Analysis of Influencing Factors of Roadway Stability and Adaptability Criterion for Gob-Side Pre-Backfill Driving

Figure 16

Schematic diagram of different fracture positions of the main roof. (a) The fracture position of the main roof is far away from the backfill. (b) The fracture position of the main roof is close to the backfill. (c) The main roof breaks at the goaf side of the backfill wall.

(a)

(b)

(c)