Research Article
Deformation Rules for Surrounding Rock in Directional Weakening of End Roofs of Thin Bedrocks and Ultrathick Seams
Figure 7
Breaking law of immediate roof. (a) Before the first break, (b) after the first break, (c) before the second break, and (d) after the second break.
(a) |
(b) |
(c) |
(d) |