Influence of Arch Foot Defect of Primary Support on Mechanical Behaviors of an Arch Frame in Underground Tunnels

Figure 9

Axial force temporal curves of bolt.

(a) Axial force temporal curves of crown bolt

(b) Axial force temporal curves of left arch waist bolt

(c) Axial force temporal curves of right arch waist bolt

(d) Axial force temporal curves of left arch foot bolt

(e) Axial force temporal curves of right arch foot bolt