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Assessment of shear strength from measuring while drilling shafts in Florida Limestone

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Authors:Rodgers, Michael; McVay, Michael; Horhota, David; Sinnreich, Jon; Hernando, Jose
Author Affiliations:Primary:
University of Florida, Herbert Wertheim College of Engineering, Engineering School of Sustainable Infrastructure and Environment, Gainesville, FL, United States
Other:
Florida Department of Transportation, United States
Volume Title:Canadian Geotechnical Journal Revue Canadienne de Géotechnique
Source:Canadian Geotechnical Journal = Revue Canadienne de Géotechnique, 56(6), p.662-674. Publisher: National Research Council of Canada, Ottawa, ON, Canada. ISSN: 0008-3674
Publication Date:2019
Note:In English. 25 refs.; illus., incl. 7 tables
Summary:The focus of this research is the real-time assessment of drilled shaft capacity based on the unconfined compressive strength (qu) obtained from measuring while drilling (MWD). Measures of qu, a function of rock strength commonly used in drilled shaft design, are provided through five monitored drilling parameters: torque, crowd, rotational speed, penetration rate, and bit diameter. Monitored shaft installations took place at three separate locations on drilled shafts, which were subsequently load tested. Using the qu values obtained from MWD, side shear was estimated in portions of each shaft where instrumented segments indicated the side shear was fully mobilized for direct comparison. To consider all of the current side shear equations used in Florida drilled shaft design, the estimation of tensile strength (qt) in real time was also needed. This led to a theoretical approach to establish the qt/qu relationship that was later verified empirically and provided new correlations between material and mechanical properties of Florida geomaterials. A comparative analysis indicated that the results from multiple established side shear equations, used with qu from MWD, align well with the results obtained from load testing. This suggests that estimating drilled shaft capacity from MWD is viable to reduce spatial uncertainty.
Subjects:Carbonate rocks; Compressive strength; Design; Drilling; Friction; Limestone; Mechanical properties; Rock mechanics; Sedimentary rocks; Shear strength; Site exploration; Tensile strength; Uniaxial tests; Florida; Miami-Dade County Florida; United States; Florida Limestone; Little River Bridge
Coordinates:N251000 N260000 W0800800 W0805400
Record ID:858370-5
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute.
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