Influence of Three-Dimensional Stress Field Variation on Fracture Evolution Characteristics of a Roof

Figure 15

Variation of plastic zones in the surrounding rock mass of the entry: (a) damage of the 1305 head entry; (b–d) 1306 transport lane destruction, wherein the angle of the principal stress rotation is 0°, 10°, and 20°, respectively.

(a)

(b)

(c)

(d)