Abstract: Regarding the problem of slope stability of open-pit mining areas that restricts the safety of mining operations, a typical soil landslide in a certain mine in Tongling area was selected as the research object. Multi-electrode resistirity method was adopted for systematic exploration. By setting up multiple measurement lines across different parts of the landslide body, high-resolution apparent resistivity data were obtained. Combined with the results of geological drilling and surface investigation, the 2D inversion resistivity profile was comprehensively interpreted. The results show that Multi-electrode resistirity method effectively reveals that the landslide body has a "relatively high resistivity - low resistivity - relatively high resistivity" three-layer electrical structure in the vertical direction, corresponding to the surface loose slid⁃ ing body, the middle saturated and weak zone (potential sliding zone), and the lower stable sliding bed. This method clearly depicts the spatial boundaries of the landslide body, the undulation morphology and burial depth characteristics of the sliding surface (zone), and identifies the local water-rich areas within the land⁃ slide body. Practical results demonstrate that the Multi-electrode resistirity method has significant advan⁃ tages in terms of speed, economy, non-invasiveness and high resolution in the exploration of soil landslides in open-pit mining areas, and can provide a basis for the analysis of the cause mechanism, stability evalua⁃ tion and prevention engineering design of such landslides.

Key words: Multi-electrode resistirity method, soil landslide, open-pit mine, slope stability of slip