汶川地震冶勒大坝动力响应规律分析
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摘要
冶勒大坝为沥青混凝土心墙堆石坝,最大坝高124.5 m,坝基地质条件复杂。该坝址距"5.12"汶川大地震震中约258 km,地震发生时坝区有强烈震感,大坝强震监测台阵获得了主震较为详细的地震记录。采用三维非线性动力有限元方法对冶勒大坝在"5.12"汶川地震主震作用下的动力反应进行分析。分析时,以基岩实测加速度时程作为地震动输入,最大峰值加速度为11.968g,持续时间为124.4 s。有限元动力计算结果与监测资料反映规律吻合较好,获得了冶勒大坝与一般土石坝不同的地震动力反应规律:大坝地震响应分布从左岸到右岸逐渐增大且横河向地震响应较大,这种特殊的反应规律与冶勒大坝左右岸基础严重不对称的特殊地质条件密切相关。
Yele dam is a rockfill dam with an asphaltic concrete core.The maximum dam height is 124.5 m,and the geological conditions of its foundation are complex.The dam area with an epicentral distance of about 258 km was shocked strongly during Wenchuan Earthquake,and the monitoring station on the dam obtained records of the main earthquake.The 3D FEM nonlinear dynamic analysis was adopted to analyze the seismic response of the dam.and the recorded accelerogram on the bedrock was used as the input earthquake motion.It was found that the peak acceleration was 11.968 gal and the duration was 124.4 s.The analysis results were in good agreement with the actual seismic records,which were different from the common rockfill dam.The seismic response of the dam increased gradually from the left bank to the right bank,and the response in the longitudinal direction was comparatively large.The peculiar features of the dam's seismic response were closely related to the special geological condition that the foundation of the dam was unsymmetrical seriously in the both bank.
Yele dam is a rockfill dam with an asphaltic concrete core.The maximum dam height is 124.5 m,and the geological conditions of its foundation are complex.The dam area with an epicentral distance of about 258 km was shocked strongly during Wenchuan Earthquake,and the monitoring station on the dam obtained records of the main earthquake.The 3D FEM nonlinear dynamic analysis was adopted to analyze the seismic response of the dam.and the recorded accelerogram on the bedrock was used as the input earthquake motion.It was found that the peak acceleration was 11.968 gal and the duration was 124.4 s.The analysis results were in good agreement with the actual seismic records,which were different from the common rockfill dam.The seismic response of the dam increased gradually from the left bank to the right bank,and the response in the longitudinal direction was comparatively large.The peculiar features of the dam's seismic response were closely related to the special geological condition that the foundation of the dam was unsymmetrical seriously in the both bank.
引文
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[2]Guo Yonggang.Observation and Instrument of strong earth-quake motion in Hydroelectric Engineering[J].Progress inGeophysics,2005,20(2):422-426.[郭永刚.水利水电工程强震监测和强震监测仪器[J].地球物理学进展,2005,20(2):422-426.]
[3]韦凤年.分析总结汶川地震经验教训.加紧组织水工抗震设计规范修订——访中国工程院院士陈厚群[J].中国水利,2008(11):3-4.
[4]Chen Shengshui,Huo Jiaping,Zhang Weimin.Analysis ofeffects of“5.12”Wenchuan Earthquake on Zipingpu Con-crete Face Rock-fill Dam[J].Chinese Journal of Geotechni-cal Engineering,2008,30(06):795-801.[陈生水,霍家平,章为民.“5.12”汶川地震对紫坪铺面板坝的影响及原因分析[J].岩土工程学报,2008,30(06):795-801.]
[5]中国水利水电科学研究院.地震危险性分析和地震动输入机制的研究[A].北京:中国水利电力科学研究院.“九五”国家重点科技攻关项目成果汇编[C],1999:102-136.
[6]Chen Xugao.Monitoring desgin of Yele Dam with asphalticconcrete core[J].Sichuan Water Power,2003,22(04):50-53.[陈绪高.冶勒水电站沥青混凝土心墙堆石坝监测设计[J].四川水力发电,2003,22(04):50-53.]
[7]Bobby O Hardin,Vincent P Drnevich.Shear Modulus anddamping in soils design equations and curves[J].Journal ofSoil Mechanics and Foundations Division,1972.9006(SM7):667-691.
[8]Xiao Wei,Li Tailai,Huang Chenhu.Seismic response andfoundation liquefaction analysis of rockfill dam[J].Rockand Soil Mechanics,2008,29(Supp):155-160.[肖伟,李泰来,黄臣虎.堆石坝地震响应和地基液化分析[J].岩土力学,2008,29(Supp):155-160.]
[9]Xiong Kun,He Yunlong,Zhang Yanfeng.Recorded seismicresponse of Yele Dam in 5.12 Wenchuan Earthquake[J].Chinese Journal of Geotechnical Engineering,2008,30(10):1575-1580.[熊堃,何蕴龙,张艳锋.“5.12”汶川大地震时冶勒大坝实测动力反应[J].岩土工程学报,2008,30(10):1575-1580.]
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