Location
New York, New York
Date
16 Apr 2004, 8:00am - 9:30am
Abstract
The jacking of the largest concrete tunnels ever built in the United States required the construction of jacking pits of unusual dimensions and requirements. The location of the pits posed the additional challenge of difficult ground conditions, since the bottom of the pits was in the Boston blue clay. The pits had to have an unsupported span of over 40 feet to accommodate the dimensions of the tunnel, have a solid base to carry the weight of the sections being built and provide lateral resistance to the thrust of the jacks. Treviicos met those challenges by constructing a four feet thick, post-tensioned slurry walls capable of spanning 55 feet without intermediate support and by creating a thirty feet thick jet grouted mass below the sub-grade which had the double function of contrasting the wall at its toe as well as providing a more competent foundation for the jacking operation.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 2004 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
di Cervia, Arturo Ressi, "Jacking Pits in Boston’s Central Artery Project" (2004). International Conference on Case Histories in Geotechnical Engineering. 6.
https://scholarsmine.mst.edu/icchge/5icchge/session05/6
Jacking Pits in Boston’s Central Artery Project
New York, New York
The jacking of the largest concrete tunnels ever built in the United States required the construction of jacking pits of unusual dimensions and requirements. The location of the pits posed the additional challenge of difficult ground conditions, since the bottom of the pits was in the Boston blue clay. The pits had to have an unsupported span of over 40 feet to accommodate the dimensions of the tunnel, have a solid base to carry the weight of the sections being built and provide lateral resistance to the thrust of the jacks. Treviicos met those challenges by constructing a four feet thick, post-tensioned slurry walls capable of spanning 55 feet without intermediate support and by creating a thirty feet thick jet grouted mass below the sub-grade which had the double function of contrasting the wall at its toe as well as providing a more competent foundation for the jacking operation.
