Abstract:
As an indispensable element in backfill operations, the backfill bulkhead serves a crucial role in isolating the goaf, ensuring that the backfill slurry remains contained within the goaf, and mitigating potential hazards arising from its leakage. Based on the properties of backfill slurry in Fengshan Copper Mine, this paper analyzed the lateral pressure distribution on the backfill bulkhead under different backfill heights and obtained the relationship between the total pressure and maximum bending moment on the backfill bulkhead and changes in the backfill height. Consequently, it was concluded that the maximum backfill height of each filling should not exceed 1.5 m. Drawing inspiration from both Chinese and international expertise in constructing backfill bulkheads and based on the actual conditions of the Fengshan Copper Mine, construction techniques for cast-in-place reinforced concrete bulkheads, brick masonry bulkheads, and steel-supported flexible bulkheads were proposed. In combination with the mine’s existing technical equipment, detailed construction procedures for the three types of backfill bulkheads were determined. A brief analysis was conducted on the application of backfill bulkheads at the Fengshan Copper Mine, and it was recommended that the future optimization direction for bulkhead construction should focus on flexible bulkheads. Through theoretical and procedural research on the construction of backfill bulkheads at the Fengshan Copper Mine, this paper can provide valuable engineering experience for other metal mines.