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1、第25卷第5期巖石力學(xué)與工程學(xué)報Vol.25No.52006年5月ChineseJournalofRockMechanicsandEngineeringMay，2006應(yīng)力水平對結(jié)構(gòu)性軟黏土靜力和動力變形特性影響的試驗研究陳云敏，陳穎平，黃博(浙江大學(xué)巖土工程研究所，浙江杭州310027)摘要：采用原狀和重塑軟黏土樣進行測量剪切波速的壓縮試驗及循環(huán)三軸試驗，結(jié)果表明：在靜荷載作用下，原狀軟黏土的變形特性隨應(yīng)力水平變化均可分為3個階段，這3個階段以先期固結(jié)應(yīng)力和結(jié)構(gòu)屈服應(yīng)力為分界點，利用剪切波速可簡單、方便地
2、判定出這2個關(guān)鍵應(yīng)力值；重塑軟黏土的變形規(guī)律與應(yīng)力水平無關(guān)。對土體施加循環(huán)荷載時，兩種土在不同固結(jié)應(yīng)力下的應(yīng)變–振次關(guān)系曲線上均存在著一個轉(zhuǎn)折點，施加的動應(yīng)力幅值不同，轉(zhuǎn)折點應(yīng)變也不相同，但該應(yīng)變與相應(yīng)的破壞振次呈線性關(guān)系。對于原狀軟黏土樣，其轉(zhuǎn)折點應(yīng)變–破壞振次關(guān)系分3個階段變化，且與壓縮試驗的3個階段具有良好的對應(yīng)關(guān)系；對于重塑軟黏土樣，其線性關(guān)系基本不隨應(yīng)力水平變化而變化；當(dāng)原狀土結(jié)構(gòu)破壞后，兩種土樣的變形規(guī)律趨于一致。關(guān)鍵詞：土力學(xué)；結(jié)構(gòu)性軟黏土；應(yīng)力水平；剪切波速；循環(huán)荷載；應(yīng)變中圖分類號：TU4
3、3文獻標(biāo)識碼：A文章編號：1000–6915(2006)05–0937–09EXPERIMENTALSTUDYONINFLUENCESOFSTATICANDCYCLICDEFORMATIONSONSTRUCTURALSOFTCLAYWITHSTRESSLEVELCHENYunmin，CHENYingping，HUANGBo(InstituteofGeotechnicalEngineering，ZhejiangUniversity，Hangzhou，Zhejiang310027，China)Abstract：
4、Thispaperpresentstheresultsofanexperimentalinvestigationperformedtostudytheinfluencesofstaticandcyclicdeformationsonundisturbedandremoldedsoftclaysampling.Thetestsindicatethatthedeformationofundisturbedsoftclaychangingwithstresslevelcouldbedividedintothree
5、stages.Thepreconsolidationandstructuralyieldingstressarethecut-offpointofthesethreestagesandtheycouldbedeterminedbyshearwavevelocitymeasurement.Thedeformationcharacteristicofremoldedclayisalmostindependentofstresslevel.Whencarryingoutcyclictriaxialtests，th
6、estraincurveswithcyclenumberofnaturalandremoldedsoftclayhaveallturningpointsunderdifferentamplitudesofstress.Beforetheturningpointsappear，thestraindevelopsslowlyandkeepstoasmalllevel.Butaftertheturningpointsappear，thestraindevelopsquicklyandbecomeslargefin
7、ally.Thestrainatturningpointschangedwithdifferentstressamplitudes，buttheyalmostfallonasamelineandcouldbefittedbyalinearequation.Thechangeoffittingparametersofnaturalsoftclaycouldalsobedividedintothreestageswhichcorrespondwelltoconsolidationtests.Andsimilar
8、ly，thefittingparametersofremoldedsoftclayalmostdidnotchangewithstresslevel.Thedeformationcharacteristicofthesetwokindsofsoftclaystendstobeconsistentwhenthestructureofnaturalsoftclayisdamaged.Keywords：soilmech
