Rib Control Technology of Gob-side Entry Retaining in High Stress Soft Rock Roadway

In order to explore the contral technique of gob- side entry retaining rib under the condition of high stressed soft rock, taking the No. 1111 coal mining f ace of Zhuji Mine as a study object, the numerical simulation and rib stress measurement were applied to study the rib damage form and stress state and plastic stress distribution in gob- side entry retaining. A reinforcement enhanced treatment was conducted in the predicted serious failure area. A measure with three rows of the anch or beams for the special location reinforcement was conducted for the reinforcement treatment and was applied to control one sidewall deformation at the middle sectio n of the gateway sidewall non mining behind and at the floor corner along the gateway. The site observation results showed that the displacement of two ribs of roadwa y in the front of working face was large, the maximal value was 513 mm, and displacement of two ribs of roadway in the behind of working face was small, the maximal value was 432 mm.