asymmetric tunnel barrier

one-dimensional tunnel barrier

diversion tunnel and spillway tunnel

option of separate highway tunnel and Metro tunnel

Part-tunnel and Part-roadbed Type Tunnel

power tunnel and tailrace tunnel system

railway tunnel under crossing the highway tunnel

Shield Tunnel and Rock Tunnel

water tunnel and salt tunnel

barrier-layer cell (= barrier-layer photo cell)

’South bridge and north tunnel’ option

1600℃ energy-saving gas tunnel kiln

2nd route tunnel

3D monitoring of tunnel slope deformation

3D tunnel

3-track railway tunnel

4-lane road tunnel

6 to 4 tunnel

a little spacing tunnel