Urban Tunnels—An Option for the Transit Crisis

by Matt S. Walton, Dir.; Minnesota Geological Survey, St. Paul, Minn.; formerly, Consultant, Englewood, Colo.,
Richard J. Proctor, Engrg. Geologist; Arcadia, Calif.,

Serial Information: Transportation Engineering Journal of ASCE, 1976, Vol. 102, Issue 4, Pg. 715-726

Document Type: Journal Paper


There has been no fundamental modification of the basic system of subway construction in the United States since the first subways were built in the 19th century. Excavation equipment and methods have been vastly improved, but subway system design and the basic construction sequence and procedure remain the same. New high-speed boring machine technology in suitable subsurface geologic conditions can introduce radical economies and reduce environmental impacts, if transit planners are aware of construction processes that include the economies of boring machine excavation. New approaches to subway construction are examined.

Subject Headings: Construction equipment | Subways | Urban areas | Transportation management | Construction management | Excavation | Professional societies | Subsurface environment | United States

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