Use of Straight Shaft Piers as Settlement Reducers in Combined Footing Design over Chicago Soft Clay
Location
New York, New York
Date
14 Apr 2004, 4:30 pm - 6:30 pm
Abstract
The paper describes the design and construction history of a 10-story (with provision for two more stories) combination parking structure and office building cost effectively built over soft clay in Chicago, Illinois. The site profile consisting of medium dense to dense sand and sandy silt underlain by soft compressible clay to a very thin, sometimes non-existent, very stiff to hard clay layer underlain by water bearing very dense sandy silt to limestone bedrock made foundation design within the owner's budget difficult. The development of a unique combination of strip footings in the shallow, medium dense to dense sand layer combined with straight shaft piers under the columns and extended to the very dense sandy silt layer is described. The instrumentation program to determine the load distribution between strip footing and straight shaft pier is presented as well as the instrumentation monitoring during construction and for several years after construction. Observed settlement and load distribution is compared favorably to predicted settlement and load distribution.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 2004 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Baker, Clyde N. Jr.; Kiefer, Tony A.; and Saether, Kolbjorn, "Use of Straight Shaft Piers as Settlement Reducers in Combined Footing Design over Chicago Soft Clay" (2004). International Conference on Case Histories in Geotechnical Engineering. 36.
https://scholarsmine.mst.edu/icchge/5icchge/session01/36
Use of Straight Shaft Piers as Settlement Reducers in Combined Footing Design over Chicago Soft Clay
New York, New York
The paper describes the design and construction history of a 10-story (with provision for two more stories) combination parking structure and office building cost effectively built over soft clay in Chicago, Illinois. The site profile consisting of medium dense to dense sand and sandy silt underlain by soft compressible clay to a very thin, sometimes non-existent, very stiff to hard clay layer underlain by water bearing very dense sandy silt to limestone bedrock made foundation design within the owner's budget difficult. The development of a unique combination of strip footings in the shallow, medium dense to dense sand layer combined with straight shaft piers under the columns and extended to the very dense sandy silt layer is described. The instrumentation program to determine the load distribution between strip footing and straight shaft pier is presented as well as the instrumentation monitoring during construction and for several years after construction. Observed settlement and load distribution is compared favorably to predicted settlement and load distribution.
