Page 206 - 《水资源与水工程学报》2022年第3期
P. 206
!33 " ! 3 # & ' ( ) & * + , - Vol.33No.3
2022 $ 6 % JournalofWaterResources&WaterEngineering Jun.,2022
DOI:10.11705/j.issn.1672-643X.2022.03.26
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8IBJK:TU411 LMNOP:A LQRK:1672643X(2022)03020207
Influenceofloessstructuralparametersonunconfinedcompressivestrength
inYan ’anNewArea
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WANGBo,HUANGRui,HUANGXuefeng ,QIUMingming,WANGHan 1
(1.SchoolofCivilEngineering,LanzhouUniversityofTechnology,Lanzhou730050,China;2.ChinaAviationPlanning,Designand
ResearchInstituteCo. ,Ltd.,Beijing100101,China;3.SchoolofRiverandOceanEngineering,ChongqingJiaotongUniversity,
Chongqing400074,China;4.DepartmentofMilitaryInstallationsEngineering,ArmyLogisticsUniversityofPLA,Chongqing
401311,China;5.CollegeofArchitecturalandCivilEngineering,Yan’anUniversity,Yan’an716000,China)
Abstract:Inordertostudytheinfluenceofthestructureofhighfillloessonitsstrengthanddeformation
characteristicsunderunconfinedcompression,takingtheloessofahighfillsiteinYan’anNewAreaas
theresearchobject,wecarriedoutaseriesofunconfinedcompressivestrengthtestsofundisturbedloess
andremoldedloessunderdifferenttestconditions.Weinvestigatedtheinfluenceofwatercontentand
compactnessonthechangelawandmechanicalpropertiesoftheloessstructure ,andthenestablisheda
mathematicalmodelthatcanreflecttheinterplaybetweentheinitialstructuralparametersandcompressive
strengthofundisturbedloessandremodeledloess.Thefindingsshowthatwiththeincreaseofwatercon
tentorthedecreaseofcompactness ,thestress-straincurveoftheloesschangesfrom“steep”to“sta
ble ”,thepeakcharacteristicstrengthdecreasesandmovesbacktowardstheendofthecurve;however,
thepeakpointofstructuralparameterstraincurvedecreasesandmovesforward.Theplasticityindexcan
beusedasacriticalvalueindicatorthataffectstheinitialstructuralparameterchange,whenthewater
contentislessthanthevalueofplasticlimit,asmallstraincanleadtostructuralenhancementandvice
versa.Withtheincreaseofwatercontent ,theinitialstructuralparameterdecreasesnonlinearlybutthe
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