Three-Dimensional Responses of a Tied-Back Excavation through Clay
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Volume 131, Issue 3
Abstract
The three-dimensional ground deformations measured during construction of a deep tiedback excavation in Chicago are presented. The excavation was supported by a PZ-27 sheet pile wall and three levels of regroutable ground anchors. The excavation was made through granular soils into soft to medium stiff clays. Extensive field performance data were collected including lateral and vertical optical survey data and lateral inclinometer data. Construction procedures are summarized and correlated with monitoring data. The three dimensional pattern of ground surface deformations around the excavation is summarized. A performance-based relation to estimate the maximum horizontal ground movements for flexible wall systems as a function of factor of safety against basal heave and excavation depth is proposed. An empirical approach to estimate the distribution of ground movements parallel to a supported wall is presented.
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Acknowledgments
Inclinometer data were obtained by Construction Testing & Instruments, Inc., vibration-monitoring data were obtained by STS Consultants, Ltd., and Professionals Associated obtained the vertical and lateral survey data. Turner Construction Company was the general contractor and Case Foundation Company was the excavation support subcontractor. The help and interest of Dr. Jerry Parola and Ms. Dhooli Raj of Case and Mr. Ron McAllister of Turner made this work possible. Dr. Safdar Gill of Ground Engineering, Inc. designed the excavation support system for Case. Mr. John Brzezinski and Ms. Jo LeMieux-Murphy of the Facility Management group at Northwestern provided access to the project and were very helpful throughout its duration. Northwestern University students who generously gave their time to assist in the field monitoring effort included Frank Voss, Tanner Blackburn, Terry Holman, and Kristin Molnar. Financial support for this work was provided in part by National Science Foundation Grant Nos. CMS-0115213 and CMS-0219123. The support of Dr. Richard Fragaszy, program manager of Geomechanics and Geotechnical Systems, is greatly appreciated. The writers thank the anonymous reviewers for their careful review of the manuscript and useful comments.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 131 • Issue 3 • March 2005
Pages: 273 - 282
Copyright
© 2005 ASCE.
History
Received: Nov 7, 2003
Accepted: Jun 7, 2004
Published online: Mar 1, 2005
Published in print: Mar 2005
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