叶巴滩高拱坝抗震安全分析与评价

叶巴滩高拱坝是《水电工程水工建筑物抗震设计规范》(NB 35047-2015)在2015年9月1日正式颁布实施后,水电水利规划设计总院审查批复同意的第一座高坝水电站工程。新规范在地震输入、材料参数取值、设防等级、评价方法等多个方面进行了修订,本文介绍了按照新规范要求进行的叶巴滩拱坝动力分析与抗震安全评价的研究成果,以及采取的相应抗震措施。根据分析成果综合评判可知,叶巴滩拱坝基础约束区、上游坝踵区域、下游面坝体中部以及左右岸拱座抗力体是分析得出的拱坝抗震关键部位,在设计地震作用下大坝是安全可靠的,在最大可信地震作用下大坝也能够保持稳定。

Seismic Safety Analysis and Evaluation of Yeba Beach High Arch Dam

Yeba Beach high arch dam is the first high dam hydropower project approved by China Renewable Energy Engineering Institute after “Code for Seismic Design of Hydraulic Structures for Hydropower Projects” (NB 35047-2015) formally promulgated and implemented on September 1, 2015. The new code was changed and revision in many aspects, including seismic input, material parameters, seismic grade, evaluation methods and others. This paper introduces the results of the dynamic analysis, seismic safety evaluation and measures taken by the Yeba Beach arch dam in accordance with the new code. According to the comprehensive analysis of the results, it shows that the base constraint area, dam heel, middle part of downstream face and the right and left bank dam abutment resisting force body is key parts of arch dam earthquake resistance, and Yeba beach arch dam is safe and reliable under design earthquake, it also can keep steady under maximum credible earthquake