Transient Electromagnetic Response Characteristics and Probing Practices of Shallowly Buried Unexploded Ordnance
In order to search an effective method for unexploded ordnance buried in the ground,the opposing coils transient electromagnetic method was used for experiments.The transient electromagnetic detection test includes changing the current intensity of the trans-mitting coil and changing the direction of the survey line,where the survey line is arranged along the long and short axes of the known unexploded ordnance.The test results show that the current intensity of the emitting coil and the direction of the different excitation fields have obvious differences in the abnormal morphology of the transient electromagnetic re-sponse field along the long axis and the short axis of the unexploded ordnance.The multi-track curve shape of the short-axis survey line is more complicated;in the early stage,the multi-track curve of the long-axis line mainly presents a single-peak anomaly,the peak value is located above the unexploded ordnance,and the anomaly is relatively simple,and the multi-track resistivity contour curve is concave in a"U"shape,and the center of the concave is located above the unexploded ordnance.The test results are applied to the actual detection of unexploded ordnance.During the construction,a large emission current was used to ap-propriately change the direction of the survey line in case of complex abnormalities with a good detection effect.
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