Numerical simulation analysis of mining schemes for complex residual pillars in multiple intermediate sections

A mine used the sublevel open stope method and short-hole shrinkage method for mining, and after years of mining, the four underground middle stopes have basically completed mining, forming a large goaf area and high-grade ore columns.With the change of mine resource endowment conditions, the recovery of this part of high-grade ore column resources is conducive to the sustainable development of enterprises and can greatly improve the economic benefits of enterprises.By comprehensively analyzing the distribution of residual ore resources, mining technical conditions, goaf distribution and stability, this paper formulates the goaf treatment and ore column recovery scheme.And establish a three-dimensional mechanical model, verify the feasibility of the scheme through numerical calculation, and provide a technical reference for mine column recovery.