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Geotechnical and Construction Aspects of the Immersed Tube Tunnel in Boston Harbor

by David L. Druss, Bechtel/Parsons Brinckerhoff, Boston, United States,
Burton P. Kassap, Bechtel/Parsons Brinckerhoff, Boston, United States,



Document Type: Proceeding Paper

Part of: Preparing for Construction in the 21st Century

Abstract:

An immersed tube tunnel (ITT) approximately 3,850 feet in length will be constructed as a part of the Central Artery/Tunnel Interstate Highway Project located in Boston, Massachusetts. Geotechnical exploration for the tunnel consisted of geophysical methods and conventional test boring, which included oriented core sampling. The geotechnical explorations were focused primarily on defining the subbottom profile and obtaining engineering parameters for performing slope stability analyses for tunnel excavation through soil and rock. This paper will discuss the geology encountered, engineering properties of the soil and rock to be removed and the anticipated side slopes. It will further discuss and illustrate the proposed method of construction and its effect on the harbor environment.

Subject Headings: Tunnels | Infrastructure construction | Construction methods | Ports and harbors | Highways and roads | Geotechnical engineering | Excavation | Massachusetts | United States | Boston

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