Effects of Construction Sequences and Volume Loss on Perpendicularly Crossing Tunnels

Figure 2

Elevation views of S1 and S2 (schematic diagram). (a) Tunnelling sequence S1 (Section A-A). (b) Tunnelling sequence S2 (Section A-A). (c) Tunnelling sequence S1 (Section B-B). (d) Tunnelling sequence S2 (Section B-B).

(a)

(b)

(c)

(d)