Calculation Model and Influencing Factors of Surrounding Rock Loosening Pressure for Tunnel in Fold Zone

Figure 9

Relationship between tunnel buried depth h and horizontal loosening pressure e of surrounding rock. (a) Horizontal pressure at the top of the tunnel. (b) Horizontal pressure at the bottom of the tunnel. 1— = 1.0; 2— = 1.1; 3— = 1.2; 4— = 1.3; 5— = 1.4; 6— = 1.5.

(a)

(b)