地震地磁观测与研究2023，Vol.44Issue(5)：107-117,11.DOI:10.3969/j.issn.1003-3246.2023.05.013
用自然电位估算地铁干扰大小
Estimating the magnitude of subway interference using spontaneous potential—Taking Tianjin Tanggu Seismic Station as an example
摘要
Abstract
Metro stray currents can cause changes in surface potential and cause harm.Its magnitude is related to factors such as track insulation and vehicle speed,making it difficult to directly measure.Based on the characteristics that natural potential is not only a response to the conductivity distribution of underground media but also a response to field sources(current sources),the"track earth"model is used to calculate the maximum stray current generated by a single train passing through the Tanggu Seismic Station on the nearest ground line,which can reach 50 A.Based on the characteristics of the subway's"daily operation and night stop",a segmented study was conducted on the natural potential data of Tanggu Seismic Station.It was estimated that the average stray current of the subway is about 33.15 A,and the average potential change caused is about 0.68 mV.The maximum daily interference time pattern of subway operation was also obtained.To accurately evaluate the impact of subway operation on geoelectric observation,a scientific transformation plan is proposed to provide a theoretical basis.关键词
自然电位/地铁杂散电流/电位变化Key words
spontaneous potential/metro stray current/potential change引用本文复制引用
刘建波,雷生学,张明东,刘文兵,刘金城,马义山..用自然电位估算地铁干扰大小[J].地震地磁观测与研究,2023,44(5):107-117,11.基金项目
天津市地震局科研项目(项目编号:Yb202301) （项目编号:Yb202301）
"天津及周边地区地震风险预测技术研究"科技创新团队项目 （）
