Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

The East Side Access (ESA) Project to connect the Long Island Railroad to New York’s Grand Central Terminal in Manhattan will be one of the largest tunneling projects ever undertaken in New York. The Manhattan segment of the project includes a series of tunnels and caverns that will be excavated in rock to connect the existing 63rd Street tunnels to twin three-level station caverns beneath Grand Central Terminal, accommodating eight tracks and four platforms. A comprehensive geotechnical investigation program has been conducted and the data has been analyzed to develop a geological model along the tunnel route and rock mass mechanical properties have predicted to evaluate TBM performance and tunnel stability along the alignment. Along with the geological uncertainties associated with TBM tunneling, there are operational complexities that must be incorporated in TBM tunneling in Manhattan. Given the dearth of available real estate in Manhattan and with a view toward minimizing community impact, the TBM components must be lowered to the tunnel level from a shaft in Queens, transported through the existing 63rd Street tunnels to Manhattan, where a chamber will be built to assemble the TBMs. Furthermore, after the TBMs have excavated the first two tunnels, they must be reversed through these tunnels, re-assembled at two chambers constructed for this purpose, and re-launched to bore two other tunnels. This paper presents the geotechnical and physical challenges the project faces and the progressive engineering approach used to address these problems.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Rock Tunnelling with TBMs on the East Side Access Project a New Perspective

New York, New York

The East Side Access (ESA) Project to connect the Long Island Railroad to New York’s Grand Central Terminal in Manhattan will be one of the largest tunneling projects ever undertaken in New York. The Manhattan segment of the project includes a series of tunnels and caverns that will be excavated in rock to connect the existing 63rd Street tunnels to twin three-level station caverns beneath Grand Central Terminal, accommodating eight tracks and four platforms. A comprehensive geotechnical investigation program has been conducted and the data has been analyzed to develop a geological model along the tunnel route and rock mass mechanical properties have predicted to evaluate TBM performance and tunnel stability along the alignment. Along with the geological uncertainties associated with TBM tunneling, there are operational complexities that must be incorporated in TBM tunneling in Manhattan. Given the dearth of available real estate in Manhattan and with a view toward minimizing community impact, the TBM components must be lowered to the tunnel level from a shaft in Queens, transported through the existing 63rd Street tunnels to Manhattan, where a chamber will be built to assemble the TBMs. Furthermore, after the TBMs have excavated the first two tunnels, they must be reversed through these tunnels, re-assembled at two chambers constructed for this purpose, and re-launched to bore two other tunnels. This paper presents the geotechnical and physical challenges the project faces and the progressive engineering approach used to address these problems.