United States Department of Transportation
i
Dynamic Pile Monitoring Report Proposed I-215 Bridges Salt Lake City, Utah
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1985-05-01
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[PDF-1.36 MB]
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Abstract:Field demonstrations for Demonstration Project 66, "Design and Construction of Driven Pile Foundations," include (1) dynamic pile monitoring by pile analyzer (field computer), and (2) static pile load testing using a mobile pile load test frame. The equipment and technical assistance are made available to a requesting State highway department. A request for a field demonstration and use of the dynamic testing equipment was received from the Utah Department of Transportation (UDOT) in September 1984. UDOT had decided to perform a comprehensive design stage pile load test program for the proposed I-215 bridges in Salt Lake City. The Federal Highway Administration (FHWA) agreed to provide the dynamic monitoring equipment and personnel to operate the equipment. The FHWA also provided technical assistance for performing wave equation analysis. UDOT decided to use its own pile load test frame for performing static pile load tests. The purpose for the load test program was; (1) to demonstrate the use of newer and more accurate techniques for determining pile load capacity during driving, (2) to verify the predictions made by the newer techniques by performing static load tests, and (3) to determine design pile load capacities for I-215 bridges. It was felt that cost savings could be achieved by using either higher design loads or shorter pile lengths. The field work (pile driving and dynamic testing) was performed over a period of 4 weeks during March and April 1985. The dynamic tests were performed oy Mr. H. Clark, Civil Engineering Technician, in the Demonstrations Projects Division, and Mr. S. Vanikar, Geotechnical Engineer in the Geotechnical and Materials Branch. The UDOT personnel performed static pile analysis and wave equation analysis. The piling contractor was W. P. Harlin Construction Co. At the time of writing this report, the static load tests on eight test piles at four test sites were incomplete. Therefore, the static load test data is not included in this report. The wave equation analyses for test piles were performed by UDOT and those results are not included in the report. On March 29, 1985, after the dynamic testing for piles at the first two test sites was completed, an informal presentation on the results of the analysis and preliminary recommendations were made to the UDOT and FHWA engineers. A detailed description of the work performed, test results, and recommendations follow in this report.
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