Structural Mechanical Characteristics and Instability Law of Roof Key Block Breaking in Gob-Side Roadway

Figure 8

Displacement curve of measuring points at different positions of roadway. (a) Displacement curve of coal wall side measuring point in roadway. (b) Displacement curve of coal pillar side measuring point in roadway. (c) Displacement curve of roadway roof measuring point. (d) Displacement curve of roadway floor measuring point.

(a)

(b)

(c)

(d)