How to portal develop in Natm Method?

Question

Accepted Answer

Portal development in NATM method involves creating a temporary support system for the excavation process.

Portal development is a crucial step in NATM method as it involves creating a safe and stable opening for excavation.
The process involves creating a temporary support system using steel arches, shotcrete, and rock bolts.
The support system is designed to withstand the initial stresses and strains of the excavation process.
The portal is then excavated using drilling and blasting techniques.
Once the portal is complete, the support system is removed and the excavation process continues.
Proper portal development is essential for ensuring the safety of workers and the success of the excavation project.

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