Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

The coal pillar stress distribution at the 311102 working face in Bayangaole Mine is analyzed and revealed. In addition, borehole stressmeter, PASSAT monitoring system, numerical modelling are fully utilized. Based on patterns of acoustic wave velocity distribution, it discovered that impact created by mining activity can expand into around 40 m, where peak concentration found about 15 m ahead. According to stressmeter readings, mildly impacted, ordinarily severely impacted zones distinguished. equilibrium theory corresponding calculation indicated body front has a plastic zone width 4.96 m. stress-displacement analysis based simulation showed relationship between vertical unimodal bimodal. Specifically, both 5 10 wide pillars stress-width correlation stresses all located center, whereas bimodal relationship. comparison, holds maximum in-situ stress. consideration site conditions economic influences, 6 strip designed 311102. As result, stopping was successfully completed, remarkable benefits were achieved.