Page 194 - 《水资源与水工程学报》2023年第1期
P. 194

!34 " ! 1 #                       & ' ( ) & * + , -                               Vol.34No.1
               2023 $ 2 %               JournalofWaterResources&WaterEngineering                 Feb.,2023

            DOI:10.11705/j.issn.1672-643X.2023.01.23


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                 FGHIJ:TU452;TV16   KLMNO:A    KPQJ:1672643X(2023)01019009

                            Energyevolutioncharacteristicsofdeepburiedmarble
                                       undertriaxialloadingandunloading

                                1
                                                               1
                                                                                         1
                                                                             1
                                              2,3
                     LIHongying,LIUXiaohui ,XIAOWengen,ZHENGYu,XUEYang,GUIXin                      1
              (1.SchoolofEnergyandPowerEngineering,XihuaUniversity,Chengdu610039,China;2.KeyLaboratoryofFluidandPower
                Machinery ,MinistryofEducation,XihuaUniversity,Chengdu610039,China;3.KeyLaboratoryofDeepEarthScienceand
                              Engineering(SichuanUniversity),MinistryofEducation,Chengdu610065,China)
                 Abstract:Inordertostudythedeformationandfailurecharacteristicsofthedeepburiedmarbleinthe
                 wholeprocessofloadingandunloading ,theMTSrockmechanicaltestingsystemwasusedtocarryout
                 triaxialloading-unloadingtestswiththreedifferentinitialconfiningpressuresof25 ,50and80MPa,
                 andthreedifferentunloadingratesof0.01,0.1and1MPa/sonthedeepburiedmarbleinJinping.The
                 energyconversionparameterwasintroducedtobettercharacterizetheenergyconversioncharacteristics
                 beforeandafterthestresspeak.Then ,adamagemodelbasedondissipatedenergywasconstructedinor
                 dertofurtherexplorethedamageevolutionstateofdeepburiedmarbleduringthewholeprocessofload
                 ingandunloadingfailure.Theresearchresultsshowthatbeforetheunloadingsection ,itismainlythee
                 lasticenergythataccumulatesinthemarble ;aftertheunloadingstarts,thedissipativeenergybecomes
                 dominant. U dissipationrate>U dissipationrate>U storagerateduringprepeakunloadingprocess,
                           d
                                                               e
                                             3
                 thestrainenergyconversionrateattheprepeakunloadingsectioninthemarbleismuchhigherthanthat
                 undertheconventionaltriaxialloading.Furthermore,thetransformationrateofeachstrainenergyinthe
                 postpeakstressdropsectionissignificantlylargerthanthatintheprepeakunloadingsection ,indicating
                 thatthepostpeakmarblehoopexpansionisintensified ,andtheelasticenergyisrapidlyreleasedafter

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