Study on design parameters for dam site based on maximum credible earthquake of near-field seismogenic structure
Yu Ruifang1 Zhang Cuiran2 Zhang Dongfeng1 Sun Jize3 Yu Yanxiang1
1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;
2. China Institute of Water Resources and Hydropower Research, Beijing 100048, China；
3. Shenzhen Academy of Disaster Prevention and Reduction, Shenzhen 518003, China
Abstract：For the damsites affected by near-field strong earthquakes, it is required to evaluate the ground motion parameters of dam site based on the maximum credible earthquake by current standard for seismic design of hydraulic structures. However, it is hard to be used in seismic design due to lack of reference guideline. A maximum credible seismic parameter evaluation method based on the stochastic finite fault method is proposed, in which the effects of source rupture, path attenuation and site conditions are considered. The proposed method was further applied in evaluating the seismic performance of the Xiluodu dam site. First, a near-fault seismic parameter evaluation system is established for the engineering site with complex seismic activity and geological environment. The new evaluation system includes the setting range and level of parameters for source, path and site condition, the design of ground motion simulation scheme. The site parameter evaluation criteria and the corresponding calculation principles for determining the weight coefficients of these parameters are considered. Then, the seismogenic structure in Xiluodu dam site is analyzed, and three main seismogenic structures and the maximum credible earthquake magnitude affecting the dam site are determined. Finally, the evaluation method of the maximum credible ground motion parameters of the dam site is discussed, and the design parameters considering different risk levels are proposed. In the proposed method, the complexity of the seismogenic structure of the dam site is considered and the influence of different sources on the seismic parameters of the dam site is reflected. The research results could provide credible ground motion input parameters for the hydraulic structure aseismic design.
俞瑞芳 张翠然 张冬锋 孙吉泽 俞言祥. 基于近场发震构造最大可信地震的坝址设计参数综合评价[J]. 土木工程学报, 2022, 55(3): 117-128.
Yu Ruifang Zhang Cuiran Zhang Dongfeng Sun Jize Yu Yanxiang. Study on design parameters for dam site based on maximum credible earthquake of near-field seismogenic structure. 土木工程学报, 2022, 55(3): 117-128.
