Rationality Analysis of Chain Pillar Setting Width at Large Mining Height and Large Span Mining Face

In order to solve reasonable coal pillar width setting problem in Hongliulin 5^# coal seam, taking 25202 working face as engineering background, coal pillar setting width is 14.8 m through plastic limit equilibrium theory; and abutment pressure distribution features of different coal pillar widths were simulated to ensure the stability of roadway when reasonable coal pillar setting width was 15 m, and the results were consistent with field data.