Study of a no-pillar mining technique with automatically formed gob-side entry retaining for longwall mining in coal mines

To reduce the roadway drivage ratio, drivage cost, and safety accidents, and increase the resource recovery ratio, a no-pillar mining technique with automatically formed gob-side entry retaining is proposed for longwall mining. In this technique, pressure is offloaded via directional roof cutting, and a roadway is automatically formed via the ground pressure and rock breaking expansion. These processes permit the implementation of a new longwall...