Near crushing mechanism of gangue-containing coal seams and parameter optimization for combined fully mechanized caving

Fully mechanized caving is the most popular method for safe and efficient coal mining in China. In this study, based on geological conditions of Workface 822 Yuandian No. 1 Mine, we used theoretical analysis numerical simulation to analyze crushing mechanism gangue-containing seam roofs, discuss mechanical model stability seams simulate different methods intervals, optimize parameters from seams. The results indicated that under action mining-induced stress, peak pressure support less than rupture stress gangue, relying mine alone can promote roof coal. However, it difficult gangue roof; owing seams, area where damage coefficient at upper end lower further expanded front entire support, effect greatly weakened. After comparing effects five modes, finally decided use single-cycle interval mode. minimum content Mine 54.35%. study provide a basis experience-based reference