Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

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

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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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.