To improve the stability of the surrounding rock in the stopes of lines 61-65 in the Makeng Iron Mine, the Mathews stability graph method and FLAC3D numerical simulation were comprehensively used. A stress-displacement analysis model was established, and the effects of stope structural parameters (length, width, height) on the stability of the surrounding rock were systematically studied. The results show that during the mining process, the roof is dominated by tensile stress concentration, while the side walls exhibit compressive stress concentration. The stope width plays a dominant role in the stress distribution of the roof. The stope length significantly affects the displacement and stress release of the side walls. Shortening the stope length significantly reduces the displacement of the side walls and the risk of caving, which enhances the stope stability. The parameter combination of 20 m×10 m×54 m (length×width×height) has the best effect in controlling the stress concentration of the roof and the deformation of the side walls. Reducing the mining height to 36 m inhibits the horizontal displacement to a certain extent. However, the risk of roof caving remains high in the fractured rock mass area, indicating that solely adjusting the mining height is difficult to solve the local stability problem. Based on the zoning design of rock mass quality, a slicing scheme was proposed. By optimizing the parameters of the fracture zone and shortening the stope length, this scheme effectively mitigates the problem of side wall caving in the 63-1R section. The research results provide a theoretical basis for the structural optimization and surrounding rock stability control of stopes in the Makeng Iron Mine.

Fractured orebody  /  Mathews stability graph method  /  Surrounding rock stability  /  Stope structural parameter  /  Slicing scheme  /  Numerical simulation