Especially New Austrian Tunneling Method(NATM) construction has sometimes been adopted in highway tunnel project, which has been applied only 20 years in our country, and people are probing into and practicing it.

• 特别是高速公路隧道工程往往采用新奥法施工，其应用在我国仅仅二十来年的时间，人们对新奥法的认识，处于探索与实践中。