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《基于静动力有限元的边坡抗震稳定分析方法》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第31卷第7期岩土力学V01.31No.72010年7月RockandSoilMechanicsJul.2010文章编号l1000--7598(2010)07—2303一06基于静动力有限元的边坡抗震稳定分析方法周桂云1,2,李同春3(1.金陵科技学院建筑工程学院,南京211169:2.中国人民解放军N-l-大学工程兵工程学院,南京210007;3.河海大学水利水电工程学院,南京210098)摘要:由人工截断边界输入地震波,通过时程积分法确定地震荷载作用下边坡的应力和变形,在人工截断边界上采用黏一弹性人工
2、边界条件模拟地基辐射阻尼的影响。采用有限元强度折减法求解边坡稳定安全系数,以塑性区贯通时刻特征点的位移突变作为边坡失稳的评判标准。非线性有限元和黏.弹性人工边界条件结合运用,建立了基于静动力有限元的边坡抗震稳定分析方法。该方法在稳定安全系数的定义上和传统的刚体极限平衡法是一致的。以十里铺水电站为工程实例,分析了库区边坡的抗震稳定性,得出了边坡动力位移时程和动力稳定安全系数,计算结果合理评价了实际工程在地震荷载下的稳定性。关键词:地震;静动力有限元;边坡稳定;黏.弹性人工边界;有限元强度折减法;安全系数;十
3、里铺水电站中图分类号:TU352文献标识码:ASlopeaseismicstabilityanalysismethodbasedonstaticanddynamicfiniteelementsZHOUGui.yunl一,LITong.chun3(1.CollegeofCi“lEngineeringandArchitecture,JinlingInstituteofT∞.hnology,Nanjin9211169,Cllina;2.EngineeringInstituteofEngineeriIIgCorp
4、s,PLAUniversityofSciemeandTechnology,Nanjha9210007,China;3.CollegeofWaterConservancyandHydropowerEngineering,HohniUniversity,Nanjing210098,china)Abstract:Theseismicwaveisinputthroughartificialtruncatedboundaries.andthestressanddeformationoftheslopeinduced
5、byseismicloadingaredeterminedbytime·integrationmethod.1keffectoffoundationradiationdampingissimulatedbyadoptingviscoelasticartificialboundariesconditiononartificialtruncatedboundaries.Safetyfactorofslopestabilityissolvedbyfiniteelementsstrengthreductionme
6、thod.Thedisplacementsaltationoffeaturepointswhentheconnectionofplasticzoneoccu塔iscomideredasallinstabilitycriterionoftheslope.TheslopeaseismicstabilityanalysismethodbasedOilstaticanddynamicfiniteelementsiSputforwardthroughcombiningthedynamicfiniteelementm
7、ethodwiththeviscoelasticartificialboundariesconditions.Onthedefinitionofsafetyfactor,themethodisconsistent、ntllthetraditionalgadlimitequilibriummethod.Finally,takingShilipuHydropowerStationforexample,theslopedynamicstabilityofthereservoirslopeisanalyzed;a
8、ndthetimehistoryoftheslopedynamicdisplacementsandthesafetyfactorofdynamicstabilityareobtained.Thecalculationresultsagreeverywellwimgeologicalsurveyandareclosetotheactualsituation,SOastoindicatethatthemethodcallbeuse
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