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1、JournalofEngineeringGeology工程地質(zhì)學報1004—9665/2012/20(3)一0403—07重塑黏性土固有壓縮特性的探討木殷杰苗永紅(江蘇大學土木工程與力學學院土木工程系鎮(zhèn)江212013)摘要Burland于1990年提出重塑土的固有壓縮特性,為定量評價天然沉積結(jié)構(gòu)性黏性土的力學性質(zhì)提供參考依據(jù)。通過對四種液限的重塑土進行大量的室內(nèi)一維固結(jié)試驗,重塑土樣的初始含水率調(diào)整擴大為液限的0.7—2.0倍,探討了初始含水率,液限對重塑土固有壓縮特性的影響。結(jié)果表明:重塑土壓縮
2、曲線不僅與土的液限有關(guān),還受初始含水率的影響;在較低固結(jié)壓力下,采用Burland引入的孔隙指數(shù)不能將不同初始含水率的重塑土壓縮曲線歸一化,但當固結(jié)壓力超過約25kPa時,各種壓縮曲線均可較好地歸一化至重塑土的固有壓縮曲線(ICL);此外,重塑土固有壓縮參數(shù)并非僅與土的液限有關(guān),試驗實測的結(jié)果顯示出與Burland的固有壓縮參數(shù)經(jīng)驗有一定的偏離,結(jié)合試驗結(jié)果對其進行了修正。關(guān)鍵詞重塑黏性土初始含水率液限固有壓縮特性中圖分類號:TU411文獻標識碼:ALABoRAToRYTESTSoNINTRINS
3、ICCoMPRESSIONBEHAVIOROFRE.CoNSTITUTEDCLAYSYINJieMIAOYonghong(DepartmentofCivilEngineering,F(xiàn)acultyofCivilEngineeringandMechanics,JiangsuUniversity,Zhenjiang212013)AbstractResearchonquantitativeevaluationofthecompressionbehaviorforreconstitutedclaysusua
4、llyprovidesareferenceframeworkforinterpretingthecorrespondingcharacteristicsofnaturalsedimentaryclays.Theintrinsiccompressionline(ICL)wasproposedbyBurlandin1990.thevoidindexwasintroducedfornormalizingthecorn—pressioncurvesofvariousreconstitutedclaysha
5、vinganinitialwatercontentof1.0~1.5times(preferably1.25times)theliquidlimit.thepropertiesofreconstitutedclayswerealsotermed‘intrinsic’propertiessincetheywereinherenttothesoilandindependentofthenaturalstate.Inthispaper,extensiveoedometertestsarecarriedo
6、utonfourdifferentclays.Theyarereconstitutedandextendedto0.7~2.0timestheliquidlimits.Thetestresultssuggestthatthecompressionbehaviorforreconstitutedclaysisinfactnotthe‘intrinsic’propertiesproposedbyBurland,whichisnotonlyaffectedbysoilliquidlimitbutalso
7、affectedbysoilinitialwatercontent.AmodificationbasedonthetestdataispresentedontheexpressionsofelooandC:definedbyBurland.Extensiveoedometertestdataareal—SOcollectedonvariousreconstitutedsoilswithdistinctliquidlimitsandinitialwatercontentstoverifytheval
8、idityandapplicabilityofmodifiedexpressions.KeywordsReconstitutedclays,Initialwatercontent,Liquidlimit,Intrinsiccompressionbehavior收稿日期:2011—08—20;收到修改稿日期:2011—11—20.基金項目:江蘇大學高級專業(yè)人才科研啟動項目(10JDG079),江蘇省自然科學基金項目(BK20114Y6)資助第一作者簡介:殷杰,主要從事軟黏土基本特性、