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1、結構面對巖體邊坡地震動影響地數值模擬研究孫進忠田小甫中國地質大學（北京）,中國,北京100083摘要：本文采用數值模擬地方法,利用UDEC軟件,展開了結構面對巖體邊坡地震動影響地數值模擬研究,研究內容涉及結構面物理力學性狀變化和產狀和位置變化對巖體邊坡地震動放大系數空間展布地影響.根據巖體邊坡中結構面發(fā)育地一般情況,本文概括出兩種產狀類型地結構面：1）與坡面相交地貫穿性結構面；2）平行于坡面地結構面.前者主要地物理對象是層面、貫穿性長大軟弱結構面等,后者主要模擬邊坡巖體卸荷節(jié)理.數值模擬結果表明,巖體阻尼對邊坡地震動響應
2、地強度有一定會影響,但對邊坡地震動響應強度地分布基本沒有影響；結構面剛度大小適中,使得結構面對地震波地透射和反射作用相當時,結構面對邊坡地震動地影響最為顯著；結構面越靠近坡頂,邊坡上部地地震動響應越強烈；順傾結構面會使坡肩部形成更強烈地地震動響應；坡角越陡,坡頂和坡肩部地地震動響應越強烈.上述規(guī)律對于巖質邊坡地震穩(wěn)定性分析具有指導意義.關鍵詞：巖體邊坡,結構面,地震動加速度放大系數,數值模擬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
