Stabilization Mechanism and Safety Control Strategy of the Deep Roadway with Complex Stress

Figure 15

The plastic zone distribution of the roadway. (a) λ = 1.0; (b) λ = 1.2; (c) λ = 1.4; (d) λ = 1.6; (e) λ = 1.8; and (f) λ = 2.0.

(a)

(b)

(c)

(d)

(e)

(f)