IndustrialConstructionVol.53,No.2,2023工业建筑2023年第53卷第2期169黄土斜坡场地动力特性的现场测试和数值模拟*张荣1王彬2(1.武汉铁路职业技术学院,武汉430205;2.中铁第四勘察设计院集团有限公司,武汉430063)摘要:为研究黄土斜坡场地的动力特性,对宝兰高铁秦安—天水南段某路基段斜坡场地进行现场振动测试,并利用有限元软件分别建立了在地震激励、列车激励以及地震、列车耦合激励作用下黄土斜坡场地模型。运用二维等价线性时程响应动力分析法对不同振源下黄土斜坡场地的动力响应进行计算,分析不同激励作用下黄土斜坡的场地效应以及土体参数对振动传播的影响。研究发现:列车激振波主要集中在10~80Hz频段,坡面和坡顶对振动有明显的放大作用。另外,地震波与列车运行激振波在时域和频域均存在很明显的差异,列车激励引起的黄土斜坡场地的振动振波分布比较集中,单峰值有规律的出现,而地震波波形分布离散,地震波主要集中在0.1~25Hz频段。同时黄土斜坡场地出现振动放大的位置不仅受到振动激励的影响,还与土体弹性模量密切相关。关键词:现场测试;振动激励;黄土斜坡;场地效应;动力响应DOI:10.13204/j.gyjzG21122715FieldTestsandNumericalSimulationsonDynamicCharacteristicsofLoessSlopesZHANGRong1WANGBin2(1.WuhanRailwayVocationalCollegeofTechnology,Wuhan430205,China;2.ChinaRailwaySiyuanSurveyandDesignGroupCo.,Ltd.,Wuhan430063,China)Abstract:Inordertostudy-dynamiccharacteristicsofloessslopes,fieldvibrationtestsonasubgradeslopeintheQin’an-TianshuisouthsectionofBaoji-LanzhouHigh-SpeedRailwaywereconducted,andamodelofloessslopesexcitedbyseismicwaves,vibrationwavesproducedbytrainoperationandthewavecoupledwiththebothwaveswereconstructedbythefiniteelementsoftware.Thedynamicresponsesofloessslopesbydifferentvibrationexcitationoftheabovewerecalculatedbythedynamicanalysismethodoftwo-dimensionalequivalentlineartime-historyresponses,andtheinfluenceofsoilparametersonthevibrationpropagationwasanalyzed.Itwasfoundthatthevibrationfrequenciesofwavesproducedbytrainoperationweremainlyintherangeof10to80Hz,andtheslopesurfaceandslopecresthadanobviousamplificationeffectonvibration.Inaddition,thereweregreatdifferencesbetweenseismicwavesandope...