RESEARCH ON DETECTION OF LOW RESISTIVITY INTERBED IN FRONT OF TUNNEL FACE BY MEANS OF TRANSIENT ELECTROMAGNETIC METHOD
SU Maoxin1，LI Shucai1，XUE Yiguo1，LI Xiu2，ZHANG Qingsong1
(1. Research Center of Geotechnical and Structural Engineering，Shandong University，Jinan，Shandong 250061，China； 2. College of Geology Engineering and Geomatics，Chang'an University，Xi'an，Shaanxi 710054，China)
Abstract：Practices show that the unfavorable geological body with water or mud in front of the tunnel face is great dangerous to the tunnel construction. If these unfavorable geologic bodies can not be detected，which will effect the tunnel construction progress；moreover，some engineering accidents and casualties may happen. As the transient electromagnetic method(TEM) is sensitive to the low resistivity body，and the unfavorable geological bodies usually can be equal to a low resistivity interbed，the study of the detection of the low resistivity interbed in front of the tunnel face becomes very meaningful. The TEM-equivalent conductive plane method based on the whole space theory and the apparent longitudinal conductance and its differential coefficient imaging will be used to have a forward modeling and application research on the detection of the low resistivity interbed in front of the tunnel face. Besides，a discussion on the electricity interface response character of the apparent longitudinal conductance is presented with differential coefficient imaging and the interpretation combined with apparent resistivity section contours. At last，some characteristics and laws of the detection are summed up so as to guide the actual TEM tunnel geological forecast and improve TEM detection accuracy and precision.
苏茂鑫，李术才，薛翊国，李貅，张庆松. 隧道掌子面前方低阻夹层的瞬变电磁探测研究[J]. 岩石力学与工程学报, 2010, 29(S1): 2645-2650.
SU Maoxin1，LI Shucai1，XUE Yiguo1，LI Xiu2，ZHANG Qingsong1 . RESEARCH ON DETECTION OF LOW RESISTIVITY INTERBED IN FRONT OF TUNNEL FACE BY MEANS OF TRANSIENT ELECTROMAGNETIC METHOD. , 2010, 29(S1): 2645-2650.
