Page 45 - 2023年第54卷第8期
P. 45

Studyonpredictingthecompacteddensityofrockfillmaterialsbased
                                            onthegranularpackingalgorithm

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                    SHENChaomin ,DENGGang,LIUSihong,YANJun,MAOHangyu,WANGLiujiang                    1
                         (1.CollegeofWaterConservancyandHydropowerEngineering,HohaiUniversity,Nanjing 210098,China;
                              2.KeyLaboratoryofConstructionandSafetyofWaterEngineeringofMinistryofWaterResources,
                                 ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100048,China)
                  Abstract:Thecompacteddensityofrockfillmaterialsisanimportantindextoreflecttheirengineeringandme
                  chanicalproperties.Anumericalgranularpackingalgorithm ,whichisbasedonthedimension - reductionmapping
                  andcontainsonlyoneparameter ,isproposedtodeterminethemaximum densityofrockfillmaterialsinrealtime
                  whentheparticlesizedistributionsisgiven.Comparedwiththeexperimentalresultsintheliterature ,theproposed
                  algorithmcanpredictthemaximumdensityofbothwell - gradedandgap - gradedrockfillmaterials,whichprovides
                  anewideafortheeffectiveoptimizationofthegradingcurveofrockfillmaterials.Theeffectsoffinestruncationand
                  downscalingonthecompacteddensityareanalyzedusingtheproposedalgorithmanditisfoundthat :theproposed
                  methodcanwellpredictthecompacteddensityoftheprototyperockfillmaterialsbasedontheresultofthedown
                  scaledsample.Theperformanceofthepredictionofthescaleeffectisinfluencebythefinestruncation,andtheer
                  rorofthepredictedcompacteddensifyisproportionaltothefinescontent ;Fromthepointofviewofgranularpack
                  ing ,theskeletonvoidsofcoarsecontentdecreasesforthedownscaledspecimens,disfavoringthefillingoffines,
                  whiletheincreasingfinescontentwiththedownscalingprocedurehasnoconsistenteffectonthecompacteddensity
                  ofrockfillmaterials,anddependsonboththeparticlesizedistributionsofboththecoarseandfineparticles.
                  Keywords:rockfillmaterials;granularpacking;maximumdensity;scaleeffect;particlesizedistribution


                                                                                    (责任编辑:李 娜)

              (上接第 919页)
                             Studyonwave - dampingcharacteristicsofrigidplantsintidalflats

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                              ZHANGZhilin  1,2,3 ,HUANGBensheng 1,2,3 ,LIUDa  ,QIUJing
                            (1.GuangdongResearchInstituteofWaterResourcesandHydropower,Guangzhou 510635,China;
                        2.StateandLocalJointEngineeringLaboratoryofEstuarineHydraulicTechnology,Guangzhou 510635,China;
                          3.SouthernMarineScienceandEngineeringGuangdongLaboratory(Zhuhai),Zhuhai 519082,China)


                  Abstract:Theplantsintidalflatsarebeneficialtowatersecurityincoastalareas,andquantifyingthewaveat
                  tenuationeffectofmatureplantsisthebasisforimprovingtheresilienceofthecoasts.Basedongeneralrulesand
                  twowaveattenuationmodels ,thispaperhasputforwardanewmethodforcalculatingthewaveattenuationcoeffi
                  cientofplantsintidalflats,whichcanbeusedtocalculatethewaveheightbehindplants.Then,theseexpres
                  sionshavebeenvalidatedbyalargeamountofexperimentaldata.Finally ,theresultsofwaveheightbehind
                  plantscalculatedbythismethodhavebeencomparedtothestandardmethod.Theresultsshowthatthedamping
                  factorandwaveattenuationcoefficientcandirectlyreflectthewaveattenuationcharacteristicsandtheproportionof
                  plantareatocross - sectionalareainthedirectionofwavepropagationisthekeydimensionlessparameterthataf
                  fectsthemechanismofwaveattenuationbyrigidplants.Whenplantsemerge ,thecalculatedvalueofthewave
                  heightbehindplantsbythismethodisclosetothestandardmethod;whilewhenplantsaresubmerged,this
                  methodcandescribethewaveattenuationmoreaccurately.Comparedtothestandardmethod,thismethodcon
                  siderstheinfluenceofplantsubmergence ,andintuitivelyrevealstheinfluenceofthedensity,width,heightof
                  thecanopy ,averagediameterofplants,waterdepth,andotherparameters,makingitsuitableformorecondi
                  tions.Amodelbasedonthismethodcanbeusedtoestimatetheimpactofrelevantparametersonthewaveattenu
                  ationbyplants ,whichcanprovideasignificantbasisfortheplanninganddesignofrigidplantsintidalflatsand
                  relatedmathematicalmodelresearch.
                  Keywords:waveattenuationbyplant;waveattenuationmodels;waveattenuationcoefficient;dragcoefficient;
                  physicalmodeltests

                                                                                    (责任编辑:李福田)

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