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The purpose of this report is to document the issues related to the design and construction of driven pile foundations at the Central Artery/Tunnel project. Construction issues that are presented include pile heave and the heave of an adjacent building during pile driving. Mitigation measures, including the installation of wick drains and the use of preaugering, proved to be ineffective. The results of 15 dynamic and static load tests are also presented and suggest that the piles have more capacity than what they were designed for. The information presented in this report will be of interest to geotechnical engineers working with driven pile foundation systems.
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Technical Report Documentation Page
|1. Report No.
|2. Government Accession No.||3. Recipient's Catalog No.|
|4. Title and Subtitle
Design and Construction of Driven Pile Foundations– Lessons Learned on the Central Artery/Tunnel Project
|5. Report Date
|6. Performing Organization Code|
Aaron S. Bradshaw and Christopher D.P. Baxter
|8. Performing Organization Report No.|
|9. Performing Organization Name and Address
University of Rhode Island Narragansett, RI 02882
|10. Work Unit No.|
|11. Contract or Grant No.
|12. Sponsoring Agency Name and Address
Office of Infrastructure Research and Development Federal Highway Administration
6300 Georgetown Pike McLean, VA 22101-2296
|13. Type of Report and Period Covered
Final Report January 2003–August 2003
|14. Sponsoring Agency Code|
|15. Supplementary Notes
Contracting Officer's Technical Representative (COTR): Carl Ealy, HRDS-06
Five contracts from the Central Artery/Tunnel (CA/T) project in Boston, MA, were reviewed to document issues related to design and construction of driven pile foundations. Given the soft and compressible marine clays in the Boston area, driven pile foundations were selected to support specific structures, including retaining walls, abutments, roadway slabs, transition structures, and ramps. This report presents the results of a study to assess the lessons learned from pile driving on the CA/T. This study focused on an evaluation of static and dynamic load test data and a case study of significant movement of an adjacent building during pile driving. The load test results showed that the piles have more capacity than what they were designed for. At the site of significant movement of an adjacent building, installation of wick drains and preaugering to mitigate additional movement proved to be ineffective. Detailed settlement, inclinometer, and piezometer data are presented.
|17. Key Words
Driven piles, heave, CAPWAP, static load test, Boston tunnel
|18. Distribution Statement No restrictions.
This document is available to the public through the National Technical Information Service, Springfield, VA 22161.
|19. Security Classif. (of this report)
|20. Security Classif. (of this page)
|21. No. of Pages
Form DOT F 1700.7 (8-72) Reproduction of completed page authorized