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《Progress in Geophysics》 2007-06
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3D finite difference time domain numerical simulation for TEM in-mine

YUE Jian-hua,YANG Hai-yan,Hu Bo(School of Resource and Earth Science,China University of Mining&Technology,Xuzhou 221116,China)  
A 3D finite difference time domain(FDTD) solution was presented and Mur absorbing boundary condition was deduced.The whole-space response characteristics for three dimensional conductive body located in the floor of the mine drift either in homogeneous medium or in layered medium was simulated,with using Mur absorbing boundary condition and taking a electrical dipole source in homogeneous whole space as a initial source;the diffused regularity of the transient field in homogeneous medium at 1.9 μs and 27.6 μs,and in layered medium at 1.2 μs and 0.023 ms was discussed.Simultaneously,the results indicate that,it is not visible to electric field affected by laneway at early times,this influence displays after 20 μs;transient field has a high resolution capability to low-resistivity layer,and also has a high penetrative capability to high-resistivity layer;Therefore,it is sensible to low-risistivity body;Mur absorbing boundary condition can achieve better results in a big modeling region and more grid elements.This provides a theoretical basis for the interpretation of TEM measurement in mine.
【Fund】: 博士点基金项目(20050290501);; 国家自然科学基金项目(40674074)联合资助
【CateGory Index】: P631.3
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