dia of 2lane NATM Tunnel

Question

Accepted Answer

The diameter of a 2-lane NATM tunnel varies depending on the specific project requirements and regulations.

The diameter of a 2-lane NATM tunnel typically ranges from 10 to 15 meters.
The specific diameter will be determined by factors such as traffic volume, ventilation requirements, and geological conditions.
For example, a tunnel in a densely populated urban area may have a smaller diameter to minimize surface disruption, while a tunnel in a mountainous region may have a larger diameter to accommodate larger vehicles.
Consulting relevant design codes and guidelines is essential to determine the appropriate diameter for a 2-lane NATM tunnel.