Diversion Tunnel with Small Section
Small Cross Section Tunnel
Large Cross Section Tunnel
tunnel section with unfavorable geological condition
Tunnel with Small Clear Space
Tunnel with small spacing
Cross section with arbitrary shape
nonstandard pressure vessels of rectangular cross section with round angles
Small Cross Section Rod Feeding
small cross section size
Angle of intersection of the exhausting duct orifice with tunnel axis
arcade tunnel with partial pressure
double-track railway tunnel with shallow cover
flood discharge tunnel with horizontal vertex flow
flood discharge tunnel with vertical vertex flow