Soft Ground Tunneling of the Greenbelt Tunnelsby J. Marshall Dean, Mergentime Corp, Flemington, NJ, USA,
Abstract: Mergentime/Loram's contract for the construction of Section E-1d Greenbelt Route Tunnels includes construction of dual 1,770-foot tunnels in soft ground, a crossover structure, a fan structure and pumping station, and other related work. This presentation describes the overall construction requirements of the Contract, including subsurface conditions; Mergentime's value engineering of the tunneling and compressed air contract requirement; selection of the tunnel boring machine; installation and use of the compressed air plant including the man, muck and medical locks; the use of precast concrete tunnel liners; and the tunneling performances during construction of the tunnels.
Subject Headings: Soft soils | Construction equipment | Tunneling | Precast concrete | Value engineering | Contracts | Concrete construction
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