Diversion Tunnel with Small Section
Small Cross Section Tunnel
super-large cross-section tunnel with low height-span ratio
Hard Rock Roadway with Small Cross-Section
Steep Inclined Shaft with Small Cross-Section
Arch cross-section tunnel
Large Cross Section Tunnel
LARGE CROSS-SECTION TUNNEL
Large cross-section tunnel kiln
small cross-section river-crossing tunnel
Tunnel Cross-section Area
tunnel cross-section form
tunnel section with unfavorable geological condition
Tunnel with Small Clear Space
TUNNEL WITH SMALL CLEAR SPACING
Tunnel with small spacing
Cross section with arbitrary shape