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Stiffness reduction in soft Chicago clay during deep urban excavations

Authors
Jung, Y.-H.Kim, T.
Issue Date
2014
Publisher
Taylor and Francis - Balkema
Citation
Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 8th Int. Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, TC204 ISSMGE - IS-SEOUL 2014, pp.287 - 291
Journal Title
Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 8th Int. Symposium on Geotechnical Aspects of Underground Construction in Soft Ground, TC204 ISSMGE - IS-SEOUL 2014
Start Page
287
End Page
291
URI
https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/16455
DOI
10.1201/b17240-53
ISSN
0000-0000
Abstract
The nonlinearity and anisotropy are two key issues in evaluating the soil stiffness for the precise prediction of the displacement. Recent studies on the stress-strain behavior of Chicago clay, especially focused on the responses at small-strains, reveal the pattern of nonlinear stiffness degradation as the clay is stressed. Herein, we attempt to apply these observational responses of Chicago clay to an excavation problem. The finite element simulation of the excavation in the downtown Chicago area was conducted. At some observation locations, the simulations yield typical stress paths. Changes in nonlinearity and anisotropy were discussed by comparing computed and experimental stress paths. Even in the first few excavations, the reduction of shear stiffness could be significant in soft Chicago clay. © 2014 Korean Geotechnical Society.
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