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在分析隧道全空间瞬变电磁响应的基础上,提出了异常响应的比值分析法。利用围岩中低阻体的综合响应减去围岩响应,得到低阻体的响应,将低阻体的响应与围岩相除而得到相对异常值。利用相对异常值分析法,研究了围岩中柱状低阻体半径、厚度以及低阻体与激励源间距离的变化对瞬变响应信号的影响。低阻体半径越大,比值越大,最大异常出现的时间越晚;低阻体厚度越大,比值越大,最大异常出现的时间越晚;低阻体与激励源间的距离越小,比值越大,最大异常出现的时间保持不变。工程实际应用表明采用这种分析方法,更易从探测数据发现异常。
On the basis of analyzing the transient electromagnetic response in the tunnel, a ratio analysis method of abnormal response is proposed. The response of the low-resistivity body is obtained by the comprehensive response of the low-resistivity body in the surrounding rock, and the response of the low-resistivity body is divided by the surrounding rock to obtain the relative abnormal value. The relative outlier analysis method is used to study the influence of the radius and thickness of the columnar low resistance body in the surrounding rock and the change of the distance between the low resistance body and the excitation source on the transient response signal. The larger the ratio of the low resistivity body is, the larger the ratio is and the later the maximum anomaly occurs. The larger the thickness of the low resistivity body is, the larger the ratio is and the later the maximum anomaly occurs. The smaller the distance between the low resistivity body and the excitation source, The larger the ratio, the longer the maximum anomaly occurs. The practical engineering application shows that using this method of analysis, it is easier to find abnormalities from the sounding data.