Complex High-Rise Foundation Design and Constructionby Clyde N. Baker, Jr., STS Consultants Ltd, United States,
Stephen A. Bucher, STS Consultants Ltd, United States,
William F. Baker, Jr., STS Consultants Ltd, United States,
Abstract: The substructure design and construction of a 60 story office tower in downtown Chicago is described. The presence of existing belled caissons on hardpan required use of filtered dewatering wells to lower the water table well into the very dense underlying silt and sand to permit new bell construction underneath the old caissons. Maximum allowable bearing pressure on the very dense silt and sand layer of 50 ksf (2395 kN/m2) was evaluated using in-situ pressuremeter testing. Predicted settlements compared favorably with actual settlements.
Subject Headings: Foundation design | Foundation construction | Construction management | Caissons | Soil pressure | Foundation settlement | Silt | Soil water | Wells (water) | Substructures | North America | Illinois | United States | Chicago
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