A New Combined Footing and Drilled Shaft Foundation Design

by Clyde N. Baker, Jr., STS Consultants Ltd, United States,
Elliott E. Drumright, STS Consultants Ltd, United States,
Martin J. Sterr, STS Consultants Ltd, United States,
John E. Benson, STS Consultants Ltd, United States,



Document Type: Proceeding Paper

Part of: Foundation Engineering: Current Principles and Practices

Abstract:

A conventional belled caisson foundation installation in glacial till to support a suburban Chicago 10-story office building was stopped when test caissons revealed excessive water-bearing sand strata in the anticipated beling zone. Design values were determined by in-situ pressuremeter testing and by a full-scale load test of a drilled shaft. Instrumentation consisting of two pressure cells beneath the upper shaft and Carlson strain gauges at several levels along the lower shaft was installed in a production shaft to monitor the manner in which the load was transmitted to the ground. Data is presented and compared with the design assumptions.

Subject Headings: Load tests | Shafts | Load factors | Load bearing capacity | Foundation design | Caissons | Building design

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