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1、第29卷第2期巖石力學與工程學報Vol.29No.22010年2月ChineseJournalofRockMechanicsandEngineeringFeb.,2010柔性基礎下樁體復合地基的解析法1,211呂文志,俞建霖,龔曉南(1.浙江大學軟弱土與環(huán)境土工教育部重點實驗室,浙江杭州310058;2.長江科學院水利部巖土力學與工程重點實驗室,湖北武漢430010)摘要:柔性基礎、墊層、復合地基、下臥層土體的共同作用一直沒有得到較好的考慮。將四者作為一個共同作用的系統(tǒng),假設樁土界面之間存在相對滑移且同一水平面上地基土沉降不同,考慮系統(tǒng)四部分界面上的應力與變形協(xié)調,對典型
2、單元體建立荷載傳遞基本微分方程并給出其解答,從而得到表征復合地基性狀的沉降和樁土應力比等的求解公式;與某工程實測成果及按現行規(guī)范推薦方法計算所得結果對比表明該解答是合理的,柔性基礎下樁體復合地基中的樁土荷載分擔比、荷載傳遞機制等均與剛性基礎下的復合地基不同,工程設計中要高度重視和運用等沉面和中性面的概念;最后對進一步的解析法研究提出了建議。關鍵詞:樁基工程;柔性基礎;樁體復合地基;解析法;共同作用中圖分類號:TU47文獻標識碼:A文章編號: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