Abstract:In the experiment,the variation in resistivity of different rock samples during the complete stress-strain process under the water-filling condition is studied;and the variation rule of conductivity of water conducting fractures formed in floor during the mining activity is obtained. In addition,the geoelectric model for dynamic evolution of mining induced water conducting fractures is constructed. From the numerical modeling with 3D electrical resistivity software,the response characteristics of apparent resistivity of water conducting fractures in coal seam floor are achieved,which can provide a theoretical basis for designing the data acquisition system and data processing. Based on the theory of full-space high-accurate 3D electrical resistivity method,the principles and technical requirements for designing the dynamic monitoring system of water conducting fractures are put forward,which have been successfully used in a certain coal mine in Anhui Province. The result shows that the application of 3D electrical resistivity in detecting the evolution of water conducting fractures in coal seam floor is effective;and it can present the failure mode of coal seam floor in mining process;so it is quite favorable for schemes of predicting and preventing water inrush from coal seam floor.