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3 不同厚度、不同埋深塌陷体OCTEM响应
Fig.3 OCTEM responses of different size target collapse under different depths