Page 84 - 2023年第54卷第5期
P. 84
Studyonone - dimensionalringunitmodelfordeterminingthe
permeabilitycoefficienttensoroffracturedrockmasses
WANGJunqi,WANGZhigang
(SchoolofWaterResourcesandHydropowerEngineering,NorthChinaElectricPowerUniversity,Beijing 102206,China)
Abstract:Thedeterminationofthepermeabilitytensoroffracturedrockmasseshasbeenthefocusofresearchin
thefieldofseepage.Inthispaper,basedonthegeneralizedDarcy’slaw,anewspatialone - dimensionalringunit
modelisproposedtocalculatethepermeabilitytensorofthree - dimensionalfracturedrockmasses ,whichsimplifies
thepreviouscomplexthree - dimensionalsurfaceflowmodel.Therationalityoftheone - dimensionalringunitmodel
isverifiedbyanalyticalandnumericalsimulationmethods,andtheaccuracyofthemodelischeckedbyusingthe
surfaceunitmodel.Theresultsshowthat :forthesamefracturedrockmasses,thepermeabilitytensorcalculated
bytheringunitmodeliswithinareasonableerrorrangecomparedwiththedataverifiedbythefieldpiezometric
test ,andisbasicallythesameasthatcalculatedbythesurfaceunitmodel;theringunitmodelisafeasible,ac
curateandpracticalsimplifiedmodel,whichissimplerthanthesurfaceflowmodelandcangreatlyreducetheop
erationscaleandoptimizethealgorithmwhencalculatingthepermeabilitytensor.Thisresearchcanprovidenewi
deasfordeterminingthepermeabilitytensoroffracturedrockmasses.
Keywords:discretefracturenetwork;ringunit;permeabilitytensor;surfaceunit;constantheadmethod
(责任编辑:李 娜)
(上接第 574页)
Theoreticalanalysisandtestofsedimentcarryingcapacityformula
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HOULin,ZHANGHongwu,ZHAOJunchi,LILinqi
(1.StateKeyLaboratoryofHydroscienceandEngineering,TsingHuaUniversity,Beijing 100084,China;
2.InstituteofArchitectureDesignandResearch,ChineseAcademyofSciencesCo.,Ltd,Beijing 100086,China)
Abstract:Inordertoimprovethedisciplinelevelofriverdynamicsandprovidetheoreticalbasisforacademicre
searchandengineeringapplicationtoselecttheformulaofsedimentcarryingcapacityofwaterflow.Thispaper
systematicallyreviews the research progress ofclassicalsedimentcarrying capacity formulas in China,
meanwhile,explainsandanalyzestheprinciples,derivationprocess,technicaldetailsprocessing,datacalibra
tionandotherlinksofeachformula ,whichpointsoutthehighlightsandshortcomingsofeachformulaandcorrects
thedefinitionofsedimentcarryingcapacityofflow.BasedonthetestofthemeasureddataoftheYellowRiverand
theYangtzeRiver ,theapplicabilityoftheformulaisevaluatedbythegraphicalverificationmethodandstatistical
indicators.Itisfoundthatalthoughthedatacalibrationlinkcanimprovetheoverallcalculationaccuracyofthe
formula,theformulawiththeoreticalerrorscannotreflecttheautomaticriverbedadjustmentfunctionoftheactual
river.FurthertheoreticalanalysisshowsthatthereasonwhyZhangHongwu’ssedimentcarryingcapacityformula
isinthebestagreementwiththemeasureddataisthatthesedimenttransportefficiencycoefficientandtheflowre
sistancecoefficientarereasonablytreatedasacomprehensivecoefficient ,whichavoidsthetheoreticalerrorthat
theflowsedimentcarryingcapacityisproportionaltotheflowresistanceinmanyformulas ,andexpressesthein
m
fluenceofdifferentsedimentconcentrationsontheflowsedimentcarryingcapacitythroughtheterm c(a + bS v ) ,
whichcanensurethattheformulahashighcalculationaccuracyunderlargewaterandsedimentconditions.
Keywords:sedimentcarryingcapacityofflow; formulatest; theoreticalanalysis; sedimentconcentration;
YellowRiver;flowresistance
(责任编辑:李福田)
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