芦山地震冶勒大坝强震监测资料分析
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摘要
冶勒沥青混凝土心墙堆石坝最大坝高为124.5 m,坝址区地震烈度高,地质条件复杂,两岸坝基条件严重不对称。大坝上布设了9台强震仪组成的强震监测台阵,曾获得2008年汶川地震和攀枝花地震的大坝强震监测记录。2013年4月20日四川省雅安市芦山县发生里氏7.0级地震,冶勒大坝距震中约212.5 km,坝址区震感较为强烈,强震监测台阵获得了此次地震较为完整的有效记录。对芦山地震主震记录进行时域分析和频谱分析,总结冶勒大坝在芦山地震中的动力反应规律,并与汶川地震时坝体动力反应进行对比分析。研究表明,芦山地震主震时冶勒大坝最大加速度记录为47.043 cm/s2,最长持续时间为76.98 s,坝顶动力放大效应明显;芦山和汶川地震时大坝动力反应规律的差异与地震波频谱特性及大坝自振特性等密切相关。总体而言,冶勒大坝在震后运行安全稳定,芦山地震未对冶勒大坝造成明显不利影响。
Yele Dam is a rockfill dam with an asphaltic concrete core wall. The maximum dam height is 124.5 m. The geological conditions are quite complex and have high seismic intensity. The foundation along the river is seriously asymmetry. The earthquake monitoring station has nine strong motion seismographs on Yele dam. They obtain seismic response records during Wenchuan earthquake and Panzhihua earthquake in 2008. A M7.0 earthquake occurred in Lushan county, Ya'an city, Sichuan province on April 20, 2013. Yele dam was shocked relatively strongly at a distance of 212.5 km away from the epicenter and the earthquake monitoring station obtained the relatively complete and effective records. Based on monitoring data, the time domain analysis and spectrum analysis of the main shock are discussed. Regularities of the dynamic response of Yele dam during the earthquake are summarized. The dynamic responses of Yele dam during Lushan earthquake and Wenchuan earthquake are compared. The results show that the maximum acceleration record due to Lushan earthquake on Yele dam is 47.043 cm/s2, the longest duration is 76.98 s, and the amplification effect at dam crest is obvious. Seismic wave spectral characteristics and vibration characteristics have greater impact on the differences of dam dynamic response during Lushan earthquake and Wenchuan earthquake. Overall, it is concluded that Yele dam remains in normal working state and Lushan earthquake doesn't cause significant adverse effects on the dam.
Yele Dam is a rockfill dam with an asphaltic concrete core wall. The maximum dam height is 124.5 m. The geological conditions are quite complex and have high seismic intensity. The foundation along the river is seriously asymmetry. The earthquake monitoring station has nine strong motion seismographs on Yele dam. They obtain seismic response records during Wenchuan earthquake and Panzhihua earthquake in 2008. A M7.0 earthquake occurred in Lushan county, Ya'an city, Sichuan province on April 20, 2013. Yele dam was shocked relatively strongly at a distance of 212.5 km away from the epicenter and the earthquake monitoring station obtained the relatively complete and effective records. Based on monitoring data, the time domain analysis and spectrum analysis of the main shock are discussed. Regularities of the dynamic response of Yele dam during the earthquake are summarized. The dynamic responses of Yele dam during Lushan earthquake and Wenchuan earthquake are compared. The results show that the maximum acceleration record due to Lushan earthquake on Yele dam is 47.043 cm/s2, the longest duration is 76.98 s, and the amplification effect at dam crest is obvious. Seismic wave spectral characteristics and vibration characteristics have greater impact on the differences of dam dynamic response during Lushan earthquake and Wenchuan earthquake. Overall, it is concluded that Yele dam remains in normal working state and Lushan earthquake doesn't cause significant adverse effects on the dam.
引文
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[2]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.XIONG Kun,HE Yun-long,ZHANG Yan-feng.Recorded seismic response of Yele dam in 5·12 Wenchuan earthquake[J].Chinese Journal of Geotechnical Engineering,2008,30(10):1575-1580.
[3]郝元麟,何顺宾.冶勒水电站枢纽布置设计[J].四川水力发电,2003,22(4):26-30.HAO Yuan-lin,HE Shun-bin.General layout design of Yele hydropower station[J].Sichuan Water Power,2003,22(4):26-30.
[4]曹学兴,何蕴龙,熊堃,等.汶川地震对冶勒大坝影响分析[J].岩土力学,2010,31(11):3542-3548.CAO Xue-xing,HE Yun-long,XIONG Kun,et al.Effects of Wenchuan earthquake on Yele dam[J].Rock and Soil Mechanics,2010,31(11):3542-3548.
[5]徐锡伟,陈桂华,于贵华,等.芦山地震发震构造及其与汶川地震关系讨论[J].地学前缘,2013,20(3):11-20.XU Xi-wei,CHEN Gui-hua,YU Gui-hua,et al.Seismogenic structure of Lushan earthquake and its relationship with Wenchuan earthquake[J].Earth Science Frontiers,2013,20(3):11-20.
[6]许亮华,郭永刚,杜修力.水工建筑物强震动加速度记录的分析处理[J].地震工程与工程振动,2012,32(5):26-32.XU Liang-hua,GUO Yong-gang,DU Xiu-li.Data processing and analyzing of strong motion acceleration records obtained from hydraulic structures[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(5):26-32.
[7]陈建春,高福荣,汪洵波.试论冶勒大坝地震动力反应分析[J].水力发电,2008,34(11):55-60.CHEN Jian-chun,GAO Fu-rong,WANG Xun-bo.Seismic dynamic response analysis for Yele dam[J].Water Power,2008 34(11):55-60.
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