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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報(bào)1004-9665／2014／22(2)．0181．07吹填軟土蠕變過程中結(jié)構(gòu)強(qiáng)度變化及微觀機(jī)理分析術(shù)楊愛武①②孔令偉②(①天津市軟土特性與工程環(huán)境重點(diǎn)實(shí)驗(yàn)室天津300381)(②中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點(diǎn)實(shí)驗(yàn)室武漢430071)摘要結(jié)構(gòu)性土長期變形過程必然對(duì)土結(jié)構(gòu)產(chǎn)生影響。通過對(duì)結(jié)構(gòu)性吹填軟土進(jìn)行三軸蠕變?cè)囼?yàn)，在蠕變過程中選取有代表性時(shí)間點(diǎn)的樣品，對(duì)其進(jìn)行微觀結(jié)構(gòu)分析與結(jié)構(gòu)強(qiáng)度測試。研究結(jié)果表明，蠕變過程其實(shí)就是土體內(nèi)部結(jié)構(gòu)硬化和軟化相互轉(zhuǎn)化的過程。當(dāng)應(yīng)力水平低
2、于結(jié)構(gòu)屈服應(yīng)力時(shí)，土體的蠕變是硬化占主要部分，其微觀結(jié)構(gòu)的變化是逐漸趨于穩(wěn)定，結(jié)構(gòu)強(qiáng)度相應(yīng)增長。當(dāng)應(yīng)力水平超過結(jié)構(gòu)屈服應(yīng)力時(shí)，土體的蠕變是軟化占主要部分。該階段可細(xì)分為兩個(gè)階段，即其結(jié)構(gòu)從大量破壞階段到土體結(jié)構(gòu)最終破壞階段；微結(jié)構(gòu)卻從穩(wěn)定階段變?yōu)椴环€(wěn)定階段，最后又回到“無序”階段。關(guān)鍵詞吹填軟土蠕變結(jié)構(gòu)強(qiáng)度微觀機(jī)理中圖分類號(hào)：TU411文獻(xiàn)標(biāo)識(shí)碼：ASTRENGTHEVoLUTIoNANDMICRo．STRUCTUREMECHANICSoFSTRUCTUREDSoFTDREDGERFILLFRoMTRIAXIALCREEPTESTYANGAiwu①②K
3、ONGLingwei②(①研LaboratoryofsoftSoilEngineeringCharacterandEngineeringEnvironmentofTianjin，Tianjin300381)((~StateKeyLaboratoryofGeomechanicsandGeotechnicalEngineering，InstituteofRockandSoilMechanics，ChineseAcademyofSciences，Wuhan430071)AbstractThelong—termdeformationofstructuralso
4、ilsinevitablyaffectssoilstructure．ThroughtriaxialcreeptestforstructuralsoftdredgerfiU．themicro—mechanicsandthechangesofstructurestrengthwerestudiedbychoosingrepresentativesampleduringthecreep．Theresultsshowthattheessenceofcreepistheprocessaboutmutualtransformationbetweenhardenin
5、gandsofteningoftheinternalstructureofsoil．Whenthestresslevelislessthanthestructureyieldstress，thehardeningaccountsforthemainportionintheprocessofcreep，andthechangeofmicro-structureisgraduallystabilized．thestructurestrengthincreasesaccordingly．Thesofteningaccountsf0rthemainportio
6、nintheprocessofcreepwhenthestresslevelexceedsthestructureyieldstress．Thisstagecanbesubdividedintotwostages．Theyaretheheavysoilstructuredestructionstageandthesoilultimatefailurestage．Themicro-structureischangedfromthestablestagetotheunstablestage，eventuallybacktothedisorderstage．
7、KeywordsSoftdredgerfill，Creep，Structurestrength，Micro—mechanics收稿日期：2013-03-22；收到修改稿日期：2014-03-06．基金項(xiàng)目：國家自然科學(xué)基金項(xiàng)目(5117918641372291)資助．第一作者簡介：楊愛武，男，博士，教授，國家注冊(cè)土木工程師(巖土)，從事軟土地基處理及土體微觀結(jié)構(gòu)研究．Email：Tulilab@163．tom182JournalofEngin2eringGeology工程地質(zhì)學(xué)報(bào)2014181引言1614目前單獨(dú)對(duì)吹填土體結(jié)構(gòu)性以及軟土微細(xì)觀蠕＼lOs
8、變特性的研究成果均有涉及，如劉瑩等_1J、劉娉慧倒6等_2J、詹良通等分別對(duì)固結(jié)沉積、外加劑加
