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1、結(jié)構(gòu)面對巖體邊坡地震動影響的數(shù)值模擬研究孫進忠田小甫中國地質(zhì)大學(北京),中國,北京100083摘要:本文采用數(shù)值模擬的方法,利用UDEC軟件,展開了結(jié)構(gòu)面對巖體邊坡地震動影響的數(shù)值模擬研究,研究內(nèi)容涉及結(jié)構(gòu)面物理力學性狀變化和產(chǎn)狀和位置變化對巖體邊坡地震動放大系數(shù)空間展布的影響。根據(jù)巖體邊坡中結(jié)構(gòu)面發(fā)育的一般情況,本文概括出兩種產(chǎn)狀類型的結(jié)構(gòu)面:1)與坡面相交的貫穿性結(jié)構(gòu)面;2)平行于坡面的結(jié)構(gòu)面。前者主要的物理對象是層面、貫穿性長大軟弱結(jié)構(gòu)面等,后者主要模擬邊坡巖體卸荷節(jié)理。數(shù)值模擬結(jié)果表明,巖體阻尼對邊坡地震動響應的強度有一定會影響,但對邊坡地震動響應強度的分布基本沒有影響;結(jié)構(gòu)面剛
2、度大小適中,使得結(jié)構(gòu)面對地震波的透射和反射作用相當時,結(jié)構(gòu)面對邊坡地震動的影響最為顯著;結(jié)構(gòu)面越靠近坡頂,邊坡上部的地震動響應越強烈;順傾結(jié)構(gòu)面會使坡肩部形成更強烈的地震動響應;坡角越陡,坡頂和坡肩部的地震動響應越強烈。上述規(guī)律對于巖質(zhì)邊坡地震穩(wěn)定性分析具有指導意義。關(guān)鍵詞:巖體邊坡,結(jié)構(gòu)面,地震動加速度放大系數(shù),數(shù)值模擬NumericalAnalysisoftheInfluenceofStructurePlanesontheEarthquakeMotioninRockSlopesSUNJin-zhongTIANXiao-fuChinaUniversityofGeosciences(Bei
3、jing),Beijing100083,ChinaAbstract:ThenumericalsimulationwithsoftwareUDECfortheinfluenceofstructureplanesontheearthquakemotionofrockslopesarecarriedoutinthispaper.Thestudydealswiththeinfluenceofthevariationsinthephysicalandmechanicalparametersandattitudesaswellaspositionsofstructureplanesontheinten
4、sificationofearthquakemotioninrockslopes.Accordingtogeneralsituationsofstructureplanesdevelopinginrockslopes,twoattitudetypesofstructureplanesaregeneralizedinthispaper:1)penetratingstructureplanesintersectingwiththeslopesurface;2)structureplanesparalleltotheslopesurface.Thefirsttypeofstructureplan
5、esisrelativetostratalayersandlongpenetratingweakstructureplanes,andthesecondtypemainlystandsforunloadedjointsoftherockslopes.Itisrevealedbynumericalanalysesthatthevariationinthedampratioofrockmasscanaffecttheintensificationofearthquakemotionintheslopetosomeextent,butithaslittleinfluenceonthedistri
6、butionoftheearthquakemotionintheslope;astructureplanewillhavesignificantinfluenceontheearthquakeresponseoftheslopeonlyifthestiffnessofthestructureplaneisatapropervalue;theshorterthedistancebetweenastructureplaneandthetopsurfaceoftheslope,thestrongertheearthquakeresponseoftheslope;thestructureplane
7、acrossanddiptotheslopesurfacewillcausestrangerearthquakemotionintheupperslopebodythanthatcausedbystructureplaneshorizontaloranti-diptotheslopesurface;thesteppertheangleoftheslopesurface,thestrongertheearthquakemo