Research on the development law of water-conducting fracture zone of overburden in coal seam group mining

Based on the engineering background of Lijiaou Mine, the development law of water-conducting fracture zone of overburden in coal seam group mining is studied through theoretical analysis, analog simulation and field measurement. Based on the research, the calculation method of the height of water conduction fissure caused by close seam mining is given, and the reliability of the calculation method is verified by similar simulation and field measurement. The results show that the height of overlying rock water-conducting fracture zone calculated according to the location of key layer and cumulative equivalent mining height is more scientific and accurate.