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时间:2017-12-08
《柔性基础下桩体复合地基的解析法》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第29卷第2期岩石力学与工程学报Vol.29No.22010年2月ChineseJournalofRockMechanicsandEngineeringFeb.,2010柔性基础下桩体复合地基的解析法1,211吕文志,俞建霖,龚晓南(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310058;2.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:柔性基础、垫层、复合地基、下卧层土体的共同作用一直没有得到较好的考虑。将四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,考虑系统四部分界面上的应力与变形协调,对典型
2、单元体建立荷载传递基本微分方程并给出其解答,从而得到表征复合地基性状的沉降和桩土应力比等的求解公式;与某工程实测成果及按现行规范推荐方法计算所得结果对比表明该解答是合理的,柔性基础下桩体复合地基中的桩土荷载分担比、荷载传递机制等均与刚性基础下的复合地基不同,工程设计中要高度重视和运用等沉面和中性面的概念;最后对进一步的解析法研究提出了建议。关键词:桩基工程;柔性基础;桩体复合地基;解析法;共同作用中图分类号:TU47文献标识码:A文章编号:1000–6915(2010)02–0401–08ANALYTICALMETHODFORPILECOMPOSITEGROUNDUNDE
3、RFLEXIBLEFOUNDATION1,211LUWenzhi,YUJianlin,GONGXiaonan(1.MOEKeyLaboratoryofSoftSoilsandGeoenvironmentalEngineering,ZhejiangUniversity,Hangzhou,Zhejiang310058,China;2.KeyLaboratoryofGeotechnicalMechanicsandEngineeringofMinistryofWaterResources,YangtzeRiverScientificResearchInstitute,Wuhan,
4、Hubei430010,China)Abstract:Interactionsamongflexiblefoundation,cushion,compositeground,andunderlyingsoilshavenotbeenwellresearched.Asimplifiedanalyticalmodelispresentedconsideringtheabovefourpartsasaninteractivesystem.Themethodallowstherelativemovementbetweenpilesandsoils,andassumesdiffer
5、entsettlementsoffoundationsoilatthesamelevelplane.Theforceequilibriumsofatypicalelementareestablished.Andthen,accordingtothecompatibilityofstressanddeformationontheinterfacesbetweenthesefourcomponents,theformulasforsettlementandstressratioofpile-soil,whichareusedtocharacterizethebehaviors
6、ofthecompositeground,arederived.ComparisonsdemonstratethattheresultsfromthissolutionareinaccordancewiththemeasuredonesofaprojectinChina′sZhejiangProvince,andtheyarecloserthanthoseobtainedusingtherecommendedmethodofthecurrentcodesinChina.Thepile-soilloadratioandtheloadtransferlawofpilecomp
7、ositegroundunderflexiblefoundationaredifferentfromthoseofrigidfoundations.Moreattentionsshouldbepaidtotheconceptsofequalsettlementplaneandneutralpointplanefortheengineeringdesigns.Finally,samesuggestionsareproposedforfurtherstudyofanalyticalmethodofpilecompositegrou
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