Two-Time Winner

by John Prendergast, Managing Editor; Civil Engineering Magazine, ASCE World Headquarters, 345 East 47th Street, New York City, NY.,

Serial Information: Civil Engineering—ASCE, 1993, Vol. 63, Issue 12, Pg. 46-49

Document Type: Feature article


After more than a century of service as a major U.S.-Canada rail link, the existing St. Clair River Tunnel between Port Huron, Mich. and Sarnia, Ontario is being replaced by a new tunnel large enough to fit the double-stack intermodel container cars seen as the future of freight transport. The $200 million (Canadian) project will be a shallow-bored tunnel constructed by an earth pressure balance tunnel boring machine (TBM) and will be 1,844 m long (of which 610 m will lie betneath the river), with an internal diameter of 8.4 m. In addition to constructing a large diameter tunnel in soft squeezing clay with limited cover, project challenges have included highly complex environmental and permitting requirements, development and implementation of an innovative contract process, and control of potential ground settlement of sensitive structures along the tunnel alignment.

Subject Headings: Tunnels | Soil settlement | Rail transportation | Railroad trains | Project management | Freight transportation | Structural settlement

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