基于设定地震场地相关反应谱的高土石坝抗震安全评价
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摘要
结合最新颁布的《水电工程水工建筑物抗震设计规范》(NB35047—2015)中关于甲类设防重大土石坝工程设计反应谱的规定,重点研究了基于设定地震的场地相关反应谱和一致概率反应谱确定的动参数下高土石坝的动力反应特征。通过240m高长河坝高心墙堆石坝在两种不同反应谱下设计和校核地震动下的计算分析发现一致概率谱得到的坝顶动力响应加速度、动位移、永久变形、坝坡安全系数和塑性滑移等关键安全评价指标均高于场地相关反应谱的结果,进而探讨了两种反应谱对长河坝高土石坝工程极限抗震能力的影响,计算结果表明采用基于设定地震的场地相关反应谱得到的坝体的极限抗震能力明显高于一致概率谱,采用一致概率谱得到的地震动参数进行长河坝抗震设计和抗震加固措施研究易得到较保守的结果。
Based on the provisions of "China's code for seismic design of hydraulic structures of hydropower project"(NB 35047-2015), the detailed effects of seismic parameters determined by use of different design response spectra including site-related response spectra based on scenario earthquake and probability-consistent response spectra on the safety evaluation of class A high rockfill dams located in highly seismic regions are studied. Comparisons of the key indexes such as dynamic response acceleration, permanent deformation, safety of impervious body, factor of safety and sliding displacement of the potential failure surfaces of 240 m-high Changhe core rockfill dam under the above-mentioned seismic parameters are provided. It is shown that the results from the probability-consistent response spectra are higher than those from the site-related ones. In addition, its ultimate seismic capabilities based on the above-mentioned two design response spectra are achieved. It is proved that the probability-consistent spectra adopted in the safety evaluation of high rockfill dams may result in conservative results.
Based on the provisions of "China's code for seismic design of hydraulic structures of hydropower project"(NB 35047-2015), the detailed effects of seismic parameters determined by use of different design response spectra including site-related response spectra based on scenario earthquake and probability-consistent response spectra on the safety evaluation of class A high rockfill dams located in highly seismic regions are studied. Comparisons of the key indexes such as dynamic response acceleration, permanent deformation, safety of impervious body, factor of safety and sliding displacement of the potential failure surfaces of 240 m-high Changhe core rockfill dam under the above-mentioned seismic parameters are provided. It is shown that the results from the probability-consistent response spectra are higher than those from the site-related ones. In addition, its ultimate seismic capabilities based on the above-mentioned two design response spectra are achieved. It is proved that the probability-consistent spectra adopted in the safety evaluation of high rockfill dams may result in conservative results.
引文
[1]陈厚群,李敏,石玉成.基于设定地震的重大工程场地设计反应谱的确定方法[J].水利学报,2005(12):1399-1404.(CHEN Hou-qun,LI Min,SHI Yu-cheng.Determination of design response spectrum for important structures based on scenario earthquake[J].Journal of Hydraulic Engineering,2005(12):1399-1404.(in Chinese))
[2]NB 35047-2015水电工程水工建筑物抗震设计规范[S].2015.(NB 35047-2015 Code for seismic design of hydraulic structures of hydropower project[S].2015.(in Chinese))
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[7]中国水利水电科学研究院,四川省长河坝水电站筑坝材料静动力特性试验分析研究[R].北京:中国水利水电科学研究院,2015.(China Institute of Water Resources and Hydropower Research.Study on the static and dynamic characteristic test of construction material in changhe dam[R].Beijing:China Institute of Water Resources and Hydropower Research,2015.(in Chinese))
[8]陈生水,李国英,傅中志.高土石坝地震安全控制标准与极限抗震能力研究[J].岩土工程学报,2013,35(1):59-65.(CHEN Sheng-shui,LI Guo-ying,FU Zhong-zhi.Safety criteria and limit resistance capacity of high earth-rock dams subjected to earthquakes[J].Chinese Journal of Geotechnical Engineering,2013,35(1):59-65.(in Chinese))
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[10]LI Hong-jun,ZHONG Hong,CHI Shi-chun.Study on the ultimate aseismic capacity of high core rock-fill dam[C]//Geotechnical Special Publication No.215,ASCE.2011:124-134.
[2]NB 35047-2015水电工程水工建筑物抗震设计规范[S].2015.(NB 35047-2015 Code for seismic design of hydraulic structures of hydropower project[S].2015.(in Chinese))
[3]陈厚群,李敏,张艳红,等.地震危险性分析和地震动输入机制研究[R].北京:中国水利水电科学研究院.2001.(CHEN Hou-qun,LI Min,ZHANG Yan-hong,et al.Earthquake-resistant analysis on high arch dam and study on the dynamic stability of dam abutment[R].Beijing:China Institute of Water Resources and Hydropower Research.2001.(in Chinese))
[4]兰宏亮,许丽萍,崔永高.一致概率谱衰减指数的取值方法探讨[J].震灾防御技术,2009(3):335-339.(LANHong-liang,XU Li-ping,CUI Yong-gao.Discuss of method to determine consistent spectra decaying constant[J].Technology for Earthquake Disaster Prevention,2009(3):335-339.(in Chinese))
[5]中国水利水电科学研究院.四川省长河坝水电站坝址区场地相关设计反应谱研究[R].北京:中国水利水电科学研究院,2016.(China Institute of Water Resources and Hydropower Research.Research on the site-related response spectrum of Changhe dam in Sichuan Province[R].Beijing:China Institute of Water Resources and Hydropower Research,2016.(in Chinese))
[6]中国地震局地质研究所.大渡河流域长河坝水电站工程场地地震安全性评价和水库诱发地震评价报告[R].北京:中国地震局地质研究所,2006.(Seismic safety evaluation of changhe dam under site related seismic and reservoir-induced earthquake[R].Beijing:,2006.(in Chinese))
[7]中国水利水电科学研究院,四川省长河坝水电站筑坝材料静动力特性试验分析研究[R].北京:中国水利水电科学研究院,2015.(China Institute of Water Resources and Hydropower Research.Study on the static and dynamic characteristic test of construction material in changhe dam[R].Beijing:China Institute of Water Resources and Hydropower Research,2015.(in Chinese))
[8]陈生水,李国英,傅中志.高土石坝地震安全控制标准与极限抗震能力研究[J].岩土工程学报,2013,35(1):59-65.(CHEN Sheng-shui,LI Guo-ying,FU Zhong-zhi.Safety criteria and limit resistance capacity of high earth-rock dams subjected to earthquakes[J].Chinese Journal of Geotechnical Engineering,2013,35(1):59-65.(in Chinese))
[9]赵剑明,刘小生,陈宁,等.高心墙堆石坝的极限抗震能力研究[J].水力发电学报,2009,28(5):98-102.(ZHAOJian-ming,LIU Xiao-sheng,CHEN Ning,et al.Research on the maximum anti-seismic capability of high earth core rock-fill dam[J].Journal of Hydroelectric Engineering,2009,28(5):98-102.(in Chinese))
[10]LI Hong-jun,ZHONG Hong,CHI Shi-chun.Study on the ultimate aseismic capacity of high core rock-fill dam[C]//Geotechnical Special Publication No.215,ASCE.2011:124-134.