Abstract:
The KJ959 microseismic monitoring system was used to monitor microseismicity and the development of water-conducting fracture zones during the recovery of the III633 working face of Zhuzhuang Coal Mine. The energy,time distribution,development height,and spatial distribution patterns of microseismicity were analyzed. It is concluded that the number and energy of microseismic events are closely related to mining activities. Microseismic events during the recovery mainly occur on the roof of the longwall face. The maximum damage depth within the floor is about 25-30 m,which does not affect the main water-bearing layer. Fractued zoon developed up to 37 m into the roof. The fracture mining ratio is about 13.2. This study provides a reference basis for the subsequent recovery and further development of the mine water control program.