United States Department of Transportation
i
Assessing Axial Capacities of Auger Cast Piles from Measuring While Drilling
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2021-12-01
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[PDF-12.80 MB]
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Edition:Final Report 11/01/2019 – 02/28/2022
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Abstract:This report focuses on the development of measuring while drilling (MWD) QA/QC procedures for South Florida auger cast-in-place (ACIP) piles, socketed into Florida limestone. The research first involved developing two MWD ACIP pile analysis spreadsheets that were used for QA/QC purposes during the installation of ACIP piles in South Florida. The first spreadsheet assessed the quality of ACIP piles using specific energy and total energy obtained from MWD. The second spreadsheet assessed the quality of ACIP piles using specific energy, unconfined compression strength, pile side shear, and pile capacity obtained from MWD. It was found that the MWD data compared well with SPT data, rock core data, and pile load test data obtained at three South Florida sites. Furthermore, modeled piles using the MWD data displayed the same behavior as the load-tested piles at the sites, which further validated the developed methods. Once the spreadsheet and methods were established, fifty production piles were analyzed to assess the QA/QC procedure developed. In addition to the development of ACIP pile MWD methods and procedures, LRFD analyses also took place that included design methods that utilized SPT data, conventional rock core data, and MWD data. It was found that the SPT methods produced the lowest resistance factor (φ) values, the conventional rock core data produced the second lowest φ values, MWD simulated rock coring produced the second highest φ values, and MWD conducted in the footprint of the ACIP piles (QA/QC procedure) produced the highest φ values. This was attributed to MWD eliminating spatial variability by monitoring the drilling process in the footprint of the piles. In conclusion, it was determined that MWD is viable to provide superior ACIP pile QA/QC.
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