Page 75 - 2024年第55卷第1期
P. 75

Analysisoftheinfluenceofvegetationontheriverbankstabilityinthe
                                      LowerJingjiangReachunderwaterlevelchange

                                              QIUJiaqi,YUMinghui,LIQian
                       (StateKeyLaboratoryofWaterResourcesEngineeringandManagement,WuhanUniversity,Wuhan 430072,China)

                  Abstract:Toanalyzethetypicaltopclay - bottomsandbankslopeoftheLowerJingjiangReach(LJR),theveti
                  vergrass - tallfescuewasselectedastheprotectiontype,regardingtherootanchorageeffectandtranspirationofthe
                  vegetation.UsingGeoStudiotoimitatethestrengthandthermodynamicindicatorsofthebank ,studyingtheinflu
                  enceofthemagnitudeofwaterleveldecline ,rateofwaterleveldeclineandinitialwaterlevelonbankstabilityby
                  singlefactoranalysisapproach,andcomparingthedegreeofinfluenceofthethreefactorsbygreyrelationalanaly
                  sis.Theresultsshowthat :asthewaterleveldecline,thesafetyfactorofbankslopefirstdecreasesrapidlyand
                  thentendstostablevalues ;bankstabilityismostinfluencedbytherapidrateofwaterleveldecline,whentherate
                  ofwaterleveldeclineislessthan1m?d,thebaresoilsloperemainsinabasicstablestate;whenitisgreaterthan
                  3m?d,theslopebecomesinstability.Vegetationcanimprovethebankstability,comparingthevegetatedslopeto
                  thebareslope,itssafetyfactorcanbeincreasedby4.33% atmost;thecorrelationbetweenthesafetyfactorof
                  bankslopeandthethreefactorsdecreasesundervegetatedcondition,withadecreaseof3.73% atmost.There
                  sultsclarifiedtheeffectofthevegetationonthebankstabilityoftheLJRunderwaterlevelchangeandprovidearef
                  erenceforecologicalbankprotectionprojects.
                  Keywords:ecologicalrevetment;LowerJingjiangReach;bankstability;waterleveldecline


                                                                                    (责任编辑:耿庆斋)


              (上接第 59页)
                        FailurelawofPCCPcausedbybrokenwires Ⅱ:Numericalsimulationstudy

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                  DOUTiesheng,DONGXiaonong,NIUWenlong,LIYanlong,NINGJinghua,LIKangping
                     (1.StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteofWaterResourcesand
                                             HydropowerResearch ,Beijing 100038,China;
                    2.StateKeyLaboratoryofEco - hydraulicsinNorthwestAridRegion,Xi’anUniversityofTechnology,Xi’an 710048,China;
                               3.PowerchinaShandongPipelineEngineeringCorporationLimited,Jinan 250117,China)
                  Abstract:Numericalsimulationofwirebreakageinprestressedconcretecylinderpipes(PCCP)currentlyeither
                  removestheentirecirclecontainingthebrokenwireorassumesafixedrangeineachbrokenwireregainingitsfull
                  tension ,withoutconsideringwhetherthisrangeduetomortardamagecanbeextended.Thispaperabstractlyana
                  lyzestheinteractionmechanismsbetweenthemortar ,steelwires,andcoreconcreteofPCCP,introducesthe
                  springelement ,cohesivecontactmodel,andconcreteplasticdamagemodel,proposesafull - processsimulation
                  methodforprestressingthecoreconcrete ,cuttingsteelwiresatarbitraryposition,andforminganextendable
                  rangeineachbrokenwireregainingitsfulltension,andclarifiesthekeyparametersforregulatingtheinitialsize,
                  extensiontiming,andextensionamplitudeofthisrange.Basedonprototypetests,numericalmodelswereestab
                  lishedforclusteredandscatteredwirebreakageunderconstantinternalpressure ,andtherationalityofthenew
                  simulationmethodwasverifiedfrom theperspectiveoftheentireprocessfrom internalpressureloadingtowire
                  breakagefailure.Andtheserevealthelawsoftheprestresslossandfailureofthecore ,makeitpossibletosimu
                  latevariousthree - dimensionalbreakpointdistributionsinpracticalengineering ,andprovideanewmeansfor
                  moreaccuratepredictionandevaluationofthestructuralperformanceofthewire - brokenPCCP.
                  Keywords:PCCP;clusteredwirebreakage;scatteredwirebreakage;numericalsimulationmethod;prestress
                  loss;failure


                                                                                    (责任编辑:韩 昆)


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