Study on surrounding rock disturbance effect of multi-middle section combined backfilling mining in inclined iron ore

As a high-efficiency and low-consumption mining mode, multi-middle section combined backfilling mining (MMSCBM) is becoming more and more widely used in metal mines. The geological mining conditions of Baixiangshan Iron Mine were taken as the simulation prototype. Similar model tests and numerical simulation experiments were used to study the surrounding rock disturbance, stope stability, surrounding rock stress, overburden settlement, and dynamic deformation of the ground surface during the MMSCBM process. The evolution process of the stope instability: the stable stage of the pillar, the large deformation stage of the pillar, the failure of some pillars, and the overall failure of the pillar. MMSCBM effectively buffered the excavation’s disturbance to the surrounding rock, adjusted the stress release mode, and changed the stress concentration area. The dynamic deformation laws of the overburden and the surface were summarized. The method of field monitoring was verified by numerical simulation calculation to study the disturbance degree of MMSCBM to the roadway and evaluate the safety of the roadway. This research has important significance and value for the wider application of the mining model.