Research Article

Study of the Construction Sequence of Overlapping Tunnels by the Shield Tunneling Method: A Case Study of the Longest Overlapping Tunnel in China

Figure 7

(a) Contour map of the vertical displacement of the stratum after excavation of the lower tunnel. (b) Contour map of the vertical displacement of the stratum after excavation of the upper tunnel (h: the distance between the upper and lower tunnels).
(a)
(b)