.浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310027;2.山东电力工程咨询院,山东济南250013;3.长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010)摘要:根据路堤荷载下复合地基的变形特征,将柔性基础下复合地基分解为填土、垫层、复合地基、下卧层土体4部分。将4者作为一个共同作用的系统,假设桩土界面之间存在相对滑移且同一水平面上地基土沉降不同,考虑系统4部分交界面上的应力与变形协
2、调,通过对典型单元体的分析,推导了表征柔性基础下复合地基性状的桩土应力比和沉降变形的求解公式。最后将工程实测结果和本文方法分析的结果进行对比,二者基本一致,说明本文方法能较好反映柔性基础下复合地基的工作性状。关键词:柔性基础下复合地基;解析解;荷载传递;相对滑移中图分类号:TU47文献标识码:A文章编号:1000–4548(2010)05–0657–07作者简介:俞建霖(1972–),男,福建福清人,博士,副教授,硕士生导师,主要从事软黏土力学、地基处理及基坑工程等方面的研究与教学工作。E-mail:yujianlin72@126.com。Workingbehaviorso
3、fcompositegroundunderflexiblefoundationbasedonsuper-substructureinteractionYUJian-lin1,JINGZi-jing1,GONGXiao-nan1,LIUChao1,2,LÜWen-zhi1,3(1.KeyLaboratoryofSoftSoilsandGeoenvironmentalEngineeringofMinistryofEducation,ZhejiangUniversity,Hangzhou310027,China;2.ShandongElectricPowerEngineering
4、ConsultingInstitute,Jinan250013,China;3.MWRKeyLaboratoryofGeotechnicMechanicsandEngineering,YangtzRiverScientificResearchInstitute,Wuhan430010,China)Abstract:Basedonthedeformationcharacteristicsofcompositegroundundertheflexiblefoundation,thecompositegroundisdividedintofourparts,includingfi
5、ll,cushion,compositefoundation,andunderlyinglayer.Throughtheanalysisofatypicalelement,asimplifiedanalyticalmodel,whichconsiderstheabovefourpartsasaninteractivesystem,allowsfortherelativemovementbetweenpilesandsoilsandassumesdifferentsettlementsoffoundationsoilatthesamelevelplane,ispresente
6、d.Andthenaccordingtothecompatibilityofstressanddeformationontheinterfacesbetweenthesefourcomponents,theformulasonsettlementandstressratioofpile-soil,whichisusedtocharacterizethebehaviorsofthecompositeground,arederived.Finally,itisdemonstratedthattheresultsfromthissolutionareinaccordancewit
7、hthemeasuredonesofaproject.Sotheproposedmethodcanreflecttheworkingbehaviorsofcompositegroundundertheflexiblefoundationfavorably.Keywords:compositegroundunderflexiblefoundation;analyticalsolution;loadtransfer;relativemovement7第5期俞建霖,等.基于上下部共同作用的柔性基础下复合地基性状研究0引言