Dynamic Testing to Predict Static Performance of Drilled Shafts Results of FHWA Research

by Clyde N. Baker, Jr., STS Consultants Ltd, Northbrook, United States,
Elliott E. Drumright, STS Consultants Ltd, Northbrook, United States,
Francis Mensah, STS Consultants Ltd, Northbrook, United States,
Gary Parikh, STS Consultants Ltd, Northbrook, United States,
Carl Ealy, STS Consultants Ltd, Northbrook, United States,



Document Type: Proceeding Paper

Part of: Geotechnical Engineering Congress—1991

Abstract: The paper describes the preliminary results of recent research sponsored by the FHWA on predicting by relatively economical dynamic methods, the static capacity and performance of drilled shafts constructed with and without planned defects. A total of eleven shafts were constructed at two sites with different soil profiles. Planned defects composed of sand bags attached to the rebar cages occupied from 0 to 50% of the shaft cross-section. Two instrumented shafts (with and without defects) were statically load tested (for correlation purposes), and then all eleven shafts were tested both dynamically and by an impact response procedure. A comparison of the test results is presented, with a discussion of the trends and anomalies apparent in the data.

Subject Headings: Shafts | Dynamic tests | Soil dynamics | Federal government | Defects and imperfections | Statics (mechanics) | Drilled shafts | Soil tests

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