Tunneling
Due to the unique topography of the project area, which includes high desert regions of the Antelope Valley, high mountains of the San Gabriel Mountain range and dense urban areas of the San Fernando Valley, tunnels are utilized throughout the project section. These tunnels are used to address topographic constraints (high mountains), and avoid and reduce impacts to communities, habitat and facilities above (homes, freeways, etc.). With the complex geological conditions and fault zones within the tunneling areas, key considerations were accounted for in the design elements, such as type of tunnel, seismic fault chambers, access points, sound mitigation and safety. The approximate length of tunnels in the Palmdale to Burbank Project Section is 22 to 28 miles.
Kasama sa Preferred Alternative, SR14A, ang apat na tunnel na may kabuuang 28 milya.
Mga Uri ng Tunnel
![Gupitin at Takpan](https://meethsrsocal.org/wp-content/uploads/2022/07/Cut-and-Cover.png)
![Tunnel Boring Machine](https://meethsrsocal.org/wp-content/uploads/2022/07/Tunnel-Boring-Machine.png)
Tunnel Boring Machine Animation
Depth Maps
Paghahambing sa Pagitan ng mga Ruta
Ang talahanayang ito ay nagbibigay ng impormasyon tungkol sa bawat alternatibo mula sa Spruce Court sa Palmdale hanggang sa Burbank Station, kasama ang iba't ibang feature ng disenyo at haba ng segment ng tunnel.
![P-B Tunneling Table](https://meethsrsocal.org/wp-content/uploads/2024/06/P-B-Tunneling-Table.jpg)
Mga Halimbawa ng Portal
![Halimbawa ng Portal 1 Halimbawa ng Portal 1](https://meethsrsocal.org/wp-content/uploads/2021/05/Portal_Example2.png)
![Halimbawa ng Portal 2 Halimbawa ng Portal 2](https://meethsrsocal.org/wp-content/uploads/2021/05/Portal_Example4.png)