Research Article

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

Figure 9

Overlying migration caused by mining in the 30503 working face. (a) H = −2 m. (b) H = 0 m. (c) H = 2 m. (d) H = 4 m. (e) H = 6 m.
(a)
(b)
(c)
(d)
(e)