P波SV波随机组合斜入射下沥青混凝土面板堆石坝动力响应研究

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关键词：沥青混凝土面板堆石坝；随机组合斜入射；设计地震动；峰值加速度；永久变形 中图分类号：TV641.4 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202310028

Dynamic response of asphalt concrete face rockfill dam under random combination ofP wave and SV wave oblique incidence

GAO Chuan， SONG Zhiqiang，WANG Zongkai， LI Chuang （State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China， Xi'anUniversityofTechnology，Xi'an7lOo48，China）

Abstract：Theuncertaintyofthecombined incidenceangleofseismic waves often hasasignificanteffectonthedynamicresponse offacedrockfilDAMS.Inthispaperthemotionfieldofsurfacecontrolpointsisdecomposedbytheprincipleofwavefieldsuper position，andthetimehistoryofincidentPandSVwaves isobtainedbytwo-dimensionalinversion.TheangleofincidentPwave andSVwaveinthewaveinputmodelarerandomlyselectedbythemethodofnumbertheory.Theinfluenceoftheuncertantyof combinedincidentangleontheseismicresponseofasphaltconcretefacedrockfilldamisstudiedbythedynamiccalulatioofdifer entcombined incidentangles.Takingapracticalprojectasanexample，byanalyzing the meanvalue，coeficientofvariation， 95% （204号 confidenceintervalimitandextremevaluediferenceoftheorzontalpeakaccelerationoffoundationsurface，panelstressandac celeration，dambodyhorzontalpeakaccelerationandpermanentdeformation，andotherstatisticallawsanddistributiontypetests， andcomparedwiththevertical incidenceofseismic waves，TheinfluenceofrandomcombinationincidenceAngleand input ground motionintensityonrandomresponsedispersiondegreeandobedienceprobabilitydistrbutionisanalyzed.Theresultsshowthat consideringtheuncertaintyof thecombined incidenceangle，the seismicresponse dispersionof thefoundation surfaceof thedam will increase.The maximum principal tensile stress of the panel increases by at least 40% compared with the calculated result of verticalicidence.Theinfluenceofte horizontalpeakacelerationonthedamcrestandthepanelcrestis greater than thatonthe permanentdeformation.Comparedwiththeresultsofverticalincidence，，thepermanentdeformationofthethree groupsofseismic waves has a transcendental probability of more than 70% . The statistical results of seismic response of dam body may not accord with normal distribution.The dispersion ofseismic response results ofoverlay layer is greater than thatofdam body.

Keywords：asphaltconcretefacerockfilldam;randomcombinationobliqueincidence;design ground motion;peakacceleration： permanent deformation

中国西部地区水能资源分布广泛，该地区地震烈度相对较高，使得水利水电工程的抗震安全面临着很大的挑战[1]。（剩余16342字）