Abstract:
As a key project in mining operations, vertical shafts play a crucial role in the safe and efficient production organization of enterprises. This paper took the main shaft support of a certain mine as the research object and carried out the engineering practice of steel arch ring reinforcement for shaft support. Through multi-factor evaluation such as the analysis of rock structure and failure mechanism of the shaft formation, stability evaluation, and technical and economic comparison, the design scheme of a full-section steel arch ring combined with shotcrete and anchor mesh support for the main shaft was ultimately selected. The steel arch rings were made of 18a channel steel, with a vertical layer spacing of 1 m; the vertical connections between the arch rings were made of 12 channel steel, with a horizontal spacing of 1 m; the steel arch rings were fixed with
ϕ38 mm round steel by lower supporting and upper pressing, with a horizontal spacing of 2 m. The parameters for shotcrete and anchor mesh support were 0.8 m × 0.8 m–1.0 m × 1.0 m. A single layer of steel mesh was laid, and C20 concrete was used. The spraying thickness was based on completely wrapping the ring beams and mesh. In this project, the production was centrally shut down for 55 days, and a total of 74 steel arch rings were installed in 5 stages, which not only ensured the engineering quality, but also greatly shortened the absolute construction period. At the same time, it ensured the stability and safe operation of the main shaft, creating favorable conditions for the project in the mining area to reach the production standards. Since the end of the reinforcement treatment, there have been no cracking, deformation, or displacement phenomena in the shaft wall, which is sufficient to demonstrate that the application practice of the reinforcement scheme achieves the expected target effects. It is hoped to provide a reference for the reinforcement design and construction of vertical shaft projects under similar conditions.