Analysis on Stability of Narrow Coal Pillar Influenced by Main Roof Fracture Structure of Gob-Side Roadway

In order to master the law of the main roof fracture structure affected to the stability of the narrow coal pillar, the rock structure surrounding mechanical model of gob- side entry driving was built, three kinds of main roof fracture structure were presented. There were many differences in pillar stress and deformation of su rrounding rock in gob- side roadway when the main roof fracture location were different. It was unfavorable to roadway maintenance if the fracture line was right above gob- side roadway; it was favorable to roadway maintenance if the fracture line was outside of coal pillar. The results showed that the distance between the center line of No. 8105 headentry in Yanjiahe Mine and the gob- edge was 8. 5 m, coal pillar width was 6. 5 m, the maximum roof- to- floor convergence was 420 mm, the maximu m rib- to- rib convergence was 600 mm, the stability of the gob- side roadway was effectively controlled.