Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar

Figure 10

Stress state on rock surrounding vents while advancing the working face. (a) 24 m from face end to pillar. (b) 16 m from face end to pillar. (c) 8 m from face end to pillar. (d) 0 m from face end to pillar. (e) −8 m from face end to pillar. (f) −17.5 m from face end to pillar.

(a)

(b)

(c)

(d)

(e)

(f)