Due to the disorderly mining of coal mines,many tunnels and goafs have been left,which bring great hidden dangers to the current urban construction in our country.In order to investigate the hidden goaf dangers in a construction site in Changchun,transient electromagnetic exploration is carried out in the survey area.Preliminary investigation of the stratum distribution in the survey area is conduc-ted,and two anomalies caused by roadways are found and the anomaly range is delineated.Drilling veri-fication results show that the hidden dangers in goaf area inferred by the transient electromagnetic method are basically consistent with the drilling,and the effect is remarkable.This method has a good application prospect.
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