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1、结构面对岩体边坡地震动影响地数值模拟研究孙进忠田小甫中国地质大学（北京）,中国,北京100083摘要：本文采用数值模拟地方法,利用UDEC软件,展开了结构面对岩体边坡地震动影响地数值模拟研究,研究内容涉及结构面物理力学性状变化和产状和位置变化对岩体边坡地震动放大系数空间展布地影响.根据岩体边坡中结构面发育地一般情况,本文概括出两种产状类型地结构面：1）与坡面相交地贯穿性结构面；2）平行于坡面地结构面.前者主要地物理对象是层面、贯穿性长大软弱结构面等,后者主要模拟边坡岩体卸荷节理.数值模拟结果表明,岩体阻尼对边坡地震动响应
2、地强度有一定会影响,但对边坡地震动响应强度地分布基本没有影响；结构面刚度大小适中,使得结构面对地震波地透射和反射作用相当时,结构面对边坡地震动地影响最为显著；结构面越靠近坡顶,边坡上部地地震动响应越强烈；顺倾结构面会使坡肩部形成更强烈地地震动响应；坡角越陡,坡顶和坡肩部地地震动响应越强烈.上述规律对于岩质边坡地震稳定性分析具有指导意义.关键词：岩体边坡,结构面,地震动加速度放大系数,数值模拟NumericalAnalysisoftheInfluenceofStructurePlanesontheEarthquakeMot
3、ioninRockSlopesSUNJin-zhongTIANXiao-fuChinaUniversityofGeosciences(Beijing),Beijing100083,ChinaAbstract:ThenumericalsimulationwithsoftwareUDECfortheinfluenceofstructureplanesontheearthquakemotionofrockslopesarecarriedoutinthispaper.Thestudydealswiththeinfluenceof
4、thevariationsinthephysicalandmechanicalparametersandattitudesaswellaspositionsofstructureplanesontheintensificationofearthquakemotioninrockslopes.Accordingtogeneralsituationsofstructureplanesdevelopinginrockslopes,twoattitudetypesofstructureplanesaregeneralizedin
5、thispaper:1)penetratingstructureplanesintersectingwiththeslopesurface;2)structureplanesparalleltotheslopesurface.Thefirsttypeofstructureplanesisrelativetostratalayersandlongpenetratingweakstructureplanes,andthesecondtypemainlystandsforunloadedjointsoftherockslope
6、s.Itisrevealedbynumericalanalysesthatthevariationinthedampratioofrockmasscanaffecttheintensificationofearthquakemotionintheslopetosomeextent,butithaslittleinfluenceonthedistributionoftheearthquakemotionintheslope;astructureplanewillhavesignificantinfluenceontheea
7、rthquakeresponseoftheslopeonlyifthestiffnessofthestructureplaneisatapropervalue;theshorterthedistancebetweenastructureplaneandthetopsurfaceoftheslope,thestrongertheearthquakeresponseoftheslope;thestructureplaneacrossanddiptotheslopesurfacewillcausestrangerearthqu
8、akemotionintheupperslopebodythanthatcausedbystructureplaneshorizontaloranti-diptotheslopesurface;thesteppertheangleoftheslopesurface,thestrongertheearthquakemo
