Abstract
Shallow underground structures are commonly built in close proximity to tall buildings in dense urban environments. Although it is well known that such buildings have the potential to affect ground motions in their vicinity and transmit significant forces and moments into their foundations and surrounding soil during earthquakes, their impacts on adjacent underground structures are not well understood. This study evaluates the impact of an adjacent midrise or high-rise building on the seismic response of a cut-and-cover tunnel structure and a braced excavation in centrifuge experiments and corresponding numerical simulations. The underground structures are first studied without buildings present, and then with an adjacent 13-story midrise or 42-story high-rise structure. Results indicate that adjacent buildings transmit large lateral loads to the underground structures during ground shaking and that the distribution of loading is nonlinear with depth. The loading is proportional to building base shear and is dependent upon the geometric details of both the underground structure and the building foundation. Numerical analyses are shown to reasonably reproduce the experimentally measured response of the structure–soil–underground structure system. For design purposes, these interactions must be accounted for, and the assumptions of free-field or isolated conditions are not appropriate for underground structures in urban settings.
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Acknowledgments
This work was supported by the National Science Foundation (NSF) under Grant No. 1134968. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. The authors also acknowledge the support of the staff and students at the University of Colorado Boulder and University of California, Davis centrifuge facilities.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 144 • Issue 12 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 4, 2017
Accepted: May 16, 2018
Published online: Oct 13, 2018
Published in print: Dec 1, 2018
Discussion open until: Mar 13, 2019
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