A case study: Study on the fracture evolution of overlying strata and the law of surface subsidence caused by coal resource mining

The continuous goaf area formed by coal resource mining is too large, which makes the roof movement characteristics of goaf become extremely complex. Based on the engineering background of 3104,3106 and 3107 working faces in Menkeqing Coal Mine, this paper studies the roof activity and surface subsidence of large goaf. In this study, microseismic monitoring, 3DEC numerical simulation and field measurement methods were used to analyze the overburden movement and surface subsidence of large goaf. The results show that with the advance of mining in 3107 working face, the microseismic event intensive area gradually develops from 17.35 m to high rock strata, and finally reaches 48.05 m. 3104 goaf roof caving zone, fractured zone height ; the position of the maximum settlement value is shifted from the middle of the 3107 goaf to the side of the 3104 goaf, and finally tends to be gentle in the middle of the 3106 goaf, and the position of the maximum settlement value of the strike side line gradually shifts to the side of the 2201 goaf. The research results can provide reference for the safe and efficient mining of coal resources and have important engineering practical significance.