Study on Identification of Construction Method for Ultra-Large-Span Tunnel

Figure 1

Five types of tunnel cross section. (a) With span of 6 m. (b) With span of 9 m. (c) With span of 12 m. (d) With span of 15 m. (e) With span of 18 m.

(a)

(b)

(c)

(d)

(e)