Page 140 - 《水资源与水工程学报》2022年第1期
P. 140
!33 " ! 1 # & ' ( ) & * + , - Vol.33No.1
2022 $ 2 % JournalofWaterResources&WaterEngineering Feb.,2022
DOI:10.11705/j.issn.1672-643X.2022.01.19
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BCDEF:TV131 GHIJK:A GLMF:1672643X(2022)01013608
Transienthydrauliccharacteristicsofradiationflowinaparallel
singlefractureconsideringwallslipeffect
1
2
2
2
DUWanjun,CHAIJunrui,XUZengguang,CAOCheng
(1.YanglingVocational&TechnicalCollege,Yangling712100,China;2.StateKeyLaboratoryofEcohydraulics
inNorthwestAridRegionofChina ,Xi’anUniversityofTechnology,Xi’an710048,China)
Abstract:Inordertostudythemesohydrauliccharacteristicsofradiationflowinaparallelsinglefrac
ture ,ak- ε calculationmodelbasedonturbulenceRANSisestablished.Thesimulationresultsshowthat
theradiationflowintheparallelsinglefracturepresentsthecharacteristicsof“atypicalradiationflow”,
andapreferentialhydraulicchannelisusuallyformed;becausetheevolutionofthevorticesnarrowsthe
flowchannel ,theclosertothepreferentialhydraulicchannelortheradiationcenter,thestrongertheflow
velocityandvortexintensitybecome ;theriseofwaterpressureattheradiationcenterleadstothein
creaseoffractureflow,andtheearlierthepreferentialhydraulicchannelisformedandmorestableitis,
thewiderthefracturebecomeandthemoresignificanttheturbulenceeffectofthefractureis,butthe
fractureflowisdominatedbyradialturbulence;thefracturecontactsurfaceredistributesthepreferential
hydraulicchannel ,whichdecreasestheseepageabilityofthefracture,andthecontactrateisnegatively
correlatedwiththefractureflow;thewallslipcanbeeitherobstructiveorbeneficialtothefractureflow,
dependingonthedirectionandvelocityoftheslip.Itisfoundthattheinletwaterpressure,fracture
width ,contactrateandwallsliphaveasignificanteffectontheradiationflow,andthesefindingscan
provideareferenceforthestudyofradiationflowincomplexfractures.
Keywords:parallelsinglefracture;atypicalradiationflow;transienthydrauliccharacteristics;dominant
hydraulicchannel;wallslipeffect
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