水力发电2024，Vol.50Issue(12)：44-50,7.
基于谱元法的溪洛渡拱坝近场地震动模拟
Near-field Ground Motion Simulation of Xiluodu Dam Based on Spectral Element Method
摘要
Abstract
The seismic safety of high dams is a inevitable problem for water conservancy projects to be built in strong earthquake areas such as the west.In order to reflect the specific seismic characteristics and site influence,a spectral element numerical model of seismic source-medium propagation-site is constructed to simulate the process of seismic wave from source excitation to medium propagation and then to site,and then the ground motion parameters required by the project are generated.The seismic source model adopts kinematic source,the source is dispersed into several sub-sources by using finite fault method,and non-uniform medium wave velocity structure in Xiluodu area is constructed using data fusion method.The high-precision topographic data is used to consider complex local site canyon topography,and the actual earthquake in Yongshan County is chosen to compare the measured values with the simulated results,which verifies the rationality and accuracy of the seismic source model.Then,according to the actual geological fault information in Xiluodu area,the potential near-field earthquakes in Xiluodu are simulated after determining the potential focal location,and determining the focal depth,slip distribution and initial rupture point considering the most unfavorable situation,and the ground motion characteristics of the site are compared.Finally,it is determined that the source with the greatest influence on the Xiluodu arch dam is the latent source where the middle branch of the Leibo fault is located.关键词
谱元法/波场模拟/震源机制/最大可信地震/溪洛渡拱坝Key words
spectral element method/seismic wave field simulation/focal mechanism/maximum credible earthquake/Xiluodu Arch Dam分类
天文与地球科学引用本文复制引用
彭志豪,徐艳杰,侯信超,时洪涛,黄海龙..基于谱元法的溪洛渡拱坝近场地震动模拟[J].水力发电,2024,50(12):44-50,7.基金项目
国家自然科学基金资助项目(52192672) （52192672）
中国长江三峡集团有限公司科研项目(XLD/2117) （XLD/2117）
