Page 178 - 《水资源与水工程学报》2024年第2期
P. 178

!35 "!2 #                         & ' ( ) & * + , -                               Vol.35No.2
               2024 $ 4 %               JournalofWaterResources&WaterEngineering                 Apr.,2024

            DOI:10.11705/j.issn.1672-643X.2024.02.20


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                 GHIJK:TV312;TV64   LMNOP:A    LQRK:1672643X(2024)02017409

                     Seismicresponseofgravitydamssubjectedtoobliqueincidenceof
                                  nearfaultmainshock-aftershocksequences

                                              1
                                                          1
                                                                      1
                                     LIYuchen,LIXiaona,YANGJie,ZHUHemin             2
            (1.StateKeyLaboratoryofEcohydraulicsinNorthwestAridRegionofChina,Xi’anUniversityofTechnology,Xi’an710048,China;
                 2.NingxiaWaterResourcesandHydropowerSurveyDesignandResearchInstituteCo.,Ltd.,Yinchuan750000,China)
                 Abstract:Alargeearthquakeusuallyconsistsofmainshockandaftershock.Whentheepicenterofthe
                 earthquakeisclosetothegroundsurface ,theobliqueincidenceofmainshockandaftershockoftenoccur
                 nearthefaultarea.Therefore ,itisnecessarytoconsiderthecaseofobliqueincidenceofseismicwaves
                 atmultipleanglesinsteadofverticalincidenceonly.Threemainshock-aftershocksequencesmeasured
                 nearthefaultareawereselectedtoderivetheequivalentnodeforceformulaofgroundmotionPwaveob
                 liqueincidenceinterface ,andthenthefeasibilityoftheformulawasverified.TakingKoynaDamasthe
                 researchobject ,theseismicresponseofthedamattheincidenceangleof0°-90°wasstudiedundertwo
                 workingconditions,namely,singlemainshocksequence,mainshock-aftershocksequence.Threeindi
                 cesofdisplacement,damageindexanddamagedissipationenergywereusedtoanalyzethedamageofthe
                 dambodyaftertheearthquake,andthelocaldamageindexwasestablishedtoquantifythedamagetothe
                 dam.Theresultsshowthatwhentheincidenceanglevariesintherangeof15°-75° ,theseismicre
                 sponseofthedamisgreaterthanthatoftheverticalincidenceunderthetwoworkingconditions.Under
                 allthreeperformanceindices ,theseismicresponseofthemainshockandaftershocksequenceisgreater
                 thanthatofthesinglemainshock.
                 Keywords:seismicresponseofgravitydam;nearfaultgroundshock;Pwave;mainshock-aftershock
                 sequence ;obliqueincidence




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