Earth pressure balance (EPB) tunneling induced settlements in the Tren Urbano Project, Rio Piedras, Puerto Rico
Name
166269237-MIT.pdf
Description
Full printable version
Size
25.74 MB
Format
Adobe PDF
Checksum (MD5)
d9afd303bc1801dae97f5e839de8ad0c
Author(s)
Abrams, Alejandro J
Advisor(s)
Andrew J. Whittle.
Alternative Title
EPB tunneling induced settlements in the Tren Urbano Project, Rio Piedras, Puerto Rico
Date Issued
2007
Publisher
Massachusetts Institute of Technology
Abstract
Underground construction of the Rio Piedras section of the Tren Urbano project involved the construction of twin tunnels (6.3m diameter) with Earth Pressure Balance machines in weathered alluvial soil. The depth of the cover over the tunnel crown varies from 13m to 10m. The twin tunnels, which connect the Rio Piedras Station and University of Puerto Rico Station, each have a length of 433 meters. Precast concrete linings offered the final structural support. Ground deformations were monitored throughout the construction of both twin tunnels. Volume loss is defined as the volume of ground loss as a proportion of the final tunnel volume and is measured in the plane perpendicular to the tunnel heading. Volume losses corresponding to the process of tunnel construction are identified in this thesis. Settlement troughs both over single and twin tunnels (when symmetric) are often described by a Gaussian curve. However, previous studies have suggested that the settlement trough due to twin tunnels is not symmetric with respect to the midpoint between the two tunnels.
(cont.) The current research shows that the superposition methods proposed by Suwansawat and Einstein (2007) are able to describe the observed settlement trough of the two bored tunnels with volume losses ranging from 0.9 to 1.8% for each bore. These results are up to a factor of 2 larger than volume losses predicted by empirical methods based on overload factors (Macklin, 1999).
Description
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2007.
Includes bibliographical references (leaves 72-73).
Subjects
Civil and Environmental Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
Persistent DSpace Link
