Numerical Analyses on Deformation and Failure Characteristics of Surrounding Rock of Gob-Side Entry Retention by Roof Cutting

Figure 13

Borehole televiewer images and damage of surrounding rock: (a) the section with 790 m offset from the open-off cut; (b) the borehole spreading pictures; (c) the cracks in the middle of the roadway roof; (d) the rib spalling in the curved coal wall.

(a)

(b)

(c)

(d)