北京大学学报（自然科学版）2019，Vol.55Issue(5)：828-837,10.DOI:10.13209/j.0479-8023.2019.072
高架桥下方高铁地震信号频谱特征研究
Spectral Characteristics of High-Speed Rail Seismic Signal under Viaduct
摘要
Abstract
Employing a total of 10461 seismic records induced by 951 high-speed trains recorded by 11 short-period stations of a temporary array deployed by Peking University under the high-speed railway viaduct, we observe how the spectral characteristics vary with the speed and model of the train as well as the rail and groundsill by using a clustering algorithm K-Means. For a high-speed train in uniform motion, the spectrum of the produced seismic wave is mainly composed of nearly equally spaced peaks and its fundamental frequency is equal to the ratio of the train speed to the carriage length. By aligning the fundamental frequency, the influence of the train speed is reduced to make the spectrum pattern time-independent and easy for comparison. Clustering results show that the spectra of the high-speed rail seismic events have stable patterns when the train model, rail and groundsill conditions keep the same; the stable spectrum patterns change significantly with the change of the train model, rail and groundsill conditions. The monitoring of the stable spectral characteristics might possibly be used in safety control of high-speed rail.关键词
高铁/ 震源/ 频谱/ 聚类Key words
high-speed rail/ seismic source/ spectrum/ clustering algorithm引用本文复制引用
蒋一然,鲍铁钊,宁杰远,张献兵..高架桥下方高铁地震信号频谱特征研究[J].北京大学学报（自然科学版）,2019,55(5):828-837,10.基金项目
国家自然科学基金(41874071)资助 （41874071）
