Research Article
Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine
Figure 10
Crack types in the surrounding rock of the roadway: (a) crushing area; (b) circumferential crack; (c) longitudinal crack; (d) oblique crack; (e) various cracks.
(a) |
(b) |
(c) |
(d) |
(e) |