outsized section

Arch cross-section tunnel

arched section tunnel

cross tunnel section

horseshoe section tunnel

horse-shoe section tunnel

Large Cross Section Tunnel

LARGE CROSS-SECTION TUNNEL

Large cross-section tunnel kiln

Large Section Tunnel

large section tunnel advance

LARGE-SECTION TUNNEL

length of the tunnel section

light section tunnel

long square-section tunnel

poor geological tunnel section

Shallowly embedded big fracture section tunnel

Small Cross Section Tunnel

Special Section Tunnel