Feature Article
Feb 28, 2022
Building on Hudson Yards
Authors: Michael Paquette and Marc GallagherAuthor Affiliations
Abstract
As a young geotechnical consulting engineer working in New York City, I was always curious as to why the city's building code prescribed a maximum allowable rock-socket skin-friction value of 200 psi for caisson design (rock-socketed drilled shaft with permanent casing) and left little evaluation of the rock to the geotechnical engineer. Generally, the caisson design process in NYC involves drilling boreholes and coring rock, establishing where the “good” rock begins, and then designing using 200 psi. Often, not much more evaluation of the rock goes into the design. The entire industry uses 200 psi — and that's just the way it is.
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Information
Published In
GeoStrata Magazine Archive
Volume 25 • Issue 6 • December 2021
Pages: 24 - 31
Copyright
© 2021 American Society of Civil Engineers.
History
Published in print: Dec 2021
Published online: Feb 28, 2022
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Authors
Affiliations
Michael Paquette
P.E.
Senior Project Manager, Langan Engineering & Environmental Services; New York, NY
Marc Gallagher
P.E.
Senior Principal, Langan Engineering & Environmental Services; New York, NY
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.