Abstract:In order to scientifically mine the near-surface broken orebody and ensure the safety of surface structures, the combination of rock drilling and filling method and upward approach filling method is proposed. FLAC3D software was used to simulate the whole process of excavation and filling under different quarry structural parameters of the two scenarios, and to analyze the stability of the quarry perimeter rock and the ground surface. The results show that: when mining with the two structural parameters of 6m (width)×10m (height) for segmented rock drilling and segmented mine subsequent filling method and 4m (width)×4m (height) for upward approach filling method, the phenomena of top and bottom sinking and bottom bulging are not obvious, the range of stress concentration of the ore column is the smallest, and there is no large area of plastic zone penetration in the mine peripheral rock, so the overall solidity is the best; After the end of mining, the maximum settlement displacement of the surface is 4.27mm, the maximum value of inclination is 0.101mm/m, the maximum value of curvature is 0.842mm/m2, and the maximum value of horizontal deformation is 0.056mm/m. The results of the analysis of various indexes show that the mining of the ore body in accordance with the design scheme has very little impact on the surface buildings and structures. The study may provide experience in mining back similar ore bodies.
