Failure Characteristics and Confined Permeability of an Inclined Coal Seam Floor in Fluid-Solid Coupling

Figure 4

Plastic failure zone of workface floor along the inclined direction of the coal seam with the advancement of the workface. (a) Before workface mining. (b) Advanced 20 m of workface. (c) Advanced 40 m of workface. (d) Advanced 60 m of workface. (e) Advanced 80 m of workface. (f) Advanced 100 m of workface.

(a)

(b)

(c)

(d)

(e)

(f)