Temporal and Spatial Effect of Surrounding Rock and Supporting Construction of a Large Soil Tunnel

Figure 3

Process drawing of secondary lining: (a) tying of reinforcement, (b) clamping of secondary lining back arch, (c) pouring of secondary lining back arch, (d) pouring of road surface, (e) tying of ring reinforcement, (f) ring clamping, (g) pumping of concrete, (h) ring dismantling of mold, and (i) maintenance.