Experimental Analysis of Deformation Mechanics and Stability of a Shallow-Buried Large-Span Hard Rock Metro Station

Figure 12

Excavation sequence sketch of the arch-cover method. (a) Initial excavation face. (b) Area 1 left excavated. (c) Area 1 right excavated. (d) Area 2 excavated. (e) Area 3 excavated. (f) Area 4 excavated.

(a)

(b)

(c)

(d)

(e)

(f)