The research on electrode systems of 3D tunnel DC focused method
In the tunnel forward detection methods, DC resistivity method will have a good application foreground because of its simple principle and operation, and lateral focused resistivity method has become a method in well logging use. This paper studies the electrode combination of 3D tunnel DC focused method. At first, the authors calculate and analyse the current distribution of two point power sources with the same electrical property, and indicate that as currents exclude each other, current density has a maximum at a certain depth along the perpendicular bisector of the two point power sources and the depth is directly proportion to the distance between them. Based on the above reasons, the authors work out three kinds of electrode combinations: four-point power source, five-point power source and nine-point power source. In addition, the spacial potential distributions of the three kinds of electrode systems are calculated by 3D FEM,and we can find that the nine-point power source mode has a good current focused effect. Furthermore, when the main electrode current is less than the shield electrode current, the focused effect is the best.
forward surveying resistivity method DC focused method
RUAN Baiyao QIANG Jianke Shen Ping
Department of Resources & Environmental Engineering, Guilin University of Technology,Guilin,China Key Laboratory of Geological Engineering Centre of Guangxi Province,Guilin,China;School of Info-Phys School of Info-Physics and Geomatics Engineering, Central South University,Changsha,China
国际会议
The 19th International Workshop on Electromagnetic Induction in the Earth(第十九届国际地球电磁感应学术研讨会)
北京
英文
777-781
2008-10-23（万方平台首次上网日期，不代表论文的发表时间）