What is the wing wall entrance of the tunnel like, is there?

Wing-wall portal is formed by adding wing wall to the side of the end wall to support the end wall and copy and protect the stability of cutting slope, which is suitable for portal with poor geological conditions; The top surface of the wing wall is consistent with the extension surface of the uphill slope, and a drainage ditch is set on it to discharge the surface water collected from the uphill slope and roof into the cutting side ditch.

Other portal types:

End wall entrance

End-wall portal, commonly known as one-word portal, is the longest-used portal type, which is suitable for surrounding rocks with steep natural slope, stable rock mass and open terrain.

Zhudongmen

Column door is developed from end-wall door, which is actually a kind of end-wall door.

Stepped entrance

At the entrance of the tunnel near the mountain, the cross slope of the ground is very steep. In order to adapt to the terrain and reduce excavation, stepped holes are often used.

Extended data:

Tunnel classification:

1, according to tunnel geological conditions: soil tunnel and rock tunnel.

2. According to the tunnel length: short tunnel (railway tunnel regulation: L ≤ 500m; Provisions for highway tunnels: L≤500m), medium and long tunnels (provisions for railway tunnels: 500)

3. According to the ITA definition, the criteria for dividing the tunnel cross-sectional area are: extremely small-section tunnel (2 ~ 3 _), small-section tunnel (3 ~ 10 _), medium-section tunnel (10 ~ 50 _) and large-section tunnel (50 ~ 100_).

4. According to the location of tunnels: mountain tunnels, underwater tunnels and urban tunnels.

5. According to the buried depth of the tunnel: shallow buried tunnel and deep buried tunnel.