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瞬变电磁技术是针对堤坝隐患实施实时无损探伤的一种有效手段,可以有效地分析出堤坝中电导率发生异常的部位。现有大多数瞬变电磁(TEM)仪器检测到的是感应电动势信号,由于根据感应电动势信号通常只能初步判断有无隐患以及隐患发生的大概范围,难于进行隐患的快速定位。为对隐患进行精准定位,尚需对信号进行时深转换,但现有转换方法难于满足实际工程对定量精度的要求。针对目前在信号分析上存在的难定量的问题,对其采集信号的快速反演技术进行研究,提出通过计算信号的全区视电阻率并对其进行基定系数修正,来得到堤坝的视深度以及其对应的视电阻率,最终得到堤坝的地电断面图的方法,为堤坝除险加固提供理论基础和科学依据。
Transient electromagnetic technology is an effective measure to implement real-time non-destructive testing of hidden dangers of embankments, which can effectively analyze the parts where conductivity is abnormal in embankments. Most of the existing TEMs detect the induced electromotive force signal. Since the potential of the induced electromotive force signal can usually be used to determine the hidden trouble and the approximate range of the hidden trouble, it is difficult to quickly locate the hidden trouble. In order to accurately locate the hidden trouble, the time-to-depth conversion of the signal still needs to be performed, but the existing conversion method is difficult to meet the requirements of the quantitative accuracy of the actual project. Aiming at the difficult problem existing in signal analysis at present, the rapid inversion technique of the collected signal is studied. It is proposed that the apparent depth of the dam can be obtained by calculating the apparent apparent resistivity of the signal and modifying its base coefficient. As well as its corresponding apparent resistivity, and ultimately get the dike section of the geoelectric method for the dam reinforcement and provide the theoretical basis and scientific basis.