Abstract
Ground movements observed during foundation installation and basement construction of a residential 53-story RC tower are presented. The One Museum Park West building is located in Chicago, Illinois, and was developed using a combination of bottom-up methods, used for the construction of a central concrete core of the building, and top-down methods to build five levels of basements. The excavation extended 13–15 m below grade and was made through soft to medium-stiff clays. The building was supported by drilled shafts and a perimeter wall formed by secant piles that transitioned to tangent piles below the bottom of the cut. The system was laterally braced with RC floor slabs structurally connected to the secant pile walls and the RC core. Field performance data were collected by means of settlement points and inclinometers located close to the walls on two sides of the excavation. The construction sequence and attendant ground movements during each main activity are summarized. As much as 160 mm of settlement was recorded in the adjacent streets throughout construction. Wall and foundation installation accounted for approximately 35% of the total settlements during construction, whereas top-down construction of the basement resulted in approximately 40% of the total settlements. These data emphasize the importance of considering all construction activities when making predictions of ground movements adjacent to deep supported excavations.
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Acknowledgments
Financial support for this work was provided by National Science Foundation Grant No. CMMI-0928184 and the Infrastructure Technology Institute of Northwestern University. The support of Dr. Richard Fragaszy, program director at the National Science Foundation, is greatly appreciated.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 141 • Issue 1 • January 2015
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© 2014 American Society of Civil Engineers.
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Received: Nov 7, 2013
Accepted: Aug 16, 2014
Published online: Sep 11, 2014
Published in print: Jan 1, 2015
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