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:1672643X(2023)01019009
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:Inordertostudythedeformationandfailurecharacteristicsofthedeepburiedmarbleinthe
wholeprocessofloadingandunloading ,theMTSrockmechanicaltestingsystemwasusedtocarryout
triaxialloading-unloadingtestswiththreedifferentinitialconfiningpressuresof25 ,50and80MPa,
andthreedifferentunloadingratesof0.01,0.1and1MPa/sonthedeepburiedmarbleinJinping.The
energyconversionparameterwasintroducedtobettercharacterizetheenergyconversioncharacteristics
beforeandafterthestresspeak.Then ,adamagemodelbasedondissipatedenergywasconstructedinor
dertofurtherexplorethedamageevolutionstateofdeepburiedmarbleduringthewholeprocessofload
ingandunloadingfailure.Theresearchresultsshowthatbeforetheunloadingsection ,itismainlythee
lasticenergythataccumulatesinthemarble ;aftertheunloadingstarts,thedissipativeenergybecomes
dominant. U dissipationrate>U dissipationrate>U storagerateduringprepeakunloadingprocess,
d
e
3
thestrainenergyconversionrateattheprepeakunloadingsectioninthemarbleismuchhigherthanthat
undertheconventionaltriaxialloading.Furthermore,thetransformationrateofeachstrainenergyinthe
postpeakstressdropsectionissignificantlylargerthanthatintheprepeakunloadingsection ,indicating
thatthepostpeakmarblehoopexpansionisintensified ,andtheelasticenergyisrapidlyreleasedafter
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