Question: New Austrian Tunneling Method ( NATM ) has been well accepted in the world since the 1 9 7 0 s . Today, the principle

New Austrian Tunneling Method (NATM) has been well accepted in the world since the 1970s. Today, the principle of the NATM is well applied in the design and construction of a mined tunnel, especially in soft ground or weak rocks.
Question 3: Please present the definition and list the principles of the NATM, in terms of design and construction, respectively

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