Page 183 - 《水资源与水工程学报》2022年第2期
P. 183

!33 " ! 2 #                       & ' ( ) & * + , -                               Vol.33No.2
               2022 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2022

            DOI:10.11705/j.issn.1672-643X.2022.02.24


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                 EFG: D„N{; U{“c; Þ%ëI; Ðâ)µ; •Žš›
                 HIAJK:TV223.1;TU458   LMNOP:A    LQRK:1672643X(2022)02017907
              Experimentalstudyondeterioratingcharacteristicsofmetamorphicsandstone

                     mechanicalparametersundertheeffectofwetting-dryingcycles

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                                                1
                          WANGWei,GUFeng,HELiu,LIUZhao,CAOTing,LIGuoqing
                     (1.PowerChinaChengduEngineeringCorporationLimited,Chengdu610072,China;2.FacultyofGeosciences
                            andEnvironmentalEngineering ,SouthwestJiaotongUniversity,Chengdu611756,China)
                 Abstract:Inordertostudytheinfluenceofwetting-dryingcyclesonthemechanicalparametersofmet
                 amorphicsandstone,thedeterioratingcharacteristicsandmechanismofmajorrockmechanicalparameters
                 intheprocessofwetting-dryingcycleswerestudiedbylaboratorytest.Theresultsdemonstratethatthe
                 numberofcyclesisnegativelycorrelatedwiththechangesofuniaxialcompressivestrength ,elasticmodu
                 lus ,tensilestrength,cohesionandinternalfrictionangle,butpositivelycorrelatedwiththechangesof
                 Poisson ’sratio;intheinitialstageofthecycles,thechangerateofeachmechanicalparameterisfast,
                 butitstabilizeswiththeincreaseofthecycles.AccordingtotheanalysisofthedeterioratingdegreeDaf
                 ter28cycles,thesensitivitydegreeofwetting-dryingcyclestovariousmechanicalparametersisasfol
                 lows :Poisson’sratio>tensilestrength>cohesion>elasticmodulus>internalfrictionangle>compres
                 sivestrength.Theanalysisofrockmicrostructurechangesintheprocessofthewetting-dryingcycles
                 showthatthemaincausesofrockmechanicaldamageinthisexperimentarethedissolutiondissipationof
                 easilyhydrolyzedminerals ,theexpansionofdissolutionfissuresandthesheddingofdissolutiondebris
                 particles.Theregressionmodelofmechanicalparametersthatchangewiththenumberofcycleswases
                 tablished ,anditsreliabilitywasverified.Basedonthetestresultsandmodelanalysis,itisbelievedthat
                 therockmechanicalparameterstendtostabilizeafter16cycles ,sothisnumberofcyclesisrecommended
                 fortheselectionofmechanicalparametersinengineeringdesign.

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