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

Figure 13

Excavation sequence sketch of the primary support arch-cover method. (a) Initial excavation face. (b) Area 1 excavated. (c) Area 2 excavated. (d) Area 3 and 4 excavated. (e) Primary support conducted. (f) Area 5 excavated. (g) Area 6 excavated. (h) Area 6 excavated. (i) Side-wall primary support.

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