Page 66 - 2024年第55卷第11期
P. 66

SimulationofChayuMw8.6groundmotionbasedonkinematicsource

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                                  ZHONGJufang,HUYishi,ZHANGYanhong,HUXiao
                        (1.SchoolofCivilEngineeringandTranspotation,NanchangHangkongUniversity,Nanchang 330063,China;
                                2.ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100048,China)
                  Abstract:Inordertoobtainthespatialdistributionofthegroundmotionofthe1950ChayuMw8.6earthquake,
                  andtoexploretheinfluenceofthesourcemodelonthesimulatedgroundmotionandtheinfluenceoftheearthquake
                  onthelowerreachesoftheYarlungZangboRiver ,thesingle - faultanddouble - faultkinematichybridsourcemod
                  elswereestablishedonthebasisofpreviousstudies.ConsideringthelithosphericvelocitystructuremodelUST
                  Clitho1.0andtheglobalcrustalmodelCrust1.0 ,theundergroundone - dimensionalvelocitystructurescorresponding
                  tothesingle - faultmodelsiteandthedouble - faultmodelsitewereconstructedrespectively.Thespectralelement
                  methodwasusedtostudythegroundmotionsynthesisinthetargetareaofthe1950ChayuMw8.6earthquake.By
                  comparingthesimilaritiesanddifferencesbetweenthesimulatedaccelerationtimehistoryandresponsespectrumof
                  thefourobservationpointsinthetargetareaandthepreviousresearchresults ,theapplicabilityofthemodelcon
                  structedinthispaperisverified.Theanalysisresultsofgroundmotioncharacteristicsinthestudyareashowthat :
                  ( 1)thesurfacegroundmotionintensityislarge.Intheprojectionareaofthefaultzone,themaximum PGA,
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                  PGV,andPGDofthesingleanddoublefaultmodelsare1050cm?sand1145cm?s,472cm?sand291cm?s,
                  and107cmand652cm,respectively.(2)Thesourcemodelhasagreatinfluenceonthesimulatedgroundmo
                  tion.ThemaximumdifferenceofPGA,PGVandPGDinthesurfaceprojectionareaofthesingleanddoublefault
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                  modelis95cm?s,181cm?sand545cm,respectively.(3)Theattenuationfittingeffectofsingle - faultmodel
                  groundmotionwithfaultdistanceisbetterthanthatofdouble - faultmodelgroundmotion.ExceptthatthePGDval
                  ueofEW componentofdouble - faultmodeldecaysslowerwiththeincreaseoffaultdistancethantheothertwocom
                  ponents ,thePGDofPGA,PGVandothercomponentsofsingle - faultmodelanddouble - faultmodeldecaysatthe
                  samespeedwiththeincreaseoffaultdistance.Theattenuationrateofgroundmotioninthehangingwallwiththe
                  increaseoffaultdistanceisfasterthanthatinthefootwall.(4)TheChayuMw8.6earthquakeproducedstrong
                  groundmotionandobviouspermanentsurfacedisplacementateachengineeringsite.Ifthehistoricalearthquakeis
                  repeated,theadverseeffectsoftheearthquakewillinevitablyoccurateachengineeringsite,andattentionshould
                  bepaidtopreventingtheoccurrenceofseriousearthquakedisasters.
                  Keywords:Chayuearthquake;spectralelementmethod;singleanddoublefaultsource;simulatedgroundmo
                  tion ;near - faulteffect;attenuationeffect

                                                                                    (责任编辑:韩 昆)


              (上接第 1318页)
                             Physicalmodelingofcompoundfloodingsimulationincoastalcities

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                                 XUKui ,ZHUANGYunchao ,MAChao ,LIANJijian             1,2
                 (1.StateKeyLaboratoryofHydraulicEngineeringIntelligentConstructionandOperation,TianjinUniversity,Tianjin 300350,China;
                                    2.SchoolofCivilEngineering,TianjinUniversity,Tianjin 300350,China)
                  Abstract:Themechanismofcoastalurbanfloodingiscomplexduetotheimpactofmultipleflooddriverssuchas
                  heavyrainfall,coastalhightidelevelandriverflooding.Therefore,itisofgreatsignificancetoeffectivelyreveal
                  theoccurrenceprocessandmechanismofcoastalurbancompoundfloodingforthescientificdevelopmentofflood
                  controlstrategies.Thisstudyinvestigatesthemethodofconstructingaphysicalmodelforsimulatingcompound
                  floodingincoastalcities.Thecompoundfloodsimulationphysicalmodelandnumericalmodelwereconstructed
                  withthetypicalurbanareaofMeisheRiveroutletinHaikouCityasanexample.Basedonthephysicalandnu
                  mericalmodels ,anexperimentalstudyofphysicalmodelforsimulatingcompoundflooddrivenbythreefactorsof
                  heavyrainfall - hightidelevel - riverfloodingwascarriedout ,andtheaccuracyofthemodelwasevaluated.The
                  resultsshowthatthephysicalmodelconstructedinthisstudycanaccuratelysimulatethecompoundflood ,andthe
                  Nashefficiencycoefficientvaluesofbothmodelcalibrationandvalidationaregreaterthan0.9 ,andtherelative
                  errorvaluesarealllessthan10%,sothemodelhashighaccuracy.
                  Keywords:coastalurban;physicalmodel;compoundflooding;numericalsimulationmodel

                                                                                    (责任编辑:耿庆斋)

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