瞬变电磁隧道超前预报成像技术-中国地球物理学会地球物理科技推广.PDF

51 3 　　　　　 Vol.51, No.3 2008 5 CH INES E　JOURNAL　OF 　GEOPH YSICS M ay, 2008 , 　.., 2008, 51(3):894 ～900 X e G Q, Li X.The technology of TEM t nnel prediction imaging.Chinese J .Geop hys.(in Chinese), 2008, 51(3):894～ 900 1 2 薛国强, 李　貅 1 , 　100029 2 , 　710054 　　, .;, “”, . ., . ., . 　, , , 　0001-5733(2008)03-0894-07 　P631 2007-03-12, 2008-01-10 The technology of TEM tunnel prediction imaging 1 2 XUE G o-Qiang , LI Xi 1 Institute of Geology and Geop hy sics, Chinese Academy of Sciences, Beij ing 100029, China 2 S chool of Geology and S urvey Eng ineering, Changan University, X i′an 710054, China Abstract 　In order to solve the problem of fast and effective detection of the w ater-bearing str ct re ahead of t nnel w all, w e try to introd ce the transient electromagnetic method (TEM ), w hich is sensitive to w ater-bearing str ct res, into t nnel condition w orking.In this paper, w e give the TEM t nnel prediction config ration.After analyzing the special condition of t nnel location, w e introd ce “moving plate” theory and create the imaging system of TEM prediction based on the parameter of secondary differential cond ctivity.We ded ce the non-linear f nction of cond ctivity and magnetic response excited by imaginary eq ivalent plate so rce.By introd cing an a xiliary parameter, w e obtain the parameter of cond ctivity by sing Genetic algorithm.We at last draw the imaging section with the parameter of secondary differential cond ctivity .N mer