Page 186 - 《水资源与水工程学报》2022年第6期
P. 186
! 33 " ! 6 # & ' ( ) & * + , - Vol.33No.6
2022 $ 12 % JournalofWaterResources&WaterEngineering Dec.,2022
DOI:10.11705/j.issn.1672-643X.2022.06.23
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KLDMN:TU411;TV32 OPQRS:A OTUN:1672643X(2022)06018207
Insituexperimentalstudyoncoefficientofearthpressureat
restofoverconsolidatedsiltyclay
1,2
2,3
CHENShufeng ,KONGLingwei ,LIHuanhuan 1
(1.ShaanxiKeyLaboratoryofSafetyandDurabilityofConcreteStructures,XijingUniversity,Xi’an710123,China;2.StateKey
LaboratoryofGeomechanicsandGeotechnicalEngineering ,InstituteofRockandSoilMechanics,ChineseAcademyofSciences,
Wuhan430071,China;3.UniversityofChineseAcademyofSciences,Beijing100049,China)
Abstract:Thecoefficientofearthpressureatrest(K ),whichisaffectedbyanumberoffactors,isan
0
importantparameterforthedesignandconstructionofgeotechnicalengineering.Choosingappropriate
methodoftestandanalysisisthekeytoensurethereliabilityofthetestresults.Toinvestigatethe K 0
characteristicsofaoverconsolidatedsiltyclaystratuminHarbinCity,aseriesofinsitutests,including
K steppedbladetest(KSB),dilatometertest(DMT),andpressuremetertest(PMT)togetherwithlabo
0
ratoryK oedometertestwereconductedandcomparativelyanalyzed.TheresultsshowedthatKSBavoi
0
dedsoildisturbanceandempiricalproblemsofconventionalpushintests ,andpossessedthevirtuesof
simplicity ,efficiencyandhighprecision.ThevalueofK obtainedfromKSBwasintherangeof0.45-
0
1.81 ,andpresentedadecreasingtrendwiththeincreaseindepth.Ontheotherhand,theK valuesfrom
0
laboratory K oedometertestandPMTwereseverelyunderestimatedduetothefactthatthereleasedinitial
0
lateralstressintheunloadingprocesscannotfullyrecoverduringthereloadingprocess.Thereliabilityof
DMTwasstronglydependentontheempiricalanalysisformulaselected.Itisfoundthatthe K valuesof
0
HarbinsoilweremarkedlyoverpredictedbytheconventionalMarchettiformula ;however,itunderestima
tedthesoilsinShanghai ,Suzhou,HangzhouandXi’an.ToestimateK ofHarbinoverconsolidatedsilty
0
clay,anovelempiricalformulawasproposedbasedonthecalibrationofMarchettiformula,whichcan
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