Page 180 - 《水资源与水工程学报》2022年第5期
P. 180
! 33 " ! 5 # & ' ( ) & * + , - Vol.33No.5
2022 $ 10 % JournalofWaterResources&WaterEngineering Oct.,2022
DOI:10.11705/j.issn.1672-643X.2022.05.22
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HIJKL:TU411 MNOPQ:A MRSL:1672643X(2022)05017607
Strengthandmicroscopicpropertiesofloesscontaminated
byorganophosphoruspesticides
WANGNing,YANGXiujuan,LIUHao,MAXingye
(CollegeofWaterResourcesandArchitecturalEngineering,NorthwestA&FUniversity,Yangling712100,China)
Abstract:Inordertostudythemechanicalpropertiesofpesticidecontaminatedsoil,theunconfined
compressivestrengthtestwascarriedoutonloessunderdifferentorganophosphoruspesticide (glyphosate,
glufosinate)contents,compactiondegrees,moisturecontentsandcuringtime.Inthemeantime,themi
crostructuralcharacteristicsofcontaminatedsoilswerealsoexplored.Theresultsshowthattheunconfined
compressivestrengthofthecontaminatedsoildecreaseswiththeincreaseofpesticidecontent ,andthein
fluenceofglyphosateonthesoilissimilartothatofglufosinate.Theunconfinedcompressivestrengthof
thecontaminatedsoilincreaseswiththeincreaseofcompactiondegreeandcuringtime ,butdecreasesand
levelsoffwiththeincreaseofmoisturecontent.Microstructuralanalysisrevealsthatpesticideintrusionin
tothesoildoesnotchangethemineralcompositionofthesoil ,butadsorbsontheclaymineralparticles
inthesoil ,andreactswiththemineralinterlayerionstoreducetheinterlayercolumnsupport.Therefore,
theadditionofpesticidesmakestheparticlesmorefragmented,increasesthenumberoflargeporesinthe
soil ,dispersestheparticlesandreducesthestrengthofthesoil.
Keywords:contaminatedloess;organophosphoruspesticide;unconfinedcompressivestrength;micro
structureproperty
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