[Retracted] Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face

Figure 4

Distribution characteristics of minimum principal stress under different propulsion distances: (a) advance 32 m, (b) advance 96 m, (c) advance 160 m, (d) advance 224 m, (e) advance 228 m, and (f) advance 352 m.

(a)

(b)

(c)

(d)

(e)

(f)