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对于长大深埋铁路隧道的工程地质勘察,音频大地电磁(AMT)已经成为目前最为行之有效的物探勘察手段之一。音频大地电磁(AMT)测深法利用天然电磁场信号为场源,观测天然电磁场的时间序列信号,然后将时间序列数据转化为频率域数据,进而计算出每个频点的电阻率值和相位阻抗。野外采集的时间序列原始数据,经过Robust处理和带地形的二维反演,能真实反应地下的地质信息。通过近几年在青海某铁路隧道等工程的应用,取得了较好的效果。
For the engineering geological survey of long and deep buried railway tunnels, the audio-terrestrial electromagnetic (AMT) has become one of the most effective geophysical prospecting methods at present. Audio Electromagnetic Field (AMT) sounding method uses the natural electromagnetic field signal as the field source, observes the time series signal of the natural electromagnetic field, then transforms the time series data into the frequency domain data, and then calculates the resistivity value and phase impedance of each frequency point . The time-series raw data collected in the field, after Robust processing and 2D inversion with terrain, can truly reflect the underground geological information. Through the application of a railway tunnel in Qinghai in recent years, the project has achieved good results.