Response characteristics of collapse column in coal mining working face by geoelectric transillumination method

Geoelectric transillumination techniques are important tools for rich water structure investigations in coal mining work. To improve the application effect of this method, we researched the response characteristics of collapse column in coal mining working face based on FDTD numerical modelling with the singularity removal technique. We analysed impacts of some parameters such as spatial position, height, sectional area, resistivity of collapse column on electrical response of collapse column. The simulation result shows that the electrical response of "Through" type and "Concealed" type collapse column is inversed. The increasing of sectional area can enhance the exceptional response. The height of collapse column has a little impact on exceptional response for "Through" type collapse column. The curves of two injecting points of near collapse column can be used to locate flat position of collapse column. For " concealed " type collapse column, difference between the curves of two injecting points of near collapse column is unapparent, which can be used to judge the anomalous body is "through" type or " concealed " type. Exploration effect of geoelectric transillumination method apply to "Through" type collapse column is superior to "concealed" type.