| The water flowing fractured zone is one of the main water-filled channels in the mine working face,and its development height is of great significance to the safe mining of the working face and the water conservation and coal mining in ecologically fragile mining areas.In this paper,taking the 112201 working face of Xiaobaodang Coal Mine as the research area,the development characteristics of the roof water flowing fractured zone during the mining process of the working face were studied by using microseismic monitoring and resistivity monitoring technology,and The development characteristics and water-rich conditions of the water flowing fractured zone during the mining process were analyzed.and the research has certain theoretical and practical significance.The main results of the research are as follows:(1)The geological conditions and physical properties of the study area were analyzed,and the combined well-ground observation system was adopted to determine the seismic wave velocity model through calibration shot analysis,and the monitoring work was carried out for about 1030 hours.The effective microseismic events and the first arrival time were identified and picked up from the microseismic data,and 4950 effective microseismic events were obtained through parameters such as travel time and energy.Research and analysis show that:microseismic events mostly occur in the mining face,with an elevation of 950～1150m;the development height of the water flowing fractured zone is about 210m,and the advanced development distance is about 50～80m,and most of them develop above the working face and along the two sides of the trough.Areas with an included angle of less than 60°.(2)Analyzed the distribution characteristics of formation electrical properties in the study area,established different geoelectric models of the working face before and after mining,and simulated the electromagnetic response characteristics of the geoelectric model through forward modeling.The EH4 imaging system was used to mine the study area.Resistivity monitoring work before and after harvesting;comparative analysis of the electrical development characteristics before and after harvesting.The results show that the water flowing fractured zone has not developed to the weathered bedrock aquifer,and the water flowing fractured zone formed by coal seam mining is poor in water richness.(3)The results of comprehensive research and the analysis of existing geological data suggest that the development height of the water-conducting fracture zone in the study area changes from high to low from the inside to the outside of the working face;the development height of the water flowing fractured zone is about 220m;Mining has basically no impact on the Salawusu aquifer. |
