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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