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:1672643X(2022)06017408
                      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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