Page 106 - 2024年第55卷第5期
P. 106

Studyonsoilgradationcharacteristicsandcontinuousgradingequation

                  FANShukang,YANGZhengquan,ZHUKaibin,ZHAOYiying,LIUXiaosheng,ZHAOJianming
                                  (StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,
                                 ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China)

                  Abstract:The Grading ofsoilhas a significantimpacton its engineering mechanicalproperties.The
                  comprehensiveinvestigationofsoilgradingcharacteristicsandtheestablishmentofquantitativegradingequationsare
                  essentialforanalyzingthephysicalandmechanicalpropertiesofsoilaswellasitsengineeringapplications.Byana
                  lyzingthegradationcharacteristicsofsoilundervariousparticlecontentdistributionpatterns ,thefundamentalform
                  ofthegradationcurveofcontinuouslygradedsoilwasdetermined.BasedontheBurrdistribution ,acontinuous
                  gradingequationsuitableforvarioustypesofcontinuouslygradedsoilwasproposed.Therelationshipbetweenthe
                  characteristicparametersofthegradingequationandtheshapeofthegradingcurvewasquantitativelyanalyzed ,
                  andthewideapplicabilityofthecontinuousgradingequationwasverifiedusingactualengineeringdata.There
                  searchfindingsindicateastrongcorrelationbetweenthedistributionpattemsofsoilparticlecompositioncontentand
                  theshapeofgradationcurve,andtherearefourbasicshapesforcontinuousgradationcurve,includingapproxi
                  matelystraight ,bisquar,convexandinverseS - shape.Theproposedcontinuousgradingequationcanaccurately
                  describethesefourbasicforms.Theshapeofthegradingcurveandthequalitysoilgradingcanbequantitativelyde
                  terminedbyanalyzingthecharacteristicparametersofthecontinuousgradingequation.Thecontinuousgradinge
                  quationcanwelldescribethegradingcharacteristicsofcoarse - grainedsoil ,suchasnaturalgravelandartificial
                  blastingrockfill,aswellasfine - grainedsoillikenaturalsand,silt,andclayinthecoveringlayer.
                  Keywords:continuousgradedsoil;gradingcurve;continuousgradingequation;applicabilityverification


                                                                                    (责任编辑:李 娜)
              (上接第 596页)
                                 Mechanism ofmoisturetransportassociatedwithsummer
                                         precipitationoftheHanjiangRiverBasin

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                 CHENJingyuan,ZHANGShuyu,ZHANGGengxi,ZHAOYong,ZHAOXining,GAOXuerui
                       (1.CollegeofWaterResourcesandArchitecturalEngineering,NorthwestA&FUniversity,Yangling 712100,China;
                   2.SchoolofEnvironmentalScienceandEngineering,SouthernUniversityofScienceandTechnology,Shenzhen 518055,China;
                            3.CollegeofHydraulicScienceandEngineering,YangzhouUniversity,Yangzhou 225009,China;
                            4.StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteof
                                      WaterResourcesandHydropowerResearch ,Beijing 100038,China;
                             5.InstituteofSoilandWaterConservation,NorthwestA&FUniversity,Yangling 712100,China)
                  Abstract:Inordertocopewiththeincreasinglyfrequentandintensedroughtsunderclimatechange,andto
                  guaranteethewatersafetyofwatertransferprojectsandlocalwateruse,itisurgenttorevealthemechanismsof
                  thechangesinprecipitationoftheHanjiangRiverBasin (HRB),whichisanationalstrategicwatersource.Sum
                  merprecipitationintheHRBaccountsfor40 - 50% oftheannualprecipitation.Inthisstudy ,theHybridSingle -
                  ParticleLagrangianIntegratedTrajectorymodelwasusedtoanalyzethemoisturetransportofsummerprecipitation
                  intheHRBanditsatmosphericcirculationbackgroundduring1959 - 2022.Itwasfoundthatprecipitationlasting
                  over72hoursaccountedfor44.6% ofthetotalsummerrainfall,andbothfrequencyandamounthaveshownsig
                  nificantdownwardtrends ,whichisthemainreasonforthedecreaseinprecipitationoftheHRB.Simulationofthe
                  moisturetransportprocessshowsthattheSouthChinaSea (SCS),WesternPacific(WP),andEasternChina(EC)
                  arethemainsourcesofwatervaporforsummerprecipitationinthebasin,withcontributionsof34.7%,28.7%,and
                  27.2%,respectively.Comparisonofmoisturetransportprocessesforprecipitationofdifferentdurationsshowsthat
                  thelongertheprecipitationduration ,thehigherthecontributionofwatervaporfromSCSandWP.Althoughthe
                  moisturefromWPshowsasignificantincrease ,themoisturefromSCSdecreasessignificantlysotheprecipitation
                  over72hoursstillshowsadecreasingtrend.ThenegativecorrelationbetweentheWestPacificSubtropicalHigh
                  indexandthecontributionofSCStotheprecipitationinHRBpartiallyconfirmsthecontributionoftheenhance
                  mentandexpansionoftheWPSHonthereductionofsummerprecipitationofHRBinrecentyears.
                  Keywords:HanjiangRiverBasin;precipitationvariability;HYSPLIT;moisturetransport;large - scaleclimatepattern

                                                                                    (责任编辑:耿庆斋)

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