Analysis of Fracture Characteristics and Evolution Laws of Overlying Strata in Gangue Filling Mining Face

To study the failure and deformation laws of overlying strata under filling and mining conditions, this paper uses the on-site monitoring method to arrange the overburden observation drillings at different locations of the F5001 filling working face of a mine, and to determine the overburden damage by drilling imaging, and analyze the filling and mining rock rupture characteristics and motion evolution process. The results show that the overburden has a tendency to transform into a rupture zone and a rupture zone to the separation layer after entering the transitional stage of the separation layer. Three new rupture zones can occur within the first 24 hours; the separation layer generally appears at the boundary of different lithology. The cracks often appear in the thicker rock layers; there are 3 separated layers and 8 obvious rupture zones in the overlying rock above the T₃150 drainage roadway. The number of cracks is more, the maximum rupture height above the roof is about 14.2 m, and the maximum separation height is about 11.3 m.