Location
Arlington, Virginia
Date
14 Aug 2008, 7:00 pm - 8:30 pm
Abstract
This paper discusses the design, construction, and performance of the support of excavation system used at 300 New Jersey Avenue jobsite. The temporary support of excavation system is more complicated than the typical urban site in Washington D.C. and had to be adaptable to many different and variable conditions surrounding the site. These conditions included support of a six and seven story office building, WMATA’s Red Line Subway tunnel under D Street and the support of the 24 foot wide brick and stone Tiber Creek Sewer, which was built in the late 1800’s to drain a major portion of Washington, DC. The depth of the excavation is 60 feet and the top 30 feet is a mix of Miocene Age Terrace deposits of sand, gravel, silt, and clay. The bottom 30 feet is hard Cretaceous clay. The groundwater at the interface at the top of the clay was a concern due to the possibility of washing away the upper soils during installation of typical soldier beams and wood lagging. Therefore, we chose to use slurry wall clamming techniques to install Piles in Self Hardening Grout (PSHG) on two sides of the site and tangent/bracket piles on the side adjacent to the existing buildings. The bracing included tiebacks, corner braces, wales, rakers, and cross lot struts. In addition Pin Piles with support steel were installed to hold the existing utilities under First Street and a suspended platform over the excavation, for the excavator’s long stick backhoe.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
6th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2008 Missouri University of Science and Technology, 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
Ragsdale, Irvin and Wadia, Keki, "Temporary Support of Excavation System for 300 New Jersey Avenue" (2008). International Conference on Case Histories in Geotechnical Engineering. 7.
https://scholarsmine.mst.edu/icchge/6icchge/session08/7
Temporary Support of Excavation System for 300 New Jersey Avenue
Arlington, Virginia
This paper discusses the design, construction, and performance of the support of excavation system used at 300 New Jersey Avenue jobsite. The temporary support of excavation system is more complicated than the typical urban site in Washington D.C. and had to be adaptable to many different and variable conditions surrounding the site. These conditions included support of a six and seven story office building, WMATA’s Red Line Subway tunnel under D Street and the support of the 24 foot wide brick and stone Tiber Creek Sewer, which was built in the late 1800’s to drain a major portion of Washington, DC. The depth of the excavation is 60 feet and the top 30 feet is a mix of Miocene Age Terrace deposits of sand, gravel, silt, and clay. The bottom 30 feet is hard Cretaceous clay. The groundwater at the interface at the top of the clay was a concern due to the possibility of washing away the upper soils during installation of typical soldier beams and wood lagging. Therefore, we chose to use slurry wall clamming techniques to install Piles in Self Hardening Grout (PSHG) on two sides of the site and tangent/bracket piles on the side adjacent to the existing buildings. The bracing included tiebacks, corner braces, wales, rakers, and cross lot struts. In addition Pin Piles with support steel were installed to hold the existing utilities under First Street and a suspended platform over the excavation, for the excavator’s long stick backhoe.
