Experimental Study on Strength Characteristics of Artificial Structured Frozen Loess

Electronic journal of geotechnical engineering

关键词: Soil mechanics;    Frozen loess;    Artificial structured soil;    Triaxial tests;    Strength behavior;   

DOI  :  

来源: Oklahoma State University

【 摘 要 】

Thestructuralcharacteristicsarethebasicattributes,whichhaveastronginfluenceonengineeringpropertiesofsoil.Theeffectofstructuralcharacteristicsonthemechanicalpropertiesoffrozenloesshasbeeninvestigated.Basedontriaxialcompressiontestsofremoldedfrozenloessandartificialstructuredfrozenloesswithdifferentcontentofcement,thispaperstudiedhowtheconfiningpressure,initialwatercontent,temperatureandthecementamountinfluencedthefrozenloess'strengthbehavior.Thetestresultsshowedthatinthesameexperiments,thereweresomedifferencesofthestress-strainrelationshipbetweentheunsaturatedandsaturatedfrozenloess.Thetemperatureandconfiningpressurewerethemainimportantfactorsthatinfluencedtheshearingstrengthsoffrozensoil.Theshearingstrengthsofunsaturatedfrozenloessareincreasingwithconfiningpressure,butthatofsaturatedfrozenloesshaslittlerelationshipwithconfiningpressure.Theinitialwatercontentisanothermainfactoraffectingthefrozenloessstrength.Astheincreaseofwatercontent,thefrozenloessstrengthisalsoincreasing,butthereisapeakpoint.Afteritthefrozenloessstrengthwoulddecreasegraduallywiththewatercontentincreasing,andthestrengthofsaturatedfrozenloessreachedthelowest.Withregardtotheunsaturatedfrozenloess,theyieldstrengthandfailurestrengtharebothincreasingwiththecontentofcement.Forthesaturatedfrozenloess,theyieldstrengthisincreasingwiththecontentofcement,too.However,thefailurestrengthhaslittlerelationshipwiththecementcontent.Thementionedfactorshaveobviousinfluenceonthestructuralcharacteristicsoffrozenloess,howeverthecementcontentandwatercontentarethedominatingfactors.Themechanicalpropertiesandstructuralcharacteristicsoffrozenloessdependonnotonlythesinglefactor,suchasconfiningpressure,initialwatercontent,temperatureandthecementamountetc.,butalsoonthepossibleinteractionbetweenthementionedfactors.Atlast,thecomprehensivecoefficientMwhichcorrelatescloselywithparametersofshearstrengthwaspresented.Byregressionanalysis,theexponentialfunctionrelationshipbetweenMandcaswellasMandtan?wasobtained.

【 授权许可】

Unknown