Construction monitoring for the transbay transit center excavation in san francisco, California

Youssef M.A. Hashash, Mohamad Jammoul, Kaitlyn L. Fleming, Stephen McLandrich, Andrew Yeskoo, Nick O'Riordan, Pierre Gouvin, Michael Riemer

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Underground space development in large metropolitan areas has become a way to accommodate rapid population growth while sustaining and enhancing the quality of urban lifestyle. A common challenge to urban underground construction is in developing such a space in a heavily built environment with minimal impact on adjacent structures and limited disruption to economic activity. This challenge is exacerbated when soft-to-medium soil conditions are encountered. Hence, urban deep excavations are usually coupled with extensive instrumentation plans and continuous monitoring to evaluate performance and detect deviations from anticipated behavior. The massive transbay transit center (TTC) excavation in San Francisco is a unique excavation of unprecedented scale in soft soils characteristic to the Bay Area. It is approximately 1500 ft long, 85 ft wide, and 60 ft deep. Novel technologies were employed to support and enhance the construction control process and monitor ground deformations. This paper will highlight the key features of the field instrumentation program used for the TTC project along with a description of the developed and installed sensors. In addition, it will discuss the data storage and monitoring methods, including the display of construction progress and ground and building movements in a virtual reality environment. The evaluation of ground response to excavation activities will be the subject of future publications.

Original languageEnglish (US)
Title of host publicationIFCEE 2015 - Proceedings of the International Foundations Congress and Equipment Expo 2015
EditorsJ. Brian Anderson, Magued Iskander, Muhannad T. Suleiman, Debra F. Laefer
PublisherAmerican Society of Civil Engineers
Number of pages10
ISBN (Electronic)9780784479087
StatePublished - Jan 1 2015
EventInternational Foundations Congress and Equipment Expo 2015, IFCEE 2015 - San Antonio, United States
Duration: Mar 17 2015Mar 21 2015

Publication series

NameGeotechnical Special Publication
VolumeGSP 256
ISSN (Print)0895-0563


OtherInternational Foundations Congress and Equipment Expo 2015, IFCEE 2015
Country/TerritoryUnited States
CitySan Antonio

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology


Dive into the research topics of 'Construction monitoring for the transbay transit center excavation in san francisco, California'. Together they form a unique fingerprint.

Cite this