Use of Pressuremeter in Mixed Highrise Foundation Design

by Clyde N. Baker, Jr., STS Consultants Ltd, Northbrook, United States,



Document Type: Proceeding Paper

Part of: Design and Performance of Deep Foundations: Piles and Piers in Soil and Soft Rock

Abstract:

The pressuremeter has been used extensively for the evaluation of strength and deformation characteristics of the glacial hardpan soils in the design and construction of caisson foundations in Chicago over the last 25 years. The ability to predict deformation properties has permitted economical use of mixed foundation support for 50 to 60 story highrise buildings where the heavily loaded core is supported on rock and the lighter loaded perimeter is supported on hardpan. In some cases, it has been possible to support the core also on the hardpan with high bearing pressures (30 to 50 ksf) with acceptable differential settlement. Three case histories are presented to illustrate the procedure followed and the project and site conditions that led to different final solutions. Where data is available, predicted settlement is compared to observed settlement.

Subject Headings: Foundation design | Soil deformation | Foundation settlement | Measuring instruments | High-rise buildings | Foundation construction | Structural settlement | Chicago | Illinois | United States

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