Deformation Monitoring at the Central Artery / Tunnel (CA/T) Project in Boston, MA Axum Design Corp. Boston, Massachusetts ICCEMCE-03, International Conference on Earthquake Engineering, Computational Mechanics, Geotechnical and Transportation Engineering Addis Ababa, Ethiopia - January 9-10, 2003. The CA/T is the largest public works project in the USA. It has required extensive tunneling (Big-Dig) in the very highly built up area of Boston. Even tough the total Highway mileage of the project is not more than 8 miles yet it has been one of the most challenging civil engineering projects. With an excavation estimate of 16 million cubic yards of soil and laying of over 3.5 million cubic yards of concrete, its impact on the soil strata and foundations of the existing structures of the building is immense. Existing structures in the vicinity of the project are being monitored for any vertical and horizontal deformations. This paper describes the procedures that was used and the authors involvement in the gathering and processing of deformation data. Some of the aspects of the monitoring process include:
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