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 s 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 : Please present the definition and list the principles of the NATM, in terms of design and construction, respectively
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