一、前言近些年来,高等级公路在我国迅速发展,它要求路面宽敞,路线顺直,在穿越山区时,就需要开凿隧道;在城市的近郊和市区,也常以隧道来避免平面交叉和穿过江河.目前,地下工程施工的“新奥法”(NATM)已广泛应用.近期作者主持了《七道梁双车道公路隧道 I. Introduction In recent years, the rapid development of high-grade highways in our country requires that the road be spacious and straightforward. Tunnels must be drilled when crossing the mountainous areas. Tunnels are often used to avoid crossings in the suburbs and urban areas of cities And through the river.Now, the construction of the underground construction of the “New Austrian Law” (NATM) has been widely used.Recently the author presided over the "seven beam two-lane highway tunnel