摘要
大坝抗震性能评估能够综合分析坝体在不同地震动强度地震动作用下发生的震损情况及可能造成的震害风险,是近年来坝工领域抗震研究的热点之一。鉴于目前近场地震作用下坝体的抗震研究相对较少,讨论近远场地震动作用下某高面板堆石坝大坝的易损性和震害风险的差异。通过采用增量动力分析方法(IDA)得到坝体的易损性曲线,并根据坝址地震概率模型得到近远场地震作用下的坝体震害风险。研究结果表明,相较于远场地震,近场地震对高面板堆石坝的易损性更高,造成的震损程度更大。大坝在近场地震作用下发生严重破坏的风险值为0.083,对应大坝的震害风险为不太可能状态。近场地震动情况下大坝发生轻微破坏、中等破坏和较重破坏的震害风险概率比远场地震动作用下的各个性能水准对应的震害风险概率略高,说明仅考虑远场地震动作用会低估土石坝震害风险概率。高面板堆石坝的地震易损性分析和震害风险评估能够对大坝抗震性能进行系统的综合性评估。研究结果可为坝址在近断层区域的大坝抗震设计和加固提供参考。
The seismic performance assessment of dam can comprehensively analyze the seismic damage of dam under different ground motion which can produce the possible seismic damage risk.Seismic risk is one of the hot topics in the field of the dam engineering in recent years.The seismic performance of the typical high concrete-face rockfill dam under near field earthquakes which include dam fragility and seismic damage risk is researched.The fragility curve of the dam is obtained by utilizing the incremental dynamic analysis(IDA)method.The seismic risk of the dam under the near field and far field earthquakes are obtained by the seismic probability model of the dam site.The results illustrate that the near field earthquakes are more fragility to the high concrete-face rockfill dam compared with the far-field earthquakes.The risk value of serious damage of the dam under near field earthquakes is 0.083,which means the corresponding risk is unlikely statue.In the case of near filed earthquakes,the risk probability of slight damage,moderate damage and heavy damage of the dam are slightly higher than that of the each performance level under the action of far field earthquakes,which indicates that the seismic risk probability of the high concrete-face rockfill dam will be underestimated only considering the far field earthquakes.The seismic fragility analysis and seismic risk assessment of the high concrete-face rockfill dam can systematically evaluate the seismic performance of the dam.This study can provide some references for the seismic design and reinforcement of the dam in the near fault area.
作者
韩晓育
郭颍奎
HAN Xiao-yu;GUO Ying-kui(School of Hydraulic Engineering,Yellow River Conservancy Technical Institute,Kaifeng 175004,China;Kaifeng Water Ecological Restoration Engineering Technology Research Center,Kaifeng 475004,China;School of Civil Engineering and Communication,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)
出处
《水电能源科学》
北大核心
2022年第1期98-102,共5页
Water Resources and Power
基金
河南省科技攻关项目(142300410177)
黄河水利职业技术学院青年骨干教师培养计划(2020HYGG02)。
关键词
近场地震
IDA方法
易损性分析
性能评估
near fault earthquake
IDA method
fragility analysis
performance assessment
