Abstract
In this paper, a numerical calculation model of the mining face was established to analyze the rational size of coal pillars in the goaf on both sides by using FLAC3D based on the mining geological conditions in the pilot area. Furthermore, the feasibility of co-ordinated reinforcement with steel pipe column was explored, which can be applied to the recycling of residual coal resources like protecting coal pillars and of great value to increase the recovery rate in gobs as well.
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