北京大学学报（自然科学版）2024，Vol.60Issue(3)：521-527,7.DOI:10.13209/j.0479-8023.2024.033
高铁地震波场的高精度密集观测及应用前景:基于通讯光缆的观测和处理结果
High Precision and Dense Observation of High-Speed Rail Seismic Wavefield and Its Application Prospects:Observation and Processing Results Based on Communication Optical Cable
摘要
Abstract
The high-precision distributed acquisition of high-speed rail seismic waves were achieved using the High-Definition Distributed Acoustic Sensing(HD-DAS)system.The sensor unit used simple communication optical cable to achieve good monitoring effects at low cost,and could be easily deployed according to actual environmental conditions,greatly improving the efficiency of field observation work.By using multiple parallel optical cables,noise could be effectively suppressed and the signal-to-noise ratio of high-speed rail seismic signals can be improved.Data analysis and processing were performed on seismic signals collected by HD-DAS from high-speed rail.The analysis revealed that the signals display discrete spectral characteristics.Further analysis was conducted on the attenuation law of seismic wave signals,and the transmission speed of seismic waves near the surface was obtained through the frequency-wavenumber spectrum.This indicated that the high-speed rail seismic wave signals acquired through optical fiber could be used to detect underground structures and monitor changes in the medium's state,thereby enhancing the safety of high-speed rail operations.关键词
分布式光纤声波传感/高铁地震/应变量/分立谱Key words
distributed fiber-optic acoustic sensing/high-speed rail seismic/strain/discrete spectrum引用本文复制引用
何向阁,石永祥,苏青青,张敏,卢海龙..高铁地震波场的高精度密集观测及应用前景:基于通讯光缆的观测和处理结果[J].北京大学学报（自然科学版）,2024,60(3):521-527,7.基金项目
国家自然科学基金(62105007)资助 （62105007）
