In the detection of a subsidence area, for the purpose of accurately determining whether there are holes in the backfill area, the CSAMT and the transient electromagnetic method shall be selected for integrated detection based on the geological and field conditions, and the analytical results show that the detecting results of the two methods are basically identical, as shown by analyzing the abnormal characteristics of the typical sectional profile, but each has its own characteristics: The depth of CSAMT method is deeper than that of TEM, and the judgment of the abnormal area is relatively accurate, the resolution of TEM is better than that of CSAMT, but the detection depth is shallow, the depth of exploration is easily affected by the physical properties of the medium within the target depth and the shallow has a blind area. The drilling through the abnormal areas of the judgement shows that the detection results are accurate, and that the integrated geophysical method is accurate and effective in the survey of collapse of backfill area.
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