Study on the Application of Gob-Side Entry Retaining via Roof Cutting under the Condition of a Hard Thick Roof

Figure 8

Mechanical model of the retaining gangue: (a) collapse stage of gangue, (b) mechanical model of collapse stage, (c) stable stage of gangue rib, and (d) mechanical model of stability stage.

(a)

(b)

(c)

(d)