Numerical Simulation of Transient Electromagnetic Response Characteristics of Mine Gob Water
CHANG Jianghao
YU Jingcun
JIANG Zonglin
Abstract：The water filling into the gob is seriously imperiling the follow-up production of a mine. Based on the diffusion theory of electromagnetic field and by using the finite difference time domain method, a two-dimensional whole-space geological model was built and study was made on the transient electromagnetic response characteristics of gob water. The result showed that the incentive source in the mine roadway excited not only a secondary induction field in the rock mass in front of the roadway head, but also a secondary induction field in the surrounding rock behind the roadway head, the maximum contour loops moved upwards and then downwards from the incentive source, and their intensity gradually weakened. The diffusion velocity of the mine TEM field was affected by the electrical parameter of surrounding medium, it was slower in the low-resistance medium and faster in the high-resistance one, the low-resistance body in front of the roadway head had an obvious influence on the whole-space TEM field. When a low-resistance body existed in the geologic body, the isoclines of the electric field near it became more intensive, the gradient increased, the diffusion velocity reduced, the eddy-current density increased and the attenuation became slower.
Keywords：transient electromagnetic methodgob waterresponse characteristicsnumerical simulation
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 4-8 )