Overall Design and Optimization of Mining Sequence in High-Stress Environment of Thick Orebody

Abstract

After entering deep mining, the stress concentration level because of engineering excavation is considerably greater than the strength of the engineering rock mass. Here, we consider the engineering impact of a high stress environment in the deep mine plan, integrate the high-stress environment and its evolution with the mining process into the mining plan, and realize the balance of improving the stress state and getting the maximum net present value. Using Map3d boundary element simulation software, we planned two vertical and four horizontal mining sequences for deep and thick orebody backfill mining, respectively, and then analyzed the changes in stress and rock mass energy because of mining disturbance. The results show that the surrounding mining sequence can effectively improve the mining stress environment and increase production capacity. Using large-spaced dispersion and mining sequence from the middle to both ends can gradually redistribute the stress to adjacent areas, thus reducing the degree of stress concentration.

Optimum Selection of Mining Plans for Pillars Containing Interlayers Based on Numerical Simulation

“…Numerical simulations have been also used to study the mining sequence of pillars, and Shan et al [19] used Map3d boundary element simulation software to study the two vertical and four horizontal mining sequences of ore body backfill mining. Huang et al [20] used FLAC3D to study the influence of different mining sequences on the stability of coal pillars.…”