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1、JournalofEngineeringGeology工程地質(zhì)學(xué)報1004-9665/2014/22(6.1052.06DOI:10.13544/j.cnki.jeg.2014.06.006考慮初始結(jié)構(gòu)性影響的吹填軟土應(yīng)力應(yīng)變關(guān)系:l:楊愛武①②張兆杰①孔令偉②(①天津城建大學(xué)天津市軟土特性與工程環(huán)境重點實驗室天津300384)(②中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點實驗室武漢430071)摘要正常沉積的土體一般具有結(jié)構(gòu)性。目前土的本構(gòu)模型大多數(shù)是以非結(jié)構(gòu)性土為基礎(chǔ)建立和發(fā)展起來的,用它們直接描述結(jié)構(gòu)性土體應(yīng)力應(yīng)變關(guān)系與實際出入很大。本文以修正的劍
2、橋模型為基礎(chǔ),建立了可考慮初始結(jié)構(gòu)性影響的結(jié)構(gòu)性吹填軟土應(yīng)力應(yīng)變關(guān)系。與修正的劍橋模型相比,只增加了參數(shù)的個數(shù),但參數(shù)種類不變,其值通過室內(nèi)常規(guī)試驗即可求得。對天津濱海新區(qū)吹填場地經(jīng)過真空預(yù)壓處理后有結(jié)構(gòu)強(qiáng)度的吹填土體進(jìn)行了三軸試驗,通過試驗值與模擬值分析比較,初步驗證了本文建立的模型可以考慮吹填軟土初始結(jié)構(gòu)性影響。關(guān)鍵詞吹填軟土初始結(jié)構(gòu)性修正劍橋模型結(jié)構(gòu)屈服應(yīng)力應(yīng)力應(yīng)變關(guān)系中圖分類號:P642.131文獻(xiàn)標(biāo)識碼:ASTRESS-STRAINRELATIoNSHIPoFSoFTDREDGERFILLWITHoRIGINALSTRUCTUREYANGAiwu①②Z
3、HANGZha0iie①KONGLingwei②(①TianfinChengfianUniversity,KeyLaboratoryofSoftSoilCharacteristicsandEngineeringEnvironmentofTianjin,Tianjin300384)((~StateKeyLaboratoryofGeomechanicsandGeotechnicalEngineering,InstituteofRockandSoilMechanics,ChineseAcademyofSciences,Wuhan430071)AbstractNorma
4、lsedimentarysoilgenerallyhasthecharacteristicsoforiginalstructures.UptonOW,themostsoilconstitutivemodelsaredevelopedandbuiltupbasedonthenon—structuresoils.Iftheyaredirectlyusedtodescribestress—strainrelationsofstructuresoils,agreatdifferencecanbeproducedbetweenthemeasuredvalueandthec
5、alculatedvalue.ThispaperisbasedonthemodifiedCambridgemode1.Thestress—strainrelationshipisestablishedconsideringtheinfluenceoforiginalstructurepropertyofthestructuralsoftdredgerfil1.ComparedwiththemodifiedCambridgemodel,thenewmodelonlyincreasesthenumberofparameters.Theycanbeobtainedth
6、roughtheconventionaltriaxialtest.Thetypesofparametersareunchanged.ThetriaxialcompressiontestareconductedofthestructuraldredgerfillwhicharetreatedbyvacuumpreloadingmethodinTianjinBinhainewarea.Comparedwiththetestvalueandthesimulationvalue,thenewmodelcanconsidertheeffectoforiginalstruc
7、turalimpact.KeywordsSoftdredgerfill,Originalstructure,ModifiedCambridgemodel,Structureyieldstress,Stress—strainrelationship收稿日期:2013-06—10;收到修改稿日期:2014-02—18.基金項目:國家自然科學(xué)基金項目(51179186,41372291)和天津市科技發(fā)展計劃項目(06YFSZSF04000)資助.第一作者簡介:楊愛武(1971-),男,博士,教授,從事軟土地基處理及土體微觀結(jié)構(gòu)研究.Email:Tulilab@163.
8、tom22(6)楊愛武等