Study on the Evolution Rule of Land Damage Based on Electrical Resistivity Imaging Technology in Mining Face

The exploitation of underground resources can lead to overburden deformation and destruction, surface subsidence with fissure development. In order to reveal the evolution laws of land damage in mining process, the paper used resistivity imaging technology to test the spatio-temporal evolution of surface soil cracks caused by underground mining. Access to land under the influence of mining damage evolution process of the whole cross-section resistivity data volume. Grasp the spatio-temporal evolution of electrical resistivity at overlying geotechnical and surface fissures during the entire mining process. The results show that: With the advance of working face, dynamic cracks in mining appear one or more “cracking–closing” processes. Dynamic fissures always develop ahead of the current working location, advance angle of break is approach to vertical angle. It indicates that dynamic fissures have fast “selfhealing” features and manual repairmen might not be necessary. Electrical resistivity imaging technology is sensitive to the change of soil micro structure. The development and failure depth of cracks in layered soil can be accurately reflected. At the same time, the deformation and failure of overlying surrounding rock caused by mining influence can also be obtained through this monitoring method. The electrical data monitoring results are basically consistent with the results obtained by actual close-range photography technology, indicating that it is feasible to use the resistivity imaging technology to monitor the evolution law of land damage caused by mining of working face. This achievement and understanding can provide technical support for the study of land ecological damage caused by coal mining.