Permanent Structure as Part of the Underpinning System for Boston's Central Arteryby Istvan Steven Varga, Weidlinger Assocs Inc, Cambridge, United States,
Abstract: The Central Artery, a major six lane structural steel viaduct, has been one of Boston's most significant roadways over the past three decades. Increasing congestion, accidents, a variety of environmental considerations, and the city's increasingly scarce real estate, however, have caused this elevated highway to become obsolete. The city, state, and federal agencies have responded to these changing needs by proposing to reconstruct the Central Artery below grade in a major tunnel, thereby increasing highway safety and expanding its capacity to eight lanes. The proposed tunnel requires a massive excavation in fill clay and glacial till, varying in depth from 30 to 80 feet and in width from 100 to 200 feet. As an integral part of the proposed highway complex, additional ramps, bridges, and tunnels also need to be constructed.
Subject Headings: Tunnels | Highway bridges | Underpinning | Bridge foundations | Highways and roads | Traffic accidents | Fills | Excavation | Clays | Boston | North America | Massachusetts | United States
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