Investigation of the Optimal Layout of the Roadway in Closely Spaced Ultra-Thick Coal Seams Mining with Remaining Coal Pillars

Figure 12

Deformation of the roadway under different layouts of the return air roadway. (a) Roof deflection. (b) Floor deflection. (c) Deformation of the left side. (d) Deformation of the right side.

(a)

(b)

(c)

(d)