U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| Project Information | ||
| Project ID: | FHWA-PROJ-14-0009 | |
| Project Name: | Downdrag on Continuous Flight Auger (CFA) Piles Due To Liquefaction | |
| Project Status: | Active | |
| Start Date: | March 12, 2014 | |
| End Date: | November 28, 2014 | |
| Contact Information | ||
| Last Name: | Nicks | |
| First Name: | Jennifer E | |
| Telephone: | 202-493-3075 | |
| E-mail: | jennifer.nicks@dot.gov | |
| Office: | Office of Infrastructure Research and Development | |
| Team: | Bridge and Foundation Engineering Team [HRDI-40] | |
| Program: | Innovative Bridge Research and Deployment | |
| Project detail | ||
| Roadmap/Focus area(s): | Infrastructure Research and Technology Strategic Plan and Roadmap | |
| Project Description: | The supplemental funding will support the continuation, data analysis, and documentation of additional field testing of continuous flight auger (CFA) pile downdrag in liquefaction conditions by Brigham Young University. The additional field testing includes axially loading the piles and blasting the site to represent pore pressure generation and dissipation due to liquefaction. Two reports will be developed as a result of this research, including an overview of the testing and an evaluation of methods to estimate downdrag due to liquefaction. | |
| Goals: |
The primary objective of this contract is to team up with Brigham Young University (funding also through National Science Foundation and Pacific Earthquake Engineering Research) to utilize three instrumented 0.6-meter diameter continuous flight auger (CFA) piles installed at a Christchurch, New Zealand test site to perform load tests before, during, and after blast-induced liquefaction. These tests will be used to:
(1) Measure the variation of skin friction on piles during and after soil liquefaction.
(2) Measure pile settlement, soil settlement, and negative friction with the liquefaction zone in different positions relative to the neutral plane.
(3) Assess the accuracy of various design approaches for predicting liquefaction-induced pile settlement.
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| Background Information: | Testing of unloaded piles by Brigham Young University (BYU), under the management of Dr. Kyle Rollins, was performed in Fall 2013 using funding provided by the National Science Foundation (NSF). These results are preliminary and more detailed data reduction and analysis is currently underway by BYU as part of the NSF grant. In addition, the Pacific Earthquake Engineering Research (PEER) Center and Utah DOT are supporting the project. Supplemental testing with surface load applied to the piles is also needed. | |
| Product Type: | Research report | |
| Test Methodology: | Field testing | |
| Expected Benefits: | More accurate design approaches for predicting liquefaction induced continuous flight auger pile settlement. | |
| Deliverables: | Name: Two reports will be developed as a result of this research, including an overview of the testing and an evaluation of methods to estimate downdrag due to liquefaction Product Type(s): Research report Description: Research reports. | |
| FHWA Topics: | Roads and Bridges--Geotechnical | |
| TRT Terms: | Design Testing Infrastructure Bridges Research Liquefaction |
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| FHWA Disciplines: | Geotechnical Structures |
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| Subject Areas: | Bridges and other structures Construction Design Geotechnology Research |
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