高面板堆石坝抗震安全评价标准与极限抗震能力研究

Criteria for seismic safety evaluation and maximum aseismic capability of high concrete face rockfill dams

针对强震区高面板堆石坝的特点,提出了基于稳定、变形、面板防渗体系安全的高面板坝抗震安全评价和极限抗震能力分析方法,并建议了坝坡抗震稳定、坝体局部动力稳定、坝体地震残余变形、面板防渗体系的抗震安全评价标准。对坝高超过250 m的某高面板堆石坝进行了极限抗震能力分析,根据坝坡稳定性、地震残余变形、单元抗震安全性、面板防渗体系抗震安全性等多角度的评价结果,初步认为,该高面板堆石坝的极限抗震能力为0.50g^0.55g。

By considering the characteristics of high concrete face rockfill dams located in the strong earthquake areas, an analysis method to evaluate the seismic safety evaluation and the maximum aseismic capability of high concrete face rockfill dams is proposed. The evaluation emphasis focuses on the stability, deformation and safety of the concrete face impervious system, which are the decisive factors of the aseismic safety of concrete face rockfill dams. A series of evaluation criteria for dam slope dynamic stability, element aseismic safety, earthquake-induced permanent deformation and aseismic safety of concrete face impervious system are proposed. The proposed evaluation method and criteria have been successfully applied to the maximum aseismic capability evaluation of a high concrete face rockfill dam more than 250 m in height. Based on the comprehensive results, the maximum aseismic capability of this concrete face rockfill dam is evaluated to be about 0.50g-0.55 g.