Experimental Study of Mechanical Characteristics of Tunnel Support System in Hard Cataclastic Rock with High Geostress

Figure 13

Variation curves of steel frame’s stress of initial support. (a) Outer flange of section A. (b) Inner flange of section A. (c) Outer flange of section C. (d) Inner flange of section C.

(a)

(b)

(c)

(d)