Hidden trouble of water gushing at coal face always results in water gushing accidents, which will discontinue the production and even cause mine flooding and accidents with casualties. In order to ensure mining safety at the coal face, it is of great significance to find out distribution condition of hidden trouble of water gushing from the coal face in advance, and then take effective prevention and control measures. This article introduces principles, methods, technologies and application effects of several electromagnetic methods for detection of hidden trouble of water gushing at coal face, and lays emphasis on expounding method principles and effects of down-hole detections by electric transmission tomography and transient electromagnetic method. Potential of point power supply in the underground homogeneous semi-spoce, as well as response to a low-resistivity abnormal body in the homogeneous semi-space, is simulated by adopting 3-D finite element method to interpret basic theory of the electric transmission tomography. It is shown by the results of aetua| measurement that the mine electromagnetic method is sensitive to water-bearing low-resistivity body and can play a unique role in detecting hidden trouble of water gushing at coal face.
coal face hidden trouble of water gushing high-density resistivity method electric transmission tomography 3-D finite element simulation mine transient electromagnetic method
SHI Xianxin YAN Shu CHEN Mingsheng FU Junmei
Xian Branch,China Coal Research Institute,Xian 710054,Shaanxi,China;School of Electronic and Infor School of Computer Science and Telecommunication Engineering,Jiangsu University,Zhenjiang 212013,Jia Xian Branch,China Coal Research Institute,Xian 710054,Shaanxi,China School of Electronic and Information Engineering,Xian Jiaotong University,Xian 710049,Shaanxi,Chin