Analysis on Influence Factors of Roadway Instability in High-Stress, Steeply Inclined Extra-Thick Coal Seam

Figure 20

Horizontal stress distribution of strike surrounding rock with different advancing distances. (a) Advance 50 m. (b) Advance 100 m. (c) Advance 150 m. (d) Advance 200 m.

(a)

(b)

(c)

(d)