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据不完全资料统计,我国已建成公路隧道1208座,总里程362公里。这些隧道在降低交通事故发生率,缩短行车距离,提高车速,保护环境,促进经济发展,提高群众生活水平等方面发挥了积极作用,取得了良好的社会经济效益。随着公路向山区延伸,隧道修建规模越来越大,单洞长度越来越长,修建技术与营运技术日趋复杂。如正在施工中的福建美菰岭隧道(5300米×2),正在设计中的湖南雪峰
According to incomplete statistics, China has built 1208 highway tunnels with a total mileage of 362 kilometers. These tunnels have played a positive role in reducing the incidence of traffic accidents, shortening the distance traveled, speeding up the roads, protecting the environment, promoting economic development, and raising the living standards of the masses. These tunnels have achieved good social and economic benefits. With the extension of roads to mountainous areas, the scale of tunnel construction is getting larger and larger, the length of single holes is getting longer and longer, and the construction technology and operation technology are increasingly complicated. As is the construction of the United States Meiling tunnel (5300 m × 2), is being designed Hunan Xuefeng