等值反磁通瞬变电磁法在公路隧道塌陷区的探测应用

刘杰, 段炜, 王俊, 刘成, 戴国强

The application of opposing coils transient electromagnetic method to the detection of underground collapse in highway tunnel under construction

LIU Jie, DUAN Wei, WANG Jun, LIU Cheng, DAI Guo-Qiang

图1 OCTEM线圈及其径切面一次场磁力线

Fig.1 OCTEM coils and its primary magnetic field line on the diametric plane