高拱坝抗震安全研究

我国是多地震国家,高坝大库多建于西部强震区,其中坝高超过200 m的大坝多为混凝土拱坝,其抗震安全至关重要。结合2018年11月颁布实施的《水工建筑物抗震设计标准》(GB 51247—2018)的编制工作,在高拱坝抗震方面取得的主要研究成果,包括大坝抗震设防水准框架、大坝地震动参数的合理确定、大坝地震动输入机制、大坝—地基系统整体抗震稳定分析和大坝坝体强震损伤破坏机理分析,据此提出了最大可信地震下高拱坝抗震安全定量评价指标。

Study on seismic safety of high arch dam

China is a country with high seismicity，while high arch dams in China are mostly constructed in the highly seismic regions in the Western China，in which the dams with the height over 200 m are mostly the concrete arch dams，thus the seismic safeties of them are quite important. In combination with the compilation of the“ Standard for Seismic Design of Hydraulic Structures”issued and implemented in November 2018 as well as the main study results obtained from the aspect of seismic resistance of high arch dam including the framework of seismic fortification level，the reasonable determination of the seismic ground motion parameters，the seismic motion input mechanism，the seismic stability analysis on the entire dam-foundation system and the analysis on the damage and failure mechanism under strong earthquake，the quantitative evaluation indexes for the seismic safety of high arch dam under the maximum credible earthquake are put forward herein.