temperature effects on unsaturated hydraulic property of

《temperature effects on unsaturated hydraulic property of》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、JournalofWuhanUniversityofTechnology-Mater.Sci.Ed.Temperatureeffectsonunsaturatedhydraulicpropertyofbentonite-sandbufferbackfillingmixturesZHANGMingZHANGHuyuanZHOULangJIALingyan(KeyLaboratoryofmechanicsonDisasterandEnvironmentinWesternChina,Lanzhouuniversity,Lanzhou,730000,China)Abs

2、tract:Theinfluenceoftemperatureontheengineeredpropertiesofbentonite-sandmixtures(B/S)isofmajorconcerninthedesignofengineeredbarriersinundergroundrepositoriesforhigh-levelradioactivewastedisposal.Thispaperpresentsanexperimentalstudycenteredontheinvestigationoftheinfluenceoftemperatur

3、eonsoilunsaturatedhydraulicpropertiesrelatedtowaterholdingcapacityandpermeabilityofGMZB/SinChina.Thevaporequilibriummethodandwaterinfiltrationapparatuswereusedtomeasurethesoilwatercharacteristiccurve(SWCC)andunsaturatedhydraulicconductivity(ku).TheresultsshowthattheSWCCunderdifferen

4、ttemperaturefrom20℃to60℃tendtothesame.Temperatureinfluenceonunsaturatedpermeabilityismorerelevantatlowsuctions,nocleareffectisdetectedbelowadegreeofsaturationof74%,andexperimentaldatashowthattemperaturedependenceonunsaturatedpermeabilityissmall.Keywords:high-levelradioactivewastedis

5、posal;engineeredbarrier;temperature;soilwatercharacteristiccurve;unsaturatedhydraulicconductivityJournalofWuhanUniversityofTechnology-Mater.Sci.Ed.1IntroductionThebentonite-sandmixtureisoftenconsideredaspossiblebufferbackfillingmaterialsinundergroundrepositoriesforhigh-levelradioact

6、ivewastedisposal.Theinfluenceoftemperatureonunsaturatedhydraulicpropertyofclaysisveryimportantinthedesignofengineeredbarriers,asthetemperatureinthedisposalsiteisnotalwaysbeingroomtemperature[1].Agreatnumberofexperimentalstudiesdealingwiththetemperatureeffectsonengineeredpropertiesof

7、claysareavailableintheliterature.However,mostofthesestudiesfocusedonthethermodynamicproperty[2-3]oreffectoncompressibility[4],volumechange[5],saturatedhydraulicconductivity[5-6],salttranslocation[7],adsorptionproperty[8],THMprocess[9]andTHMCprocess[10].Theexperimentalresultsrelatedt

8、otemperatureeffects