Abstract: According to the frequency and harmfulness of rock burst in coal pillar, two kinds of pillar design methods were proposed for rock burst prevention based on mechanical elastic-plastic model. The width of yield pillar and load pillar were calculated separately with mechanics method, which considered the rock burst prevention and the theoretical formula of reasonable width was obtained. Based on the practical geological situation, the optimized plan was selected to carry out, and then the seismic activity and frequency of rock burst were contrasted. The result showed that the risk of rock burst was greatly decreased after the pillar width optimized. The research provided a basis for determining reasonable pillar width for rock burst prevention, with a certain theoretical significance and practical value.

Key words: Mining engineering, Rock burst, Rock burst prevention, Coal pillar width