Page 178 - 《水资源与水工程学报》2022年第6期
P. 178
! 33 " ! 6 # & ' ( ) & * + , - Vol.33No.6
2022 $ 12 % JournalofWaterResources&WaterEngineering Dec.,2022
DOI:10.11705/j.issn.1672-643X.2022.06.22
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KLDMN:TU454;TV16 OPQRS:A OTUN:1672643X(2022)06017408
Nanoindentationexperimentalstudyonmechanicalpropertiesof
redmudstoneinHechi,GuangxiProvince
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LUOTingyi,ZHANGQingsong,LIUZhibin,TANGYasen,WANGYuting
(1.GuangxiBeitouHighwayConstructionandInvestmentGroupCo.,Ltd.,Nanning530029,China;2.Instituteof
GeotechnicalEngineering ,SchoolofTransportation,SoutheastUniversity,Nanjing210096,China)
Abstract:Inordertosystematicallycharacterizethemechanicalpropertiesofeachmineralcomponentin
theredmudstoneinHechiarea,GuangxiProvince,thenanoindentationtechnologyisusedtostudythe
mechanicalpropertiesofredmudstonesamplesunderfourpeakloads.AccordingtothetestresutsofaX
-raydiffractometer ,anopticalmicroscopeandotherinstruments,themeasurementofeachtestpointare
linkedwitheachmineralcomponentcorrespondingly.TheresultsshowthattheredmudstoneinHechiar
eaofGuangxiProvincehashighheterogeneity ,itismainlycomposedofSiO,AlO andFeO,with
2 2 3 2 3
quartz ,plagioclase,muscovite,etc.asthemainmineralcomponents.Theclaymineralsandothermin
eralcomponentsarecloselyandirregularlyarranged.Themudstoneload-indentationdepthcurveofsin
glenanoindentationtesthasahighdegreeofdiscretization ,buttheaveragemaximumindentationdepth
andplasticdeformationof12measuringpointsundereachgroupofloadpresentthesamepattern ,which
isthegreatertheload ,thegreatertheindentationdepth.Whentheloadisrelativelysmall,theelastic
modulusofeachmeasuringpointisinagoodlinearcorrelationwiththehardness.Thequartzinthemud
stonehasthehigheststrengthandthebestmechanicalproperties ,followedbyplagioclase;whereasmus
coviteandclaymineralshavetheworstmechanicalproperties.Becausetheredmudstoneischaracterized
byporousandfracturedstructure ,theaverageelasticmodulusofitsclaymineralsislowerthanthatin
othertypesofrocks ,whichisalsothereasonwhytheredmudstoneispronetofracturesandeasytodis
integrateincontactofwater.
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