Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

Faced with difficult soil conditions for the support of two 6-story office towers in Dublin, CA and of a 6-story parking garage in Sacramento, CA, engineers recommended the use of Geopier Rammed Aggregate Piers to reinforce the soil for the support of high bearing capacity spread footings instead of deep foundations. Foundation selection for both sites was influenced by long-term settlement performance, schedule and cost savings, and seismic uplift resistance. Rammed aggregate piers were installed to strengthen upper weak and compressible soil layers resulting in a substantially stiffer soil layer on which shallow, high bearing capacity spread footings were constructed. Several rammed aggregate piers were also installed with steel anchors to resist seismically induced overturning forces. Design parameter values were confirmed by full scale aggregate pier modulus tests and uplift tests and a 24 hour load test at the Dublin site. Total settlements were estimated to be less than 1½ inches for the Sacramento site and less than 1 inch for the Dublin site. Measured settlements are less than 1 inches total for both projects with differential settlements less than ½ inches, confirming the design approaches and soil properties used for design. Site selection, rammed aggregate pier design methodology, modulus and uplift load test results, and measured settlement performance are presented for two projects in California.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Settlement of Shallow Foundations Constructed over Reinforced Soil: Design Estimates vs. Measurements

New York, New York

Faced with difficult soil conditions for the support of two 6-story office towers in Dublin, CA and of a 6-story parking garage in Sacramento, CA, engineers recommended the use of Geopier Rammed Aggregate Piers to reinforce the soil for the support of high bearing capacity spread footings instead of deep foundations. Foundation selection for both sites was influenced by long-term settlement performance, schedule and cost savings, and seismic uplift resistance. Rammed aggregate piers were installed to strengthen upper weak and compressible soil layers resulting in a substantially stiffer soil layer on which shallow, high bearing capacity spread footings were constructed. Several rammed aggregate piers were also installed with steel anchors to resist seismically induced overturning forces. Design parameter values were confirmed by full scale aggregate pier modulus tests and uplift tests and a 24 hour load test at the Dublin site. Total settlements were estimated to be less than 1½ inches for the Sacramento site and less than 1 inch for the Dublin site. Measured settlements are less than 1 inches total for both projects with differential settlements less than ½ inches, confirming the design approaches and soil properties used for design. Site selection, rammed aggregate pier design methodology, modulus and uplift load test results, and measured settlement performance are presented for two projects in California.