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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礎(chǔ)下復(fù)合地基性狀研究2012年全國(guó)高考模擬參考部分基于上下部共同作用的柔性基礎(chǔ)下復(fù)合地基性狀研究俞建霖1,荊子菁1,龔曉南1,劉超1,2,呂文志1,3(1.浙江大學(xué)軟弱土與環(huán)境土工教育部重點(diǎn)實(shí)驗(yàn)室,浙江杭州310027;2.山東電力工程咨詢?cè)海綎|濟(jì)南250013;3.長(zhǎng)江科學(xué)院水利部巖土力學(xué)與工程重點(diǎn)實(shí)驗(yàn)室,湖北武漢430010)摘要:根據(jù)路堤荷載下復(fù)合地基的變形特征,將柔性基礎(chǔ)下復(fù)合地基分解為填土、墊層、復(fù)合地基、下臥層土體4部分。將4者作為一個(gè)共同作用的系統(tǒng),假設(shè)樁土界面之間存在相對(duì)滑移且同一水平面上地基土沉降不同,考慮系統(tǒng)4部分交界面
2、上的應(yīng)力與變形協(xié)調(diào),通過(guò)對(duì)典型單元體的分析,推導(dǎo)了表征柔性基礎(chǔ)下復(fù)合地基性狀的樁土應(yīng)力比和沉降變形的求解公式。最后將工程實(shí)測(cè)結(jié)果和本文方法分析的結(jié)果進(jìn)行對(duì)比,二者基本一致,說(shuō)明本文方法能較好反映柔性基礎(chǔ)下復(fù)合地基的工作性狀。關(guān)鍵詞:柔性基礎(chǔ)下復(fù)合地基;解析解;荷載傳遞;相對(duì)滑移中圖分類號(hào):TU47文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000–4548(2010)05–0657–07作者簡(jiǎn)介:俞建霖(1972–),男,福建福清人,博士,副教授,碩士生導(dǎo)師,主要從事軟黏土力學(xué)、地基處理及基坑工程等方面的研究與教學(xué)工作。E-mail:yujianlin72@126.com。Workingbehaviors
3、ofcompositegroundunderflexiblefoundationbasedonsuper-substructureinteractionYUJian-lin1,JINGZi-jing1,GONGXiao-nan1,LIUChao1,2,LüWen-zhi1,3(1.KeyLaboratoryofSoftSoilsandGeoenvironmentalEngineeringofMinistryofEducation,ZhejiangUniversity,Hangzhou310027,China;2.ShandongElectricPowerEngineeringConsul
4、tingInstitute,Jinan250013,China;3.MWRKeyLaboratoryofGeotechnicMechanicsandEngineering,YangtzRiverScientificResearchInstitute,Wuhan430010,China)Abstract:Basedonthedeformationcharacteristicsofcompositegroundundertheflexiblefoundation,thecompositegroundisdividedintofourparts,includingfill,cushion,co
5、mpositefoundation,andunderlyinglayer.Throughtheanalysisofatypicalelement,asimplifiedanalyticalmodel,whichconsiderstheabovefourpartsasaninteractivesystem,allowsfortherelativemovementbetweenpilesandsoilsandassumesdifferentsettlementsoffoundationsoilatthesamelevelplane,ispresented.Andthenaccordingto
6、thecompatibilityofstressanddeformationontheinterfacesbetweenthesefourcomponents,theformulasonsettlementandstressratioofpile-soil,whichisusedtocharacterizethebehaviorsofthecompositeground,arederived.Finally,itisdemonstratedthattheresultsfromthissolutionareinaccordancewiththemeasuredonesofaproject.
7、Sotheproposedmethodcanreflecttheworkingbehaviorsofcompositegroundundertheflexiblefoundationfavorably.Keywords:compositegroundunderflexiblefoundation;analyticalsolution;loadtransfer;relativemovement7第5期俞建霖,等.基于上下部共同作用的柔